Quote from: GH on January 17, 2017, 08:55:10 PM

Quote from: Astennu on January 17, 2017, 08:13:25 PM

Quote from: chilewarx9 on January 17, 2017, 04:08:11 PM

i use 295x2 to mining, now hashing at 560 sol, this normal?

I'm afraid so. Im currently working on one and i have a hard time getting it above 300 sol/s per GPU.
I got it up to 306 now. With claymore V11 -asm1 -i 5

Clocks 975-1375 @ 1.105v
Memory timings are 1250MHz strap.
15.12 drivers (still having problems with newer drivers mining software just crashes after a few sec)

Timings did the trick to kick it +20 sol/s per GPU higher.

Voltages are bios modded card seems game stable so its not at the stability limit for mining.

But somehow these cards wont go as fast as the 390X. I also think 290X with different Hynix modules and Stilt timings would do even better.
When i test oclmembench im at +- 250Gb/s a 7970 with stilt timings does +- 230 with 1375Mhz. And those cards do +- 270 sols with 1000-1375 MHz.
ASM is more effective for those cards tho. Without they would do 235-240.

Only thing i can do now is do the 390X MC bios MOD but i have to do a lot more reading on that. Not that simple to do. Took me some time to figure out the timings but thats easy compared to the MC mod.

Quote from: rpg on January 17, 2017, 07:15:33 PM

Quote from: sorry2xs on January 17, 2017, 04:12:55 PM

Quote from: chilewarx9 on January 17, 2017, 04:08:11 PM

i use 295x2 to mining, now hashing at 560 sol, this normal?

that seems to be low for 2x290s a single 290x is over 300 sols

seems normal. my 290x does 340 but is modded as a 390x. before was doing in the 280 range

Did you do the mod yourself? or did you download a premade bios. I have seen those for the 290X but not for the 295X2. Not enough people owning those cards.

I do not have experience with the 295x2, but I can image you hit the limits faster than on single cards.
My 390s (non-x) are all running average above 360 H/s with OC and stock BIOS.
And yes - my modded 290X was even doing 380 H/s (!) - and also cooler than stock. I now reduced the clocks for stability as it's the primary card in a workstation, but it's still at 355-360 H/s.

I dont know Cooling is not the issue. Power delivery is also a non issue. It really seems to be localisations of the memory timings and controller.
Thats also what makes 390(X) cards so much faster then stock 290(X) cards. With a bios mod they are just as fast.
Seeing the stock hash rates compared to my strapped bios makes me think there is even more to gain.

Im currently underclocking the core but thats because i only have a 1000 watt PSU in that system. And it needs to run 5 GPU's. Stock the system with the 295X2 mining solo (other cards where connected but not mining) was already pulling 524 watts from the wall and with all cards i was hitting 1024watt so optimizations where needed. Core voltages stock are 1.25v way to high if you ask me. I got them down to 1,1v with a clockspeed reduction of 45-50MHz. (stock 290X is 1.2v if im not mistaken)

I might optimize the card more if i have time. But i only have 1 so the gain is not that big. Its mostly for fun