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16x, 8x and 4x.

post #1 of 5
Thread Starter 
So almost two years ago I built myself a new gaming pc and some how missed the fact that my P8P67 LE motherboard only has a 16x and 4x slot. In the next few months I plan on buying either SLI 760s or xfire 7950/7970s depending on prices. I read somewhere awhile back that for ATI card you could get away with a 4x slot without it effecting performance too much. Is this true? I know for Nvidia cards you need at least 8x/8x. Anyone have any input on the matter?
post #2 of 5
It will have pretty much 0 performance difference at most 1-3%, nothing visually measurable. However, if you ever plan on pushing a 780 GTX Sli+ or the AMD 9970 Xfire (when it comes out), there may be a more measurable loss of performance. However, based on what your goals are you are good to go thumb.gif
post #3 of 5
x16 vs x8 vs x4 is the same as pci x 2.0 vs 3.0

it only comes down to a measurable performance difference at very high resolutions

like 5760x1080 or 4800x1200 or 3840x2160

if you are gaming on a single 1440p or lower you have no worries
    
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CPUMotherboardGraphicsRAM
I5 2500K 4.7ghz 1.36v MSI Z68A-GD80 (G3) MSI GTX 680 TFIII 4GB SLI 1248mhz core 6.5ghz mem 16GB Patriot Viper X Div 2 
Hard DriveOptical DriveOSMonitor
2xM4 64 GB Raid 0 4x5900rpm Baracuda Raid 0 Pioneer BDR Windows 7 Home Premium Triple Asus 27" monitors 
KeyboardPowerCaseMouse
Tt Challenger Ultimate Corsair AX-1200 NZXT Switch 810 Mionix Naos 5000 
Mouse Pad
Mionix Propus 380 
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post #4 of 5
Thread Starter 
I will be eventually gaming on a 120hz monitor. A long while ago. I did accidentally put my 560 ti in the 4x slot and lost about 10 - 15 fps.
post #5 of 5
Quote:
Originally Posted by igrease View Post

So almost two years ago I built myself a new gaming pc and some how missed the fact that my P8P67 LE motherboard only has a 16x and 4x slot.

Unless you use hacked, unsupported drivers, the NVidia cards won't work in SLI with 16x/4x. You need to run them at least 8x. If you read the specifications on the P8P67, you'll see that they quote Crossfire compatibility, and no mention of SLI compatibility.

If you want to keep your current motherboard, looks like you'll be going AMD/Crossfire. If you want to go the NVidia route, I'd replace the motherboard with something SLI compliant.

Greg
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