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Yes! For the record I have 3 Compac F USB miners and an Arctic USB fan running on a single ICONE USB 2.0 120W HUB.
I couldn't get a 4th to run on the ICONE hub and keep the other 3 plugging away at the higher speeds unfortunately.
Each of the 3 Compac F's does appear to be getting fed up to 3A per unit without tripping up or faltering.
I did buy a used GekkoScience USB hub and 2 Compac F's from Ebay this past week so I will try to load it up with a bunch of Compac F miners and see how it goes....
I do have 3 x SiPolar hubs that can't seem to handle even 2 Compac F's above 2.5A so I am happy to replace hopefully all of them!
I couldn't get a 4th to run on the ICONE hub and keep the other 3 plugging away at the higher speeds unfortunately.
Each of the 3 Compac F's does appear to be getting fed up to 3A per unit without tripping up or faltering.
I did buy a used GekkoScience USB hub and 2 Compac F's from Ebay this past week so I will try to load it up with a bunch of Compac F miners and see how it goes....
I do have 3 x SiPolar hubs that can't seem to handle even 2 Compac F's above 2.5A so I am happy to replace hopefully all of them!
Im not sure what you mean but i use 5x sipolars 120w hubs,all populated same way with 3Fs & a fan on each hub and all running btween 525Mhz to 600Mhz. that i believe is a power range of 2.7A to 3.3A. I havent perfected the art of tunning them all to run at same freq so i left them to run that way for now..
My observation is.. Even Sipolar has a fake.. while i was shopping for sipolar hub i noticed the fake one from the real , they called it Sip0lar - where the o was replaced with numeric zero -0. so i went straight to the source to order , which means goin back all d way to china.
Unless my results below doesnt count .. I stand corrected.
Code:
[U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
0: GSF 10050577: BM1397:01+ 525.00MHz T:525 P:525 (24:12) | 100% WU:100% | 346.9G / 348.8Gh/s WU:4872.2/m
1: GSF 10050582: BM1397:01+ 490.00MHz T:490 P:490 (26:13) | 100% WU:100% | 352.0G / 346.3Gh/s WU:4837.5/m
2: GSF 10050580: BM1397:01+ 585.00MHz T:585 P:585 (22:11) | 100% WU:100% | 374.1G / 377.8Gh/s WU:5278.3/m
3: GSF 10050558: BM1397:01+ 530.00MHz T:530 P:530 (24:12) | 100% WU:100% | 315.2G / 379.7Gh/s WU:5303.8/m
4: GSF 10050552: BM1397:01+ 540.00MHz T:540 P:540 (23:12) | 100% WU:100% | 324.5G / 362.8Gh/s WU:5068.5/m
5: GSF 10050555: BM1397:01+ 585.00MHz T:585 P:585 (22:11) | 100% WU:100% | 412.8G / 387.0Gh/s WU:5406.5/m
6: GSF 10050666: BM1397:01+ 600.00MHz T:600 P:599 (21:11) | 100% WU:100% | 393.5G / 382.0Gh/s WU:5337.0/m
7: GSF 10050664: BM1397:01+ 530.00MHz T:530 P:529 (24:12) | 100% WU:100% | 387.6G / 350.1Gh/s WU:4890.9/m
8: GSF 10050663: BM1397:01+ 600.00MHz T:600 P:600 (21:11) | 100% WU:100% | 349.0G / 395.3Gh/s WU:5522.5/m
9: GSF 10050451: BM1397:01+ 505.00MHz T:505 P:505 (25:13) | 100% WU:100% | 384.2G / 333.4Gh/s WU:4658.0/m
10: GSF 10050455: BM1397:01+ 480.00MHz T:510 P:464 (26:13) | 100% WU:100% | 250.2G / 360.5Gh/s WU:5036.1/m
11: GSF 10050457: BM1397:01+ 550.00MHz T:550 P:550 (23:12) | 100% WU:100% | 374.1G / 356.1Gh/s WU:4974.1/m
12: GSF 10050588: BM1397:01+ 600.00MHz T:600 P:600 (21:11) | 100% WU:100% | 388.3G / 392.3Gh/s WU:5480.4/m
13: GSF 10050590: BM1397:01+ 505.00MHz T:505 P:505 (25:13) | 100% WU:100% | 356.0G / 363.0Gh/s WU:5071.8/m
14: GSF 10050591: BM1397:01+ 545.00MHz T:545 P:545 (23:12) | 100% WU:100% | 353.1G / 366.0Gh/s WU:5112.8/m
0: GSF 10050577: BM1397:01+ 525.00MHz T:525 P:525 (24:12) | 100% WU:100% | 346.9G / 348.8Gh/s WU:4872.2/m
1: GSF 10050582: BM1397:01+ 490.00MHz T:490 P:490 (26:13) | 100% WU:100% | 352.0G / 346.3Gh/s WU:4837.5/m
2: GSF 10050580: BM1397:01+ 585.00MHz T:585 P:585 (22:11) | 100% WU:100% | 374.1G / 377.8Gh/s WU:5278.3/m
3: GSF 10050558: BM1397:01+ 530.00MHz T:530 P:530 (24:12) | 100% WU:100% | 315.2G / 379.7Gh/s WU:5303.8/m
4: GSF 10050552: BM1397:01+ 540.00MHz T:540 P:540 (23:12) | 100% WU:100% | 324.5G / 362.8Gh/s WU:5068.5/m
5: GSF 10050555: BM1397:01+ 585.00MHz T:585 P:585 (22:11) | 100% WU:100% | 412.8G / 387.0Gh/s WU:5406.5/m
6: GSF 10050666: BM1397:01+ 600.00MHz T:600 P:599 (21:11) | 100% WU:100% | 393.5G / 382.0Gh/s WU:5337.0/m
7: GSF 10050664: BM1397:01+ 530.00MHz T:530 P:529 (24:12) | 100% WU:100% | 387.6G / 350.1Gh/s WU:4890.9/m
8: GSF 10050663: BM1397:01+ 600.00MHz T:600 P:600 (21:11) | 100% WU:100% | 349.0G / 395.3Gh/s WU:5522.5/m
9: GSF 10050451: BM1397:01+ 505.00MHz T:505 P:505 (25:13) | 100% WU:100% | 384.2G / 333.4Gh/s WU:4658.0/m
10: GSF 10050455: BM1397:01+ 480.00MHz T:510 P:464 (26:13) | 100% WU:100% | 250.2G / 360.5Gh/s WU:5036.1/m
11: GSF 10050457: BM1397:01+ 550.00MHz T:550 P:550 (23:12) | 100% WU:100% | 374.1G / 356.1Gh/s WU:4974.1/m
12: GSF 10050588: BM1397:01+ 600.00MHz T:600 P:600 (21:11) | 100% WU:100% | 388.3G / 392.3Gh/s WU:5480.4/m
13: GSF 10050590: BM1397:01+ 505.00MHz T:505 P:505 (25:13) | 100% WU:100% | 356.0G / 363.0Gh/s WU:5071.8/m
14: GSF 10050591: BM1397:01+ 545.00MHz T:545 P:545 (23:12) | 100% WU:100% | 353.1G / 366.0Gh/s WU:5112.8/m
The USB ammeter is not 'used for tuning the sticks'. It is used just to verify that you have good power and what the load is so you know if your powered hub can supply what is needed.
The adj pot freely spins around but has just the 1 track so yes it resets to zero every 360-deg. Do NOT adjust it with power on. Looking at the dial as a clock and with the flat edge as reference the flat should be between the 15 minute mark (default) and 30 minuted mark. Mine is about the 20 min mark and happily runs 575MHz.
The adj pot freely spins around but has just the 1 track so yes it resets to zero every 360-deg. Do NOT adjust it with power on. Looking at the dial as a clock and with the flat edge as reference the flat should be between the 15 minute mark (default) and 30 minuted mark. Mine is about the 20 min mark and happily runs 575MHz.
thanks, will try that. i been dialing with power ON all this while.
⭐ Merited by vapourminer (1)
Its pretty much what i did all day yesterday dialing up & down , looking at cgminer as it hits plateau and resets every few secs and looking at the values on the usb ameter as it responds to cgminer and to be honest, i dont even know what am looking for ... i just see the amperage go up until it resets when cgminer hits plateau ..
its been more like blind tuning & gambling, hoping to hit the target..
i believe there are measures to reach this..
this was supposed to be one of the fun part, i waited another 2 weeks for this final phase using the ameter to finally set up the rest of the sticks but its not at the moment ..
I have atleast one stick i did not tune because it already runs efficiently at the set hashrate without issues ...
I have tried to use readings from that one to see how to set the others but still ...
lots of us here have used the usb ameter to tune their sticks into stable hashrate, i need your inputs ...
Am I looking in the wrong direction ? Am I mising something ? If you keep dialing clockwise / anticlockwise, does it start all over from 0 after a 360 dial ? or it keeps going 360+ , 720+ etc ?
and sometimes while dialing, i hear a tini tiny fast beep with fast flashing light on the stick, is that a too high dial or too low dial signal?
this is the ameter i use
https://www.amazon.com/Voltmeter-Ammeter-Current-Multimeter-Suitable/dp/B08RHKVHJZ/ref=sr_1_29?keywords=usb+volt+amp+meter&qid=1647004125&sr=8-29#descriptionAndDetails
How can i use the reference stick to setup the rest of them ?
its been more like blind tuning & gambling, hoping to hit the target..
i believe there are measures to reach this..
this was supposed to be one of the fun part, i waited another 2 weeks for this final phase using the ameter to finally set up the rest of the sticks but its not at the moment ..
I have atleast one stick i did not tune because it already runs efficiently at the set hashrate without issues ...
I have tried to use readings from that one to see how to set the others but still ...
lots of us here have used the usb ameter to tune their sticks into stable hashrate, i need your inputs ...
Am I looking in the wrong direction ? Am I mising something ? If you keep dialing clockwise / anticlockwise, does it start all over from 0 after a 360 dial ? or it keeps going 360+ , 720+ etc ?
and sometimes while dialing, i hear a tini tiny fast beep with fast flashing light on the stick, is that a too high dial or too low dial signal?
this is the ameter i use
https://www.amazon.com/Voltmeter-Ammeter-Current-Multimeter-Suitable/dp/B08RHKVHJZ/ref=sr_1_29?keywords=usb+volt+amp+meter&qid=1647004125&sr=8-29#descriptionAndDetails
How can i use the reference stick to setup the rest of them ?
I just received the USB ammeter i ordered, been trying to use them to tune my Fs up for some hrs now..
i have looked through the thread from pg 1 and did not find anything pertaining to vcore voltage tuning guide or settings.
I have literally been testing & combing through the forum for the past 7 hrs with no luck. seems i have worsened the sticks from random tune ups.
anyone know where this information is ?
@kano, i hear your discord has this info, can you share pls ?
while tuning, what do one watch out for in terms of target? (V)? (A)?
do you tune while cgminer is running ? or idle ?
appreciate any help i can get.
i have looked through the thread from pg 1 and did not find anything pertaining to vcore voltage tuning guide or settings.
I have literally been testing & combing through the forum for the past 7 hrs with no luck. seems i have worsened the sticks from random tune ups.
anyone know where this information is ?
@kano, i hear your discord has this info, can you share pls ?
while tuning, what do one watch out for in terms of target? (V)? (A)?
do you tune while cgminer is running ? or idle ?
appreciate any help i can get.
I am trying to pull up the default miner.php from cgminer on linux using my ip-address/miner.php i assume.
Am i doing it right ? Missing something ? Anyone ?
Am i doing it right ? Missing something ? Anyone ?
You need a web server with PHP running on the box.
If you have a standard Linux setup, you can check if apache is installed by just pointing a web browser at the ip address
If it isn't you need to install Apache and PHP
If it does work, you can copy miner.php the /var/www/html
Then you can try IP-address/miner.php
If that doesn't work you need to install PHP
Once installed and once you have edited miner.php you should be good to go.
Thanks. I had to install them all and i am at the miner.php edit phase currently...
abit tricky there.. what should i look out for to change in it ?
Yeah I never use a config file, just a command line or shell script that's easy to edit because it's basically one command line.
got it.. thanks.
finally, thanks guys.. every single issue i had has been resolved including the usb bandwidth thing even tho one of them is still playing catch up... seems it only happens on windows...
Im currently running rasp OS on one of my pcs and so far so good...
just waiting for the usb amp meter to set all the sticks at a set power rating...
Code:
[2022-03-02 20:30:38.221] GSF 0 (5s):308.0G (avg):322.8Gh/s | A:48023 R:0 HW:16 WU:4508.8/m
[2022-03-02 20:30:38.221] GSF 1 (5s):382.7G (avg):327.3Gh/s | A:57185 R:0 HW:64 WU:4572.2/m
[2022-03-02 20:30:38.221] GSF 2 (5s):390.5G (avg):353.4Gh/s | A:61322 R:0 HW:16 WU:4936.8/m
[2022-03-02 20:30:38.221] GSF 3 (5s):348.5G (avg):339.7Gh/s | A:39946 R:0 HW:96 WU:4747.5/m
[2022-03-02 20:30:38.221] GSF 4 (5s):267.8G (avg):244.3Gh/s | A:19663 R:0 HW:16 WU:3413.1/m
[2022-03-02 20:30:38.221] GSF 5 (5s):307.1G (avg):338.0Gh/s | A:42496 R:0 HW:32 WU:4726.2/m
Oh yeah that old guy. Error as old as cgminer running USB devices. From the Compac/2Pac support thread:
Q. How to get past "USB init, open device failed" ... "you don't have privilege to access" error.
You'll want to cd into the correct cgminer folder, but that is probably obvious. Either that, or run cgminer as root.
Quote
Q. How to get past "USB init, open device failed" ... "you don't have privilege to access" error.
Code:
cd ~/git/vthoang/cgminer/
sudo usermod -G plugdev -a `whoami`
sudo cp 01-cgminer.rules /etc/udev/rules.d/
sudo reboot
sudo usermod -G plugdev -a `whoami`
sudo cp 01-cgminer.rules /etc/udev/rules.d/
sudo reboot
You'll want to cd into the correct cgminer folder, but that is probably obvious. Either that, or run cgminer as root.
That solved the issue, thanks an bunch. what of the config file ? i will like to input my settings in it ... how do i create / locate it ..? looked through the cgminer directory looking for gekko.config i imagine but didnot find one ..
There's a link in the first post, to a post hanging out on Page 3, with all the instructions you could want.
Thanks. I found the post & was able to setup cgminer just a couple more things...
1. im not yet able to generate the gekko.config file... still not sure how..
2. when i run the cgminer, it showing GSH errors , cant detect miner which i believe should have been GSF hence looking for the wrong hardware.. how can this be corrected ?
Some indication of the output of the screen in [ code ] tags would help, or a screenshot.
Certainly .. see below.
Code:
[2022-03-02 14:00:21.513] Pool 0 difficulty changed to 442
[2022-03-02 14:00:21.982] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:20
[2022-03-02 14:00:21.982] See README file included for help
[2022-03-02 14:00:21.982] GekkoScience detect (2:20) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.032] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:19
[2022-03-02 14:00:22.032] See README file included for help
[2022-03-02 14:00:22.032] GekkoScience detect (2:19) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.082] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:18
[2022-03-02 14:00:22.082] See README file included for help
[2022-03-02 14:00:22.082] GekkoScience detect (2:18) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.414] No devices detected!
[2022-03-02 14:00:22.414] Waiting for USB hotplug devices or press q to quit
[2022-03-02 14:00:22.415] Network diff set to 28T
[2022-03-02 14:00:27.631] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:20
[2022-03-02 14:00:27.631] See README file included for help
[2022-03-02 14:00:21.982] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:20
[2022-03-02 14:00:21.982] See README file included for help
[2022-03-02 14:00:21.982] GekkoScience detect (2:20) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.032] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:19
[2022-03-02 14:00:22.032] See README file included for help
[2022-03-02 14:00:22.032] GekkoScience detect (2:19) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.082] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:18
[2022-03-02 14:00:22.082] See README file included for help
[2022-03-02 14:00:22.082] GekkoScience detect (2:18) failed to initialise (incorrect device?), resetting
[2022-03-02 14:00:22.414] No devices detected!
[2022-03-02 14:00:22.414] Waiting for USB hotplug devices or press q to quit
[2022-03-02 14:00:22.415] Network diff set to 28T
[2022-03-02 14:00:27.631] USB init, open device failed, err -3, you don't have privilege to access - GSH device 2:20
[2022-03-02 14:00:27.631] See README file included for help
There's a link in the first post, to a post hanging out on Page 3, with all the instructions you could want.
Thanks. I found the post & was able to setup cgminer just a couple more things...
1. im not yet able to generate the gekko.config file... still not sure how..
2. when i run the cgminer, it showing GSH errors , cant detect miner which i believe should have been GSF hence looking for the wrong hardware.. how can this be corrected ?
found this on amazon: X-DRAGON Dual USB Digital Power Meter Tester
is that it ?
Yeah, look for 'USB amp meters', but it sounds good. I personally prefer the straight ones, where the miner is plugged in a straight line with the USB ports. That way it fits better onto the hub. But any type should work.is that it ?
Thanks, I found the type you refer to, inform of a flash drive.
You also need to have a USB power draw thing (I don't remember the technical name but it plugs into the USB port and the stick plugs into that) for testing and adjusting voltage because you can end up with way to much power even at 500MHz if you have too much amp wise if you adjust too much on it. After I finish each stick I just move the next stick onto it. So you only need 1 of them and they are less than $20 on Amazon.
Nice. will look for that. do you have a link to share on amazon for it ?
is that it ?
You also need to have a USB power draw thing (I don't remember the technical name but it plugs into the USB port and the stick plugs into that) for testing and adjusting voltage because you can end up with way to much power even at 500MHz if you have too much amp wise if you adjust too much on it. After I finish each stick I just move the next stick onto it. So you only need 1 of them and they are less than $20 on Amazon.
Nice. will look for that. do you have a link to share on amazon for it ?
I think you are going to continue to have problems on a Windows based machine. Each stick upon receiving them I did run myself on my personal desktop (at the time a AMD 3950x on a Gigabyte Aorus MB, but I used a USB hub that could provide 2.5A so even at 500MHz it would get angry at points). The PI is a cheap very easy to setup solution and you can just set the sticks up with some kind of cooling solution and forget about them really. I monitor everything through the default miner.php included in cgminer.
Would Prolly go that route, hopefully i get sorted out. thanks. about the miner.php, how do you access it ?
I don't want to quote because the post he made was very long. It's been awhile and I got help from the guys on here and the ones in the Kano Discord, but adjusting the vCore voltages for whatever reason made everything happy. I currently have 9 Compac F's running at 500MHz (I am waiting on another batch of Gekko hubs so I have one on a hub that can't do more than 2.0A (if it blips above for more than a second it shuts the port down and resets the stick), but I have all 3 hubs connected via their own USB cable to a single Raspberry PI 4 (8gb version).
Rasp Pi4 has only 4 usb ports, how do you manage to plug them all in including keyboard & mouse and i assume you're not running windows, as i tested out 500MHz on windows, the WU sits at 4,4xx/m while yours runs @ 4,6xx/m.
is it on Linux ?
The vcore voltage adjuster is the little VERY small phillips head looking screw on the bottom right of the PCB if you are looking at the heatsink side. There is a post somewhere in here talking about adjusting them and how much to. I went through and did every one of them one at a time. End result though was all 8 (now 9) working together with no issue
https://i.imgur.com/xIPjwwn.jpg
I will search for the post, thanks. https://i.imgur.com/xIPjwwn.jpg
Also i noticed the V - adjuster has 2 flat ends, while adjusting each of them, did they all end up in the same position ?
If so, what is the position ?
There should be a cgminer command to list all devices, and I believe it tells you the bus/port numbers. On my testers the busses enumerate as 0/1 or 0/7 depending on machine, so I run two separate instances of cgminer, one pointed at bus 0, one at bus 1/7, for easier note-taking about which devices are on which hubs during burn-in. We run up to 7 sticks at 400MHz per bus (note the bus usage is equivalent to 5 sticks at 550MHz); any more and we had stability issues like you're seeing. We test on debian linux, which I guarantee will make a more efficient use of the bus than your Windows.
thanks. I used the List all devices command and got this back:
USB list: Failed to open 9
0 total known USB device
how do you point instances to a different Bus? is there a line in the config file for that ?
Yeah the 10 port 120W hub is better than the 7port one I thought you had, but its still only 2.1A per port. I've had no end of trouble testing different hubs and only the Gekkoscience ones work reliably in my experience.
For reference, mine pull 2.7A per port on GekkoScience hub.what do you use to get the power consumption reading per port ?
Processor AMD FX(tm)-6100 Six-Core Processor - 4.12 GHz (24.7GHz total)
Sorry, but this I've never seen! 
You add the frequencies of your CPU cores? That's funny.Is it ?? well, if you prefer 6x 4.12 GHz
Little issue I'm having. 8 Sticks on 2x Gekkoscience Hubs shared between 2x PI4 8gb versions because I couldn't get 8 to play on one Pi correctly. I seem to have an issue the minute the PI has 2x USB Hubs going to it. I remember someone in here had the same issue with over 6 sticks on 1x PI. CPU/Memory usage is completely fine with 8 (Its "high" but never above 60% CPU).
https://i.imgur.com/251zqTP.jpg
https://i.imgur.com/251zqTP.jpg
This is more like what i am experiencing and where my questions originate from.
In summary, he has 8 sticks split across 2 hubs which is 2x 4 sticks per hub. then he has trouble connecting the 2 hubs with 4 sticks each on them to a single Pi4 as the problem starts the moment he plugs in the 2nd hub to the Pi4 which is exactly same thing im experiencing.
But then again, running one hub per Pi4 or PC works perfectly. So he ended up getting a 2nd Pi4 to get the 2nd hub running on its own without issues.
Is that the only solution ?? or are there some other things to try ? It doesn't seem to be a hub power issue but more about connecting multiple hubs to a PC or Pi. My PC isnt resource constrained yet.
My PC Specification:
Windows 11
Processor AMD FX(tm)-6100 Six-Core Processor - 4.12 GHz (24.7GHz total)
Installed RAM 12.0 GB
System type 64-bit operating system, x64-based processor
USB ports: 8 behind, 4 Infront (12 in total )
Suggestions ...
With that many ports, it's likely you have two distinct USB controllers in the machine. If you connect one hub to each controller, they won't be fighting each other for bandwidth. When we test at the factory, we got a bunch of machines with 6 ports in the back, 4 on one controller and 2 on another (shared with the 2 up front) so we connect one hub to each bus and let 'em eat their fill.
Also, performance on Windows is gonna suck more than *nix anyway just because of how Windows handles traffic.
Yes, it feels more like a bandwidth battle i agree. Also, performance on Windows is gonna suck more than *nix anyway just because of how Windows handles traffic.
I looked at the device manager side & found 4x OHCI USB 2.0 controllers + 1 xHCI USB 3.0 controller.
Tried swapping them around to be on separate controllers but i cant tell when they're on different controllers as im not getting the normal feedback.
any tips on identifying which controller manages which port ?
Would a Raspberry PI solve this data transfer problem ?
Damn straight it will. If you look back in this thread you find the results of me changing from W10 to a Raspi 3B -- immediate 10% increase in hash rate while running the same freq plus was able to run at a higher freq.I don't know if the issue is how Windoze allocates resources to USB or if is related to the Zadig USB driver but it made a world of difference.
edit: A thought... I assume the 2nd hub is plugged into its own port on the PC right? (it should be)
If so, did you tell Zadig to use the 2nd USB connection? If you didn't, `Doze will not like it...
Yes, each hub goes into a different port on the PC. I'm not sure i know how to instruct Zadig to use 2nd USB connection, all i made sure was to install the zadig driver for the sticks.
how can i go about about doing that with zadig ?
1A per USB port may not be enough to run them at 500
The Sidehack USB hub provides up to 6A per port (shared between two ports)
The Sidehack USB hub provides up to 6A per port (shared between two ports)
Its a 120W hub with 10 ports, im only populating 3 ports for F + cooling fan. they are pretty steady at 550Mhz when a single hub is plugged to PC but as soon as i plug in a second hub to PC, the frequencies begin to flutter & the Fs on the 2nd hub wouldnt go past 300Mhz while affecting the Fs on the first Hub causing it to drop also ...
Yeah the 10 port 120W hub is better than the 7port one I thought you had, but its still only 2.1A per port. I've had no end of trouble testing different hubs and only the Gekkoscience ones work reliably in my experience.
The only other trouble I have had was when I didn't have enough cpu grunt to drive three sticks. I was using a lowly Pi1 and it just couldn't drive more than one stick at full speed.
Oh and I managed to melt the solder off one of the chips on one stick but that wasn't terminal
The hubs supplies ok power.. there enough PC resource to go round ..