PCI Lanes - advice

[Zbrushor]

Hey guys,

I plan to build PC for GPU rendering in Octane/ 3D work. I wanted to ask, that CPU 6800k (28 lanes) has enough PCI lanes to run GTX 1080 and GTX 680 without bottleneck? Or should I go with i7 6850k (40 lanes) instead? Here are my specs:

- CPU - i7 6800k 
- CPU Cooling - Noctua NH-L9x65
- MOBO - ASUS X99 - A II ATX LGA2011-3
- RAM - Crucial Ballistix Sport LT 64GB DDR4 2400
- GPU - MSI GTX 1080 (for rendering in octane) and GTX 680 for system graphics. No SLI.
- SSD - Samsung 950 PRO 256GB M.2-2280 Solid State Drive
- HDD - 3x 3.5" 7200RPM
- Case - Corsair 300R
- PSU - Super Flower Leadex - 80Plus Gold - 750W

 

Thanks!

[Shiv78]

You can run SLI 1080s on a 6700K. You don't need X99 for 2 GPUS.

If you want X99, the 6800K will be just fine.

[Zbrushor]

27 minutes ago, Shiv78 said:

You can run SLI 1080s on a 6700K. You don't need X99 for 2 GPUS.

If you want X99, the 6800K will be just fine.

 

11 minutes ago, wrathoftheturkey said:

you can't run them both in the same system at the same time on the same program, can you? 

You'll be fine, but approaching the limit. PCIe gen 3 16x vs 8x really isn't that big of a deal anyways

I dont want them to run in SLI. Gtx1080 will be only for rendering(Octane) and gtx680 for system graphics.

[Drak3]

9 minutes ago, wrathoftheturkey said:

you can't run them both in the same system at the same time on the same program, can you? 

You'll be fine, but approaching the limit. PCIe gen 3 16x vs 8x really isn't that big of a deal anyways

Doubtful, but they plan on using the older 680 as the primary system display's adapter anyways.

[Zbrushor]

1 minute ago, wrathoftheturkey said:

You can just use integrated graphics for that m8. Besides, I'm pretty sure just running a monitor doesn't use up much GPU power at all (I could be wrong on this though)

Sorry I didn't precise. 680 will be also for photoshop 3d apps viewports and it's from my old pc so why not use it