I have a ATI 6870x2 2G crossfired with a xfx 6870 2g. The problem is my computer runs way faster with just running off the x2 card. Also i notice that games like BF3 take up my full CPU usage in BF3. So i limit BF3 to 4 cores on my 1100T CPU and it runs at 50 to 30 fps so my usage goes down to 60 percent. But if i turn on all three cards it runs at 25 FPS. So is my CPU the problem im running this build on A corsair TX850M power source. I also notice in game when im running 3cards usage never goes over 60 percent eventhough the game is running like crap but if i use only the X2 card usage is at 80 Plus usage. So what the hell is going on?
Originally posted by: awi5951 I have a ATI 6870x2 2G crossfired with a xfx 6870 2g. The problem is my computer runs way faster with just running off the x2 card. Also i notice that games like BF3 take up my full CPU usage in BF3. So i limit BF3 to 4 cores on my 1100T CPU and it runs at 50 to 30 fps so my usage goes down to 60 percent. But if i turn on all three cards it runs at 25 FPS. So is my CPU the problem im running this build on A corsair TX850M power source. I also notice in game when im running 3cards usage never goes over 60 percent eventhough the game is running like crap but if i use only the X2 card usage is at 80 Plus usage. So what the hell is going on?
Running 3 cards off an 850W PSU is not the best setup. I suspect your PSU is sweating hard with 3 video cards.
AMD rigs are best off with a 2 way CFX/SLI as 3 cards will bottleneck
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Corsair Carbide 300R, Asus M5A99FX PRO R2.0, Phenom II 965 C3 BE, G.SKILL RipjawsX DDR3-2133 8 GB, GTX 260 SLI, Asus PA238QR, TX850V2, Windows 7 x64 Enterprise
Asus M4A77D, Athlon64 X2 4200+, DDR2-800 6 GB, HD 5450, cheap 450W, Server 2012
Originally posted by: awi5951 I have a ATI 6870x2 2G crossfired with a xfx 6870 2g. The problem is my computer runs way faster with just running off the x2 card. Also i notice that games like BF3 take up my full CPU usage in BF3. So i limit BF3 to 4 cores on my 1100T CPU and it runs at 50 to 30 fps so my usage goes down to 60 percent. But if i turn on all three cards it runs at 25 FPS. So is my CPU the problem im running this build on A corsair TX850M power source. I also notice in game when im running 3cards usage never goes over 60 percent eventhough the game is running like crap but if i use only the X2 card usage is at 80 Plus usage. So what the hell is going on?
Running 3 cards off an 850W PSU is not the best setup. I suspect your PSU is sweating hard with 3 video cards.
AMD rigs are best off with a 2 way CFX/SLI as 3 cards will bottleneck
Well it really is kind of 2 cards one card is a big x2 dual card lol.
black_zion Heavy Wizardry
Posts: 9742
Joined: 04/17/2008
Your power supply isn't an issue, even if they were to somehow draw 550w, which is beyond what an overclocked setup would be, you'd still have 250w to spare before even worrying about pushing the SeaSonic made unit to the limit.
It depends on your resolution as well, 1920x1080 and above are more GPU limited than CPU.
Me I would use the single dual GPU card and divest of the other card to the junk box
i dislike 2-way and 3-way mashups as the rig tends to sit there spinning its wheels
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Corsair Carbide 300R, Asus M5A99FX PRO R2.0, Phenom II 965 C3 BE, G.SKILL RipjawsX DDR3-2133 8 GB, GTX 260 SLI, Asus PA238QR, TX850V2, Windows 7 x64 Enterprise
Asus M4A77D, Athlon64 X2 4200+, DDR2-800 6 GB, HD 5450, cheap 450W, Server 2012
Originally posted by: black_zion Your power supply isn't an issue, even if they were to somehow draw 550w, which is beyond what an overclocked setup would be, you'd still have 250w to spare before even worrying about pushing the SeaSonic made unit to the limit. It depends on your resolution as well, 1920x1080 and above are more GPU limited than CPU.
your dual GPU card will be well served by the 1100T, 3-way provides diminishing returns.
I use a more modest 965 BE, which was the flagship at one time long ago.
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Corsair Carbide 300R, Asus M5A99FX PRO R2.0, Phenom II 965 C3 BE, G.SKILL RipjawsX DDR3-2133 8 GB, GTX 260 SLI, Asus PA238QR, TX850V2, Windows 7 x64 Enterprise
Asus M4A77D, Athlon64 X2 4200+, DDR2-800 6 GB, HD 5450, cheap 450W, Server 2012
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03/18/2013 04:26 PM
