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ASUS P8P67 Deluxe PCI SLI question

post #1 of 2
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So I have the Asus P8P67 Deluxe with a GTX 580 and recently got a another GTX 580 for SLI. I know the motherboard has 3 PCI 2.0 16x Lanes with the third running at 4x. If I install the 2nd 580 next to the first then they will run at 8x/8x right? Also what if I install it on the bottom third express slot that is 4x, would that be bad? Would that make it run at 8x/4x? Would that be worth it for the better air flow betweent he two graphics card?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
2600k 4.6ghz asus p8p67 deluxe evga gtx 580 sli 8gb 1600mhz 
Hard DriveMonitorPowerCase
160gb intel ssd + 1tb WD black dell u3011 1000w cosair haf x 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
2600k 4.6ghz asus p8p67 deluxe evga gtx 580 sli 8gb 1600mhz 
Hard DriveMonitorPowerCase
160gb intel ssd + 1tb WD black dell u3011 1000w cosair haf x 
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post #2 of 2
Yes running in the first 2 PCIe 16x slots your 580s would run at 8x/8x. If you ran it in the first and third PCIe slots it would run at 16x/4x and while that doesn't sound much worse than 8x/8x I believe that the third 4x slot runs through the P67 chipset rather than straight to the CPU so I would definitely run them in the first and second PCIe slots. Also I don't know if you are aware but there is a three slot gap between the first and second PCIe slots so if you are running two dual slot 580s, which it looks like you are, they will already be getting plenty of air.
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Intel i7 2700k ASUS P8P67 WS Revolution EVGA 980 Ti SC+ Samsung 4x4GB DDR3 1866MHz 
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Samsung 850 Evo 1TB Samsung Spinpoint F4 2TB Samsung BD Combo Noctua NH-D14 
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Windows 10 64 bit Asus PG279Q Kingwin Lazer Platinum 1000W Silverstone Raven RV03 
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Main Rig
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 2700k ASUS P8P67 WS Revolution EVGA 980 Ti SC+ Samsung 4x4GB DDR3 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 Evo 1TB Samsung Spinpoint F4 2TB Samsung BD Combo Noctua NH-D14 
OSMonitorPowerCase
Windows 10 64 bit Asus PG279Q Kingwin Lazer Platinum 1000W Silverstone Raven RV03 
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