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Quote from: VasilyS on July 13, 2019, 05:13:50 AM

r9 290/390 give 29-30 mh/s while mining on Ubuntu. For a serious increase in performance, you have to use Ubuntu version no higher than 16.04 (with new Ubuntu kernels these cards have poor compatibility). You have to install driver version 17.40 and AMD SDK kit. Switching to Linux-like OS gives additional 10 mh/s (50%). There is a guide how to do it (in Russian): https://www.cryptoprofi.info/?p=3313. Ubuntu will be useful for mining on all old cards including R9 280, 290, 295 and 390.

I will give Ubuntu a try for these old cards. But how about rx 470 / rx 570? Will they also have higher hash rates with Ubuntu?

not just linux, it's the AMDGPU-Pro driver improving things. I was testing an old HD 7850, gets 10-13MH/s on windows and FGLRX on linux, but AMDGPU-Pro on SMOS got me 17-17.7MH/s. HiveOS just refused to use the 7850. SMOS and HiveOS both got me about 27-30MH/s for an R9 290, but only 19-20MH/s on windows. My RX cards were the same on linux distros in general. The RX Cards were the same on linux and windows with compute mode enabled*. linux was doing the same thing as the compute-mode by default, I believe AMDGPU-Pro is basically defaulting to compute-mode behavior for all GCN cards while windows only uses that behavior on GCN3 and up.

It depends what coin you are mining on Daggerhash.

You said you got 7850 running at 13MH/s, since every 7850 has max 2GB of ram you most likely are mining some extremely low DAG coin like Expanse.

So with DAG #0, an R9 280X can mine at 27MH/s and an R9 290 can mine at 31MH/s. I know because it was there when ETH had low DAG numbers.

However you can't mine ETH with an R9 290 at 30MH/s anymore, because sometime last year when the DAG increased the speed slowed down and you get like 15MH/s or less with the R9 290. With the Pitcairns or Tahiti's you can't even mine ETH.

You can mine those other coins but their profitability is way low. And ETH profitability is not that great either. So no point in using those GPUs. Just sell to gamers instead and get a cheap RX 470.

One of my R9 290s is mining ETC at 29.8 right now, on SMOS. 1040 core, 1250 memory. My other is doing 28.2 at 977mhz core 1250 memory (these are the cards stock settings from factory). edit: I do have ref set to 40 on both, but I don't believe it makes a difference with how much bandwidth they just naturally have, so have it set Just Because.
The 7850 was mining Callisto on SMOS at 17MH/s before it got just a little too big to fit even on linux, the 13MH/s I managed on windows was with a wildly OC'd core and memory with callisto. Expanse was about the same as callisto, Ubiq did better with its smaller DAG (I think its ethash is also a slight modification over normal?? Still don't know for sure). On ubiq I still got 17 on linux, but was able to pull 18MH/s on windows with a high OC.

Hmm, I did not know this.

So basically the Hawaii slowdown with the DAG is not related to the GPU architecture but to the operating system and drivers being used.

Thanks for telling me this, I might dust them off and power them up again if I can get close to 28MH/s. Really surprised nobody has mentioned this before on the Claymore thread. Tons of people complaining why their 290/390 is slowing down and nobody could figure out the issue. Most just eBay'd or Craiglisted their R9 290 and got an RX 470 instead.

If ETH can get back above the $300 area again then with the huge power hog that the R9 290 is, it still might be a little profitable. The Reference design is rock-solid built and very stable at any temps.

I'm using phoenixminer myself. I found it odd that I've only found 1 other person that seemed to realize the old GCN1 and GCN2 cards work so much better on (modern) linux for pure stock, and they were mining ubiq on a rack's worth of the same powercolor HD 7850 I have, tuned to ~90W and 17MH/s. I have yet to see how Tahiti cards do, but I really want to know now that I've seen Pitcairn and Hawaii do so well.

I don't know about the Hawaii but I do know that the Tahiti and the Pitcairn running under Ubuntu suffered the same DAG thrashing bug on Linux as it did with Windows. This was with the Claymore miner and using various AMD drivers.

This however was a long time ago, probably about 2 years ago and I haven't tested it since. Maybe out of pure boredom I will test out the Tahiti's using PhoenixMiner on some low DAG # coin and see what the results are.

90 Watts is pretty good however are you sure its accurate. I remember my Tahiti's back in 2016 mined at 20Mhs and used exactly 200 Watts each.

I mentioned previously FGLRX has the problem with thrashing, AMDGPU-PRO doesn't. Also, Pitcairn is much much lower power design than Tahiti. Same process node, but the 7850s were only 120W TDP cards. Not sure if they had theirs modified to get the lower power. (VBE7 can adjust frequency/voltage settings on GCN1 cards vbioses, but amdgpu ignores any memory setting above 1250mhz and caps it there on Pitcairn, there's a file in the opensource side of the amdgpu-pro driver specifying "quirks" that needs modified and recompiled to OC past that)
EDIT: Also, I had some trouble getting amdgpu-pro to work with that 7850 on vanilla unmodified ubuntu besides installing amdgpu-pro myself last year, it'd only enable less than half of the memory and 8CUs, so I've been exclusively using SMOS, which is derived from ubuntu, to test it. I probably should check the state of things now