Quote from: RichBC on December 05, 2015, 05:26:47 PM

Quote from: blockchainmines on December 05, 2015, 05:03:16 PM

Honestly for me every miner is a little different. With the exception of the 2 batch 7's the firmware is on those factory installed and on one of them I left it at 625 MHz and it mined at the advertised 5TH, the second batch 7 at 625 was performing poorly and I was only getting around 3.8TH so I dropped the freq to 600 and then is jumped up to 5TH. The 19 others I have are batch 2 (which were advertised to run at 4.66TH at 575 TH), I flashed them with the most recent Bitmain firmware that supports the 600Mhz setting. When I had the time I found that really going through them slowly and taking my time tweaking with the frequency (and not always up) making small changes has made an incredible difference. For instance, I have some of mine set at 606MHz and some set 593Mhz. I do not think I have anything set over 625 but you can certainly try. Just make sure you are monitoring it closely when you make changes like that. I guess the whole point I am getting at is there is not perfect setting for every single miner out there. You can have rough guidelines that work for most but if you are trying to dial in your farm, then you need to play with the settings to see what works with your farm. Also keep in mind not all miners are going to perform at the highest Th rating possible. Some of my miners no matter what settings I have changed and close I think I have dialed it in, I have had to settle for 4.5Th when I should be getting 4.8 and that ok, its just the way it goes. If you are interested you can check out my mining set up here

Very interesting. I am a firm believer that all miners are different and benefit from monitoring and adjustment to get the best from them. I have a couple of questions?

If I understand correctly your approach seems to be to find the frequency at which the best hash rate is achieved? When doing this do you also look at the HW error rate and do you find when the Hash Rate is lower than expected for a Frequency that the HW error rate is high or is the error rate still ok?

Next have you considered that there could be a difference in your PSU's and that supply voltage that the miner has on the PCIe connectors could be different in some cases and that is influencing it's ability to hash at higher frequencies?

If you are not monitoring the voltage I would urge you to include it in your adjustment protocol as it may well add another dimension and enable you to achieve higher hash rates?

Rich

These are all good points Rich

Regarding the power supplies I stick with the same kind of power supplies up until just recently when I changed over to EVGA for my last 5 S7's. I don't really factor my power supply's voltage bouncing as a reason for the difference variations in miner performance. If I was have voltage problems then I would think my problems would be much bigger than what I have previously described. (which by the way I do not consider a problem) I would lean towards mass produced miners over high end power supplies but that is just me. Regarding HW errors, yes I do get them, we all get them and that is something that would take forever to watch over a long period of time. The truth is there are several things you can look at to monitor your minors. The most obviously thing that people look for is how fast can it hash. Now if I can get it hashing fast but the results are garbage and I am getting a lot of rejects, hw errors, etc then of course that is when I am going to dig deeper. I wasn't trying to go quite that in dept as the question was regarding frequency settings. I am pretty sure if you polled people on the forum they would all agree that not all minors behave the same and they doesn't mean we need to start to digging into power supplies/PCIe connections over a couple Ghs. However that is just my opinion, and please note I completely respect what you had to say it is just not something I would do if personally as my farm is running great. Some of my miners are over achievers and others are a little under achievers(very little) but overall I am averaging a happy 105TH. Thanks for your feedback.