Two GPUs on i7 8700K

[_miek_]

The 8700K only has 16 PCI-E lanes, can it handle two x16 cards and a M.2 SSD?

My system:

CPU:
- i7-8700K
Motherboard:
- MSI Z370 A Pro
CPU Cooler:
- Noctua NH-D15S
GPU:
- MSI Radeon RX 480 Gaming X 8G
RAM:
- 2x 8GB Kingston DDR4 2400MHz
Case:
- Sharkoon VG5-W
Storage:
- Samsung 970 EVO 500GB
- HP 64GB Sata SSD
- 1TB 7200RPM Sata HDD
Optical drive:
- An DVD optical drive read+write Sata
PSU:
- Cooler Master B500 v.2

I want to add a Gigabyte GeForce GTX 1080 Ti Gaming OC BLACK 11G with a Cooler Master MWE Gold 750 Full Modular, but I want to keep my RX 480 in my system. Then I would have 2 GPUs. However, the i7 8700K can only handle 16 PCI-E lanes. I know that running a GPU in x8 PCI-E doesn’t matter, but my Samsung 970 EVO is a PCI-E x4 SSD, so I would have 12 lanes left, if I would add a 1080 Ti, will it work?

Thanks already for the replies.

 

[SkyNetRising]

Only first PCIE x16 slot runs in x16 mode. Second PCIE x16 slot runs in x4 mode.

It would work, yes. Card in x4 mode would operate at significantly reduced bandwidth.
But why do you want 2 graphics cards in your system?

 

[faalin]

the top PCIe x16 slots runs at x16 while the second PCIe x16 slots only runs at x4

Your board does not allow for SLI but it will do CrossFire. You might also run into issues having a Nvidia (1080Ti) with and AMD (RX 480) in the same system with drivers as they may or may not play nice with each other.

 

[_miek_]

@SkyNetRising I want to have 2 GPUs in my system, because I want to use my RX 480 as a video encoding card, so it has a 0% impact on my gaming experience while I am recording my game. Do you think my RX 480 will run fast enough to do that?