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Low Gpu Usage in Crossfire?

Tags:
  • Crossfire
  • CPUs
  • Cooling
  • Graphics
  • GPUs
  • Graphics Cards
Last response: in Graphics & Displays
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March 24, 2014 3:55:06 PM

First of All My Build:

Video Cards:HIS 7850 XFX 7850

Cpu/Cpu Cooler: FX 8320@4.4 Hyper 212 Evo

Ram:6gb

Motherboard:Gigabyte 990FXA-UD3 Rev. 4.0

PSU:Corsair GS600

1080p Monitor Resolution

One HardDrive 7200RPM and Optical Drive

Five case fans all 120mm: 3 intake( 1 Side Panel, 2 Front Panel) 2 Exhaust(Back and Top)

Running Windows 8.1

Problem:
Ive tested in Heaven Benchmark, BF3, Witcher 2, and Metro 2033 and out of the three Metro 2033 uses the most of my Gpu around 90 percent. The other three have highs of around 75 to 80 but dip down to 40s to mid 50s resulting in big fps dips.
Example:
Witcher 2 and BF3 all ultra settings 1080p

Bf3 hits 80 percent gpu usage on both cards and Im getting around 70-90 Fps average with but then usage dips down to 40-50 on both cards and I get 40-maybe 60 fps usage goes up and fps shoots up. Tested multiple games on Noshar(?) canals 64 players.

Witcher 2(ubersampling off): 45-50 percent gpu usage on average with some (very very few) highs of 80 on both cards from the beginning of the game to the first city (after you meet some elf). Ran through the same exact part of the game with single gpu its usage 99 consistent and practically the same same frames of 45 lows and averages of ~50(?)

Gpu 1 and 2 never go above 60c, and cpu runs around mid 40s. Overclocking Gpu makes usage go down and performance practically the same.

Is this normal?

TL;DR Games/Benchmark run around 50 percent gpu usage on both cards and single gpu is always 99, and when gpu usage goes up fps shoots up.

Also Cpu usage isnt ever at 99 percent when looking at all eight cores in MSI OSD normally around 60 ish. So I dont believe my cpu is bottlenecking.

More about : low gpu usage crossfire

March 24, 2014 4:15:14 PM

I am also running the latest drivers from amd and this is a brand new build.
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March 24, 2014 7:23:02 PM

So after awhile of messing around im just going to chalk it up to the games not being well optimized for crossfire.
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