Fun pool. Mining TRC now for ~2 weeks. One thing is killing me tho...

Server itself.  Waiting for start page to load takes ages. Today it took over 30 minutes (started long before 6.00 GMT, finished few minutes after). Must be some kind of a record. www.multipool.us is as far I could get. Opening detailed stats, etc is impossible ATM.

Mining now for few days. Pool is nice, although I have problem with Dynamic Diff.

It makes USB Block Erupters pretty much useless. I must restart miner frequently if I want to keep 8 Diff which is more than enough for my setup barely scrapping past 10Gh.

Blast! Pool switched now diff to 20!!! And I thought that switching to 12/13/14 was bad. That is less than 100 shares /BE daily. If this persist I really must return to BTC-Guild.

That really got me ROFLed across the room few times. 

No problems here too. Was using few 7950 in 1.0/2.0 and no issues at all. Boards varied from really old 775 to 1366.

But I got rid of VGA miners. Heat was simply unbearable. 

Well from my personal experience.

Don't even try to cram 7 BE into 7 port USB 2.0 hub. It will never work (worst case scenario - it will burn hub/usb port on motherboard or USB card). It happened to me once when I plugged 7 into 7 [active] port hub and it fragged NEC USB card. Tested few and 5 is max for stable work with USB 2.0 hub. With 7 I've burned pci usb controller, but before it fried 2 out of 7 returned always 100% HW errors.

Of course cooling is a factor. Hot chips usually bang too many HW errors. Nothing fancy slow fan will do just moving hot air.

Best way with plethora BE is with really big USB 3.0 connected active hub. It will support much more hardware and power shouldn't be an issue. I went with Manhattan MondoHub [161718]. Pricey, but hey - 28 ports 4x3.0 and 24xUSB 2.0. Practically usable 2x USB 3.0 and 18x 2.0 (obscured side ports, too bad that BE boards are so wide). I will test at later date if it will detect BE properly when plugged into obscured port with extender.

My small, temporary station, not completed yet. For now connected to main PC [W7 64/BFG 3.1.3].

http://s22.postimg.org/if8au5h9d/DSCN8799.jpg

There is for certain one picture somewhere showing 30+ BE working without problem. My guess in your case - insufficient power. Ditch USB 2.0 hubs and try couple USB 3.0 - the only way to supply stable power to so many BE sticks.

Out of curiosity. Is there option to manually pause work on all devices [Pause All/Unpause All]? For example when resetting router, so BFG won't start hooping to other (fail-over) pools.

LOL I disconnected miner at 99.97% because I had to (powerful thunderstorm). Don't tell me that all work done before that is worthless [0.000000000] because [insert excuse a/b/c/d....]. It looks like returning to Slush pool was a mistake. End of story.

No, but I mined this humongous block for ~13 hours - couldn't wait till end. It is frankly completely irrelevant at which end I mined. I want share for job done. It was the same with that 7h block on Saturday. Got big 0 at first, and then it recalculated itself after 12 or so hours. If it doesn't with this one, naquadah enriched nuke is prepped and ready 

I demand a recount

14h block it must be. Gaining like 0.02%/hour

Holy Moly

10+ hours block. That's pain even with ASICs. Need another 10 BE. Again will get some insignificant peanuts like with that 7+ hours block - it is good that there is so many places after 0.000..... 

Neither cooling supplied with 7950 is good enough. Simple as that. Without 120mm fans there is no hope of expelling vast heat mining produces (I wrote a post some weeks ago comparing 2x120mm cooled GTX580 TF3 @65C and 2x80mm 7950 TF3 80C core + 85-90C on VRMs ).

Excluding prohibitive liquid cooling for mining, by few galaxy lengths best option to cool mining 7950/7970 is Prolimatech MX-26. You can chop, just like that, up to 25C on core and up to 15C on VRMs [vary on airflow and other stuff].

Of course there is an issue with voiding warranty and 3.5/4 slot size cooling, but that is best choice. Tested few 7950 and ALL sound like jet taking-off. Useless 80mm fans. I don't know which magician (no matter MSI/Gigabyte/ASUS/etc) thought that using 80 instead of 120 is good idea, but there you are...

Just like HellDiverUK getting rid of VGAs. Even when compared to tiny USB Block Erupter all VGAs are just hopeless. Looking at local prices and for a cost of one MSI TF 7950 I can get 4 USB BE - ~500Mh/s@175W vs 4x330Mh/s@12W total. No-brainer.

Is CGWatcher 32b only? I can't save any configuration profile with 64b version of BFG, but it works with 32b CGMiner. Always get Net Framework "alarms" that 32b process can't write 64b one. Tested on various machines with totally different setups but same Win7 64b OS.

http://s11.postimg.org/ev56r6fs3/CGWatcher_Monitoring_2013_06_10_22_38_09.png

By far and wide my worst day since started mining on Slush. Simply shocking 

I have question regarding Eligius pool via GUIMiner.

I get constantly  "Listener for "Eligius ATI": gbt.mining.eligius.st:9337 [or getwork.mining.eligius.st:8337 not to mention bugged stratum] 08/06/2013 22:52:55, warning: job finished, 1:0:Tahiti is idle"

Then "Listener for "Eligius ATI": gbt.mining.eligius.st:9337 [ + same as above] 08/06/2013 23:02:57, long poll IO error"

And finally card just stops working with something like:


Card just spins up and down, up and down. It is more annoying than constant whine of overworked fans. GUIMiner is only way for my 7950 to work on Eligius on my primary PC. Tried to setup Eligius via CGMiner but it detects only first VGA which is GTX580 (not used for mining) even when I explicitly select 7950. BTW: If I plug GTX580 via CUDA miner on Eligius it works like charm. And if I run CGminer from Command prompt it can also run only GTX580 (Tahiti is not on list of GPUs although it is detected when cgminer is started with -n parameter).

On different PCs where I have only 1 VGA (7950) CGMiner via GUIMiner works (although it always show "connection problems" but mining works OK and I didn't noticed Listener messages.

Any tips?

W7 64b/GTX580 MSI TF3 (primary)/7950 MSI TF3 (miner)

On Slush this setup works nice, but Eligius have certain appeal to me as whole, and (sadly) Slush is often target of DDoS.

Yeap same here. While one easily sits on 480-490 MH/s out of the box rest struggle to reach 460 MH/s with seriously bumped core clock. Really baffling, but there you are. Default clock is 960/1250. Version for whole batch is 912-v276-032 r7950 tf 3GD5/OC BE. Built on reference 7950 PCB with 2 6pin PEG connectors. When underclocked memory sits on 800 MHz. I have primary, separate GTX580 which is not used for mining. In such setup memory can be underclocked even lower as mining VGA is not used to display content on the monitor.

Noise is deafening with fan running constantly over 3300-4000 rpm. Border line for silent operation is 2800 rpm, but it is impossible to mine BTC with such low fans. Temp just shuts up past 80++ in no time.

Weakest point of pretty much all 7950 (but MSI TF in particular) is cooling. With 80 mm fans there is simply no way of keeping the noise down with enough air pumped. I have one TF slapped with 3x120 Scythe 1200 fans 2 on top and 1 hanging on the edge pumping air under the shroud roughly where VRM section is located. This one is relatively quiet. Remaining TF mounted in classic tower case without any additional cooling make massive racket with fans constantly 3500+ and temp not exceeding 80 on core and 83 on VRM. My only question is who the hell thought that 80mm fans are good enough to cool VGA. My GTX580 is also MSI TF3, but with 120mm fans. It is brilliant, brilliant, sublime card, even when pushed to the absolute limit it is pretty much quiet with absolute negligible fan hum when loaded 100%.

Thinking about watercooling all miners, but cost is a bit prohibitive. Maybe I will slap Prolimatech's MK-26, with guaranteed drop of ~15C degrees it is cheap way of squeezing more MH/s with less noise.

Well I never said that I wanted to move one card did I? Minimum 2 maybe 3. But to be honest it hit me yesterday: why not utilize DimasTech Easy XL testbench for mining. It will be slightly more expensive option, but I think, in the long run well worth it. Must carefully think about pros and cons.

Browsed yesterday all products (shame to admit for few hours lol) on DT site and I'm completely sold on that blue super-duper sexy bench. Plenty of room for spacing + superbly simple way of adding more fans with FlexFan mounting system.

Of course biggest advantage is that inside EU I don't need to bother myself with absurd shipping/customs cost from US. Nice.

@zackclark70

Exactly what I wanted to hear for my 7950 he he

@deslok

That is the nature of my dilemma. There are boards which have issues with more than one. Hmm... need to obtain powered riser then, or two, even better whole 3 or 4. Just to be sure 

I couldn't connect [in the morning 6 GMT] on one machine via api-slush, but it worked just fine with stratum.bitcoin.cz:3333 on 2 machines (one at home and one at work) for whole day. Lately I had many issues with api while stratum appears to be working nicely. Always falling back to Eligius if slush is dead, but today passed without incidents (except small issue in the morning).