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6870 Crossfire stability issues

post #1 of 4
Thread Starter 
so I recently got a second 6870, one thing is there is a bit of a coil whine at 100% load, is this my PSU being stressed? I have a Corsair 750TX. Also, most utilities I use, If I got past like 950 core, the computer freezes and bluescreens, is this remedied by increasing the voltage? I that safe? Also what is a good overclocking utility, when I use afterburner with 2 cards it often crashes/freezes/bluescreens, but this didnt happen with one card.
post #2 of 4
your psu can handle that setup no problem. Whine is not liked but kinda happens when OC'ing. Not with every card and not all the time, but it happens. When I overclocked my 560ti, I noticed if I jacked the voltage up and kept didnt bring the core clock up also, it would crash. U cant add a ton of volts for a little increase. It has to be balanced a bit. Its tough to say on each card what it will crash at, so go in steps on 10. Increase core by 10 and keep going untill it crashes. Than up the volts by 10 or 12. Keep going and running benches untill U dont see any more increase. for me my increase stopped about 112 mhz above stock. turned my 900mhz into over 1000.
post #3 of 4
Thread Starter 
This is weird, I can get it up to 990 core 525 mem at 1.193v but I cant get it to 1000 core 525 mem, I tried all the way up to 1.213. What else could limit it?
post #4 of 4
Thread Starter 
Quote:
Originally Posted by makuab View Post
This is weird, I can get it up to 990 core 525 mem at 1.193v but I cant get it to 1000 core 525 mem, I tried all the way up to 1.213. What else could limit it?
bmp
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