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Rampage III Extreme + 3x GPU question

post #1 of 2
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So I currently have 2x 5870 cards populating the first and third PCI-E slots - 16x/empty/16x/empty.

I recently pick up a third GPU. When reading the R3E manual, when using 3x GPUs, it recommends that I use the first, third, and fourth PCI-E slots - 16x/empty/8x/8x.

Is this configuration required? Will using the first 3 slots cause any problems, ie. 8x/8x/16x/empty?

The reason why I ask is because this is a water cooled rig. Using that 4th slot will be difficult with the Koolance full cover motherboard block I am currently using. Also if I use the first three slots, does that mean I need to plug all my monitors in the third GPU instead of the first one?

Any help is greatly appreciated!
    
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CPUMotherboardGraphicsRAM
Intel i9-7900X ASUS ROG Strix X299-E Gaming  ASUS ROG Strix GeForce GTX 1080 Ti 64GB Corsair Vengeance RGB 3200 
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2x 512GB Samsung 950 Pro M.2 Windows 10 Pro 35" Acer Predator 21:9 Corsair AX860i 
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post #2 of 2
I would think there sholdn't be a problem. It may be for heat reasons. I have had 3 cards in a row (16x8x8xempty) and didnt have any issues except for the heat on the first card. But if your under water then I say go for it.
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My lil monster
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i7 6800k Asus Deluxe ii x99 EVGA 980 ti Hydro Copper EVGA 980 ti FTW 
RAMHard DriveHard DriveOptical Drive
32GB Corsair Dominator  Samsung 840 Pro  2x 850 Pro Sony External 
CoolingOSMonitorMonitor
Custom Water Windows10 Acer x34 Predator Asus PB278Q 
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Corsair K70 Corsair AX1200i 900D Logitech G502 
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Corsair Gaming Genius SW-G2.1 2000 
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