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Crossfire Issues. 2xHD6950

post #1 of 3
Thread Starter 
Hello, my brother is having some problems with his PC that I just can't get my head around. The problem is that when he's running with both his 6950's in crossfire he has a small FPS drop in all games. And if I take out one of the cards ( doesn't matter which ) he gets up to the normal FPS again. I've tried everything i could think of to fix it and I am stuck. Wiped the HDDs and reinstalled windows with all the updated drivers for every component, enabled and disabled VSync, and still the same issues. The two main games that he plays are WoW and Black Ops, and the problem occurs in both and is easily noticable. Can anyone please try to point me in the direction of what is causing this problem? His PC setup is listed below.


Hardware:

GPU : 2x - XFX Radeon HD 6950 1GB GDDR5
Motherboard : 1x - ASUS Corsair IV Formula, Socket-AM3
CPU : 1x - AMD Phenom II X6 1090T Black Edition
PSU : 1x - Corsair HX 750W PSU
RAM : 4x - Kingston ValueR. DDR3 1333Mhz 4gb, CL9

Driver details:

ATI Cross-Fire Driver v.11.6
Windows 7 64-bit Catalyst v.11.7
post #2 of 3
Overclock that CPU and tell him to run the 11.2 drivers, Best Crossfire drivers released by far smile.gif

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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 2 x6 1075T 5.5Ghz ASUS Crosshair 4 EXtreme GTX 470 SLI OCZ Reaper DDR3 1600Mhz CL7 
Hard DriveOSPowerCase
WD Carvier Black 1.2Tb RAID 0 Windows 7 Ultimate x64 1000w Modular Coolermaster Cosmos S 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 2 x6 1075T 5.5Ghz ASUS Crosshair 4 EXtreme GTX 470 SLI OCZ Reaper DDR3 1600Mhz CL7 
Hard DriveOSPowerCase
WD Carvier Black 1.2Tb RAID 0 Windows 7 Ultimate x64 1000w Modular Coolermaster Cosmos S 
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post #3 of 3
I have Black Ops for PC and also 2x 6970s, but 2 cards will have no impact on performance for that game (i'm not too sure about WoW).

What do you mean by small FPS drop? Is it a stutter does the actual FPS goes down?

Edit: Another person posted this, "No, don't do it, not with an x4 slot. That slot is most likely running through your south bridge and not through your northbridge like the x16 slot, so you will get noticeable stutter in games and benchmarks. I've tested it before myself and the difference between x16,x4 and x8,x8 is astounding."
Edited by maTyaR - 8/2/11 at 7:56am
Awesomeness
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7-3570K @ 4.3Ghz @ 1.09 Vcore ASUS Z77 Sabertooth Gigabyte GTX970 G1 Gaming  Corsair CMZ8GX3M2A1866C9 
Hard DriveHard DriveOptical DriveOS
WD2003FZEX Crucial M500 480GB ASUS DVD-RW 24X Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
ASUS VE248QE 1920x1080 Logitech G110 Corsair 850TX NZXT Phantom White 
MouseMouse Pad
Microsoft Intellimouse 3.0 (X01 Early Gen PCB) X-Ray Technology Aqua 3 Large 
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Awesomeness
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7-3570K @ 4.3Ghz @ 1.09 Vcore ASUS Z77 Sabertooth Gigabyte GTX970 G1 Gaming  Corsair CMZ8GX3M2A1866C9 
Hard DriveHard DriveOptical DriveOS
WD2003FZEX Crucial M500 480GB ASUS DVD-RW 24X Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
ASUS VE248QE 1920x1080 Logitech G110 Corsair 850TX NZXT Phantom White 
MouseMouse Pad
Microsoft Intellimouse 3.0 (X01 Early Gen PCB) X-Ray Technology Aqua 3 Large 
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