i7-4790K and + 3 GPUS

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williamvalentin

Feb 26, 2018
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I have 3 GPUs (a GTX 1060, 1070 and a 1080), and I was wondering if it's possible to run them all at once in the same build with the CPU that I have, considering lane configuration, etc.?
They will not be in SLI, as I'll be rendering 3D in Blender Cycles.

I'm considering buying this mobo: https://www.ebay.co.uk/itm/Gigabyte-GA-Z97X-SOC-ATX-Socket-H3-LGA1150-SLi-Motherboard/263453194156?epid=219519516&hash=item3d5708b7ac:g:z1kAAOSws5BaY0tM

This is another alternative: https://www.ebay.co.uk/itm/ASRock-Z87-Extreme6-AC-90-MXGR60-A0UAYZ-LGA-1150-Socket-H3/323005645944?epid=216559658&hash=item4b34a30478:g:uJcAAOSwywRaOR2~#rwid

The 4790K supports 16 lanes, and it can do a 1x8+2x4 according Intels own website: https://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz

Would I encounter any problems, or should I be fine with either of the two boards?

Best,
William
 
Solution
theonerm2
On most cases there aren't more than 7 slots available. On the Gigabyte board there's 4 PCI -E slots that are full length. If you put a Graphics card in the top slot then slots 1 and 2 are used. 5 slots left. In The second PCI-E another graphics card uses slots 3 and 4 leaving 3 slots left. Notice how you can use the third PCI-E slot but not the 4th? In the other board Slots 2 and 3 are used for the first graphics card and 5 and 6 are used for the 2nd card. But if you have a case with 8 expansion slots it would be possible to use the last PCI-e slot for a 2 slot graphics card. There shouldn't be an issue using the cards in the motherboard but you will want to make sure your power supply is up to it.
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williamvalentin

Feb 26, 2018
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It looks to me like the physical spacing is the same?
The Gigabyte has one PCI-E lane for every second lane, whereas the ASRock looks like it has one top PCI-E lane, and then three lane distance to the next. So the physical spacing shouldn't be a problem on either of the two? But I might be wrong.
 
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theonerm2

theonerm2

Splendid
Dec 28, 2009
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On most cases there aren't more than 7 slots available. On the Gigabyte board there's 4 PCI -E slots that are full length. If you put a Graphics card in the top slot then slots 1 and 2 are used. 5 slots left. In The second PCI-E another graphics card uses slots 3 and 4 leaving 3 slots left. Notice how you can use the third PCI-E slot but not the 4th? In the other board Slots 2 and 3 are used for the first graphics card and 5 and 6 are used for the 2nd card. But if you have a case with 8 expansion slots it would be possible to use the last PCI-e slot for a 2 slot graphics card. There shouldn't be an issue using the cards in the motherboard but you will want to make sure your power supply is up to it.
 
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Solution
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williamvalentin

Feb 26, 2018
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0
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My case has 9 slots, and I have a 1200W power supply, so it should work. Thank you :)
 
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