RMA your PSU now and replace it.

I had a 750W PSU running 2x6870's for little over 12 hours before it literally went bang and sparks shot out of it. For those 12 hours it was a kinda "hot" smell, even though the PSU didn't feel hot. Faulty capacitors. Best be safe than sorry

My dear,


first of all you should get easily 570khash on each maybe 600 with 72C temp (room temp25C) with stable condition =>1 week
1st- get nice cheap professional PSU like delta series for IBM serveres - you can get them under 20 bucks with 1200 SERIOUS WATTAGE capability,(there are 1800 and even 2,5/6/8Kw versions on the market) unscrew it, split and let them breath/cool maybe add some fan... (Im supplying 4X 7970 on 1  = one , 1200db  delta ibm)
2nd check voltage and amperage on all pins for your knowledge [and do it always before adding extra power consumption unit]
3rd play with your mem and gpu clocks at least long you did it  already with your girl/boy Friend
4tth its really possible to get almost  600khash on 7950 specially if you run cgminer under any debian tree distro.

5th- in need of answers pm me



this are rates for scrypt mining LTC/FTC/CNC etc

7th (don't ask where is 6th) Never trust any PSu , always open it and check main components like trafo, BIG capacitors etc.. I got bunch of shit worth, 1000 watt called psu on stickers. Don't trust stickers


8th adjusting voltage on gpu/MB in my private opinion is pointless. Let me earn some lesson if you are successful with over/under volting

I tested 13.4 but my bitcoin hashrate dropped from 630 MH/s to 560 MH/s. Also after that I was unable to uninstall the drivers and revert back to 13.1 (even with driver sweaper). Cgminer was also crashing upon startup. I had to reinstall Windows 7 64 bit to get all fixed. Using Sapphire 7950 boost OC @925 MHz stock version (of course my GPUs are overclocked over these values).

I do not know how is on Linux but if you have similar setup, just do not bother with 13.4.