mixed gpus; 6970 & 7970 (hash rate way lower on 7970)

[slaithe]

The 6970 is actually an unlocked reference Sapphire 6950 clocked at 926/1375 @ 1.175v and gets 500 Kh/s.
The 7970 is an XFX Double D GHz Edition FX797GTDFC.  I'm plugged into it as a display, since it's not as reliable, thus far.  Leaving it at stock clocks of 1050/1500 and stock voltage, it's pulling less than 300 Kh/s and I'm seeing image corruption flash on my screen from time to time in Firefox.  O.O

WTF.

GPU 0: 6970 503.7Kh/s
GPU 1: 7970 278.1Kh/s

cgminer --scrypt -o http://POOL -u USER -p PASS -I 19,13 -g 2 -w 256,256 --shaders 1536,2048 --thread-concurrency 8000,8192

EDIT:  Sorry, but does anyone have any suggestions to get the 7970 to 600 Kh/s +?  I tried a few configs on the following page, but to no avail. https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison#wiki-ATI_AMD_GPUs

[jhd]

i have a similar issue with 5970 and 6950 cards

[slaithe]

Ok, I managed to bring the 7970 up to 500Kh/s.  Uninstalled all drivers, cleaned with Driver Sweeper. Installed AMD's OpenCL SDK (AMD-APP-SDK-v2.8-Windows-64), then AMD_Catalyst_13.3_Beta3.exe.  Disabled ULPS.  For now I'm leaving the 7970 on stock clocks (1050/1500) since I just bought it, and observing its behavior.  Pity it still lags behind the unlocked 5950 little bit.  Plays games nicely, tho.  Twin fans goes to 100% during mining and one is noisy. :/  Display artifacts still show up on Firefox while mining.


Will be tweaking, contacting manufacturer support, etc.

In any case, this is gatting me 1000Kh/s:

cgminer --scrypt -o http://POOL -u USER -p PASS -I 19,13 -g 1 -Q 2 -w 256,256 --thread-concurrency 8000,8192 --auto-fan


May do that tweak to set the 7970 -g at 2, later.

[Mylon]

Also having the same XFX ones, though mining bitcoin no litecoin. Found that worksize 128 helps, and not sure if you have the option with litecoins, but as kernel diablo is recommended. Also what kinda temps are you looking at on your XFX? 85?

Owh yea, and anything above intensity 11 gives me artifacts if I do anything on my pc. (guess thats normal on XFX cards... they won't output display properly anymore... too busy )

[slaithe]

Clocking down the XFX to equal my 6970 (926/1375) significantly cut on the heat and lost only about 20Kh/s on it.  They're voltage locked, so couldn't do anything about lowering that. :/
Anyway, since I can't run this brand new gpu at stock speeds without issues, I'm just going to return for a refund and get a more stable card.  I really wanted to like this card and see it perform well, but Newegg user reviews state a lot of similar issues with noise, heat and failures.