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hey guys, how can I report to the development team?
I have a XFX HD7990 video card. are working perfect in Claymore's Zcash AMD GPU Miner V11.1 (Windows 10 64bit), It gets speed about 259 h/s on GPU 0 and 1, total about 520 h/s. But in the GPU miner V12 are all not working on my video car, GPU 0 get 0 h/s and GPU 1 less 100 h/s. I have been change the different radeon drive V15, V16, V17 still not working.

MY another 2 video card HD7950 are working perfect in GPU miner V12 and get 280 h/s in over core clock 1100mhz.

please help my HD7990 fly up in V12

thanks,

I have working 7990 (=600s/s) with stock on 12.3 with -i 3. Driver 15.12. In case you modded memory try to return to original bios.

Thanks -i 3 worked. now get 290 h/s on GPU 0,1. try before -i 4 or 5 having problems

Is that 290 h/s for one card?

290 is for one core of the card. A 7990 does ~600 H/s.

I had a similar issue with the 7990, to keep it worked I had to reduce intensity, I was using win 7, but it disappeared when I switched to win 10.

It seems that the 7990 is much better than the RX 470 or 480.

It's also at least 3x the cost and probably 2x the power usage lol.

The cost for a second hand 7990 (you can't find new anymore) is the same like a Rx 480 new and power usage for zec mining is ~300 W undervolted.

Question: how to make it undervolted? Is it in the radeon setting and what's your parameter?

Use MSI afterburner and go to settings and unlock voltage settings. After you have a stable card you can place those settings on the config file.

Thanks a lot and I will try it later. one more thing what version Radeon driver are you using? V15, V16 or V17

Older video cards use 15.12. newer like the RX use the latest unless you are modfing the bios where the latest you can go is 16.9 I believe

Don't you have to modify the driver files if you go to 16.9 with modified bios on Rx?

I can be mistaken with the version that still allowed unsigned bios