ongoing 7970 crossfire problems

Sacriel

Sacriel

Sacriel

Associate
Joined
31 Dec 2008
Posts
35
Location
Derby
Good day sirs,

Im after a little advice, I appear to get terrible performance out of my 7970s, with one 7970 I get around 60fps in ultra (multiplayer) and with two, i get upto 100fps (when facing a quiet area of the map) or 60-70 fps

after 15 minutes of playing bf3 on ultra my pc crashes and reboots, im using a coolermaster 850watt psu

I recently took the side of my case off to listen to the fans to see if i can figure out whats going on and ive noticed a distinct hissing coming from my machine, ive tried each card seperately and i still hear the same hiss - i cant tell if its my PSU or mobo, i presume two brand new 7970s dont have the same issue.

im wondering if there is a chance my psu/mobo is faulty, and causing the system to drop under heavy load instead of the idea that my 7970s (or one of them) is faulty

im out of ideas short of buying a new mobo/cpu and psu - can anyone offer any advice?

spec me a mobo/cpu/psu just incase, nothing too crazy but i want decent performance, £400 ish tops for mobo/cpu/psu
 
 
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I've tried, but the sound is localised next to the graphics card slot, which is directly above the psu so its almost impossible to tell
 
my pc reboots when the top of the two cards (an inch apart) hits 70ish

i cant seem to make my macine crash if i benchmark both cards seperately

the PSU makes more noise the more the computer is under stress, eg. its silent when browsing, audible when playing minecraft and screetching when benchmarking heaven 3.0
 
AM Kingston HyperX Genesis 12GB (3x4GB) DDR3 PC3-12800C9 1600MHz Triple Channel (KHX1600C9D3K3/12GX)

Just got 2 M4 SSD to RAID 0 for my boot drive, currently on a gen1 ssd raid
 
nxzt phantom

120mm on the front pulling in, one on the side directly beside the two 7970s

220 blowing out the top of the case, 120 blowing out the back

even with thes side completely off, and an additional 120mm at the end of the two 7970s, so one blowing lengthways down the cards one blowing sideways directly into the two gpu fans - my machine still reboots under full load for a few minutes, even with gpu fans artificially set to 50% (with auto settings they only hit about 30% before the pc reboots)
 
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Sacriel said:
nxzt phantom

120mm on the front pulling in, one on the side directly beside the two 7970s

220 blowing out the top of the case, 120 blowing out the back

even with thes side completely off, and an additional 120mm at the end of the two 7970s, so one blowing lengthways down the cards one blowing sideways directly into the two gpu fans - my machine still reboots under full load for a few minutes, even with gpu fans artificially set to 50% (with auto settings they only hit about 30% before the pc reboots)
Click to expand...

It appears to be a PSU issue.
 
Kingston HyperX Genesis 12GB (3x4GB) DDR3 PC3-12800C9 1600MHz Triple Channel
Intel Core i7 920 D0 Stepping (SLBEJ) 2.66GHz (Nehalem) (Socket LGA1366)
Gigabyte GA-EX58-UD3R Intel X58 (Socket 1366) DDR3 Motherboard
Titan TTC-NK85TZ Fenrir CPU Cooler#
2x Gigabyte 7970
 
jamesfreddie said:
It appears to be a PSU issue.
Click to expand...

Ironically my GF gets her upgrade tomorrow including a new 850 PSU

I will pop that in my case and run the same setup again, see if the hissing and the crashing goes away

if the hissing/crashing persists I guess its time for a new mobo, ill try both my cards in her machine to stress test them

so much to do, its such a pain buying all this gear then spending weeks with your pc on its knees
 
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