Hi there!
So, I got 6x R9 290 spread over 2 rigs, and for a while now, when using x-11 miner (sph, drk miner or even the new one from lasybear) I have noticed that 1
random card always have those weird fluctuations more than others and as such, hashes slower. Usually the fluctuation on that specific card just get worse in time and as such, the hash drops even further.
Now, when I say random card, I really mean it, sometimes its card number 1, sometimes number 2 and sometimes number 3. Mostly 3 though and it shows like this:
GPU 0: 71.0C 72% | 3.662M/3.638Mh/s | R: 3.0% HW:0 WU:0.054/m I:19
GPU 1: 65.0C 66% | 3.613M/3.628Mh/s | R: 1.8% HW:0 WU:0.052/m I:19
GPU 2: 66.0C 67% | 3.222M/3.284Mh/s | R: 2.9% HW:0 WU:0.044/m I:19
As you can see, card #3 hashes at 400kh/s less than the other 2.
Here's a screen shot of the fluctuations I'm talking about:
I tried different configurations and I would try changing some hardware, but what I didn't mention is that both rigs are completely different with the exception of the cards and the PSU (1000w Corsair).
1 rig is made out 8gb ddr2 ram, asus motherboard and amd cpu while the other rig is made out of a 8gb ddr3, gigabyte motherboard and intel cpu.
*Note: When mining Scrypt or N-factor coins there's no issue whatsoever.
Oh and I forgot to mention that while using girinos miner (the 2% fee one) than half the times I manage to get the cards to run just fine while in the other half it's similar to what I wrote.
** I've tried powertune +20,+40,+50 but haven't seen any change.
Any ideas? Been at it for some time now...
