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PCI-E 16x/16x compared to 8x/8x - much gain with SLI?

post #1 of 5
Thread Starter 
Ive been looking to get the asus z68-vpro
http://www.asus.com/Motherboards/Int...specifications
and it has 2 x PCIe 2.0 x16 (x16 or dual x8)
and i thought that was fine but the i came across the rampage 3 formula
http://www.asus.com/Motherboards/Int...specifications
which has 3 x PCIe 2.0 x16 , support x16; x16/x16; x16/x8/x8 configurations

I know they are different socket types and i want to go with an i5-2500K
but is there much difference in the channels? how much performance will i lose if i go with an 8x/8x board?

Btw i am looking to SLI gtx570s
post #2 of 5
Completely negligible unless you're running benchmarks, and even then the difference is hardly noticeable. 8x8x is more than sufficient.
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Stupid Box
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post #3 of 5
In most reviews and tests the difference between x16/x16 and x8/x8 has been incredibly small, in the range of 2-6 FPS depending on the game. What matters is that the difference is so small you'll not notice any difference during actual play.
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post #4 of 5
Not to mention the bi-directional bandwidth on Asus boards.

*doubles the speed of x8 x8
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Black Pill
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Hard DriveHard DriveHard DriveOptical Drive
128Gb OCZ Vertex IV SSD 1Tb WD Gold HDD 1.5Tb WD Caviar Green HDD ASUS CD/DVD +/-RW x24 
CoolingOSMonitorKeyboard
Corsair H80i Liquid Cooling Windows 7 Ultimate 64bit BenQ XL2410T 120Hz Logitech G710+ 
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Corsair AX850w Bitfenix Ghost Logitech G600 Steelseries H4 
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post #5 of 5
Thread Starter 
Thanks so much for your replys guys. I have my heart set on the z68 so im glad this isnt shaking my decision at all. No doubt my planned gtx 570slis will destroy on my 1920x1080 monitor for a long time to come
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