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7950 Crossfire Low FPS Issue

Last response: in Graphics & Displays
December 15, 2012 7:54:43 AM

I've recently went from a single 7950 GPU to Crossfire for the first time, I thought it would be a good choice to get a smoother FPS but boy was I wrong.

I'm using dual 7950's both Sapphire (Stock 925/1250)

I7 2700K O.C to 4.5Ghz

I use to run GTA IV Maxxed W/ Graphics mod on a single GPU around 35-40FPS, Crossfire mode I get the same.

Crysis 2 I ran smooth at around 29-32 FPS on a single GPU, Crossfire mode I'm lucky if I hit 40 (No graphics mod, Ultra DX11)

Hitman Absolution I feel like I'm getting less FPS, I haven't checked what I get on a single GPU but Its lagging now and before it didn't.

I haven't tested BF3 yet, nor Farcry 3 but every game I've played with a single GPU seems to be granting me the same FPS or less on Crossfire.

I'm up to date on all drivers, and GPU-Z recognizes both GPUs in Crossfire mode.

Also, when I run 3DMarks 11 on Extreme, I can't get above 15-25FPS
a b U Graphics card
December 15, 2012 9:15:53 AM

Use each GPU individually and re test. Its possible that one of the GPU's is downclocking, also check that out on a program such as MSI Afterburner. How are the temps going?

It might just be the new GPU causing issues.

Also, what is your PSU?
December 15, 2012 12:58:38 PM

I'm actually on a poop 650 Watt PSU (Corsair) I intend on getting a 750Watt next week, I haven't gotten any blue screens or lock ups yet though.

I just reisntalled windows 7 ultimate (Fresh HDD & Install)

40 FPS Min, 70 FPS Avg, 80-100 FPS Max on Hitman Absolution Maxxed.

50 FPS Min, 60 FPS Avg, 120 FPS Max on Farcry 3 Maxxed.

40 FPS Min, 70 FPS Avg, 100 FPS Max on Metro 2033 Maxxed.

Temps on both stay around 30-55C

Do those sound about right? Should I be overclocking my crossfire?

Going to try GTA & Crysis as those are what is giving me trouble and what I really bought Crossfire for (Since they are graphically intense)
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December 16, 2012 9:03:47 AM

Crysis 2 does not agree with Crossfire at all, it lags like hell, while a single GPU destroys it, crossfire makes it unplayable.

Same with GTA 4

Any suggestions?
a b U Graphics card
December 16, 2012 9:17:24 AM

Try downloading not new drivers, but the new profiles. I believe there was a fix for Crysis 2 CFX awhile ago. Download it and install (It should be only half a mb or something). Make sure you are using 12.11 as well.

GTA IV is really CPU intensive. And its very unoptimised for the PC.
December 19, 2012 9:27:37 AM

Sadly I cannot find 12.11 drivers for Windows 8 64 bit