What Mainboard/CPU for GPU Passthrough

Hey,

what Mainboard and CPU is the better choice for GPU Passthrough on LGA1151?

CPU:           Intel Xeon E3 1270v5
Mainboard:     ASUS Z170-A
GPU:           1x Nvidia GTX1080 1x GTX 690

or

CPU:           Intel i7 6700
Mainboard:     ASUS Z170 WS
GPU:           1x Nvidia GTX1080 1x GTX 690

Both CPUs and Mainboards have VT-d and VT-x
But the

    Z170-A  have x16/x8  - PCI-E: 2 x PCIe 3.0/2.0 x16 (x16 or dual x8) 
    Z170-WS have x16/x16 - PCI-E: 4 x PCIe 3.0/2.0 x16 (single at x16, dual at x16/x16 mode, triple at x16/x8/x8 mode or quad x8/x8/x8/x8 mode)

or works GPU Passthrough with x16/x8 and x16/x16? but i think on the Z170 WS it runs both gpu with max speed.

The board matters only becuse of the drivers available. You'll never going to saturate a x8 PCIe connection with any GPU ever made till now. What matters in the first place to be able to do GPU passthrough is the CPU and both the CPU you chose are capable of it. The WS board has a PLX chip that multplies the CPU PCIe lanes because both CPUs just have 16 lanes so migh even lead to worst performance.
To recap things you're good with both boards.

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You can't use v5 CPU's on the Z170 chipset. Intel restricted the microcode to C series chipsets. The v1, v2, and v3 E3 Xeons did not have this restriction. You will need a C232 or C236 based board in order to use a Xeon E3 v5 processor.

jea see it can't use the xeon with z170

so what are you think:

Asus Z170-A    and  Intel i7 6700k
Asus x99-A II  and  Xeon E5-2620 v4   or   Xeon E5-1620 v4   or   i7-6800k

i need new cpu for Rendering 3D Models, Video editing and Play UBI/EA Games in the VM with GPU Passthrough.

2011-3 CPUs are recommended for passthrough. They generally support proper IOMMU group isolation so you won't have to apply the ACS kernel patch.

ok then i buy the x99 but what for an cpu are you think is the better option for rendering and gaming?

i7 6800k
Xeon E5 2620 v4

i plays 3-4 games max and think i fuckk off the gpu passthrough an buy an i7 6700k and asus z170-a mainboard and save money

I'm not familiar with your rendering software or rendering in general. Do you benefit from having more than 6 cores/12 threads? That being said the 2620 v4 is clocked so low that the 6800K would probably still outperform it.

For sure if you drop GPU passthrough it would remove much of the potential hassle.

Looks like 6700k supports VT-d

If later you decide to try passthough it probably will still work. You just might need to patch the kernel.

so i buyed an i7 6700k and z170-a

when passthrough not work ok then not and i play not the ea or Ubi games that not my problem, thats the problem from UBI and EA when they are not make an game for linux.

I Use Autodesk Maya and MODO for 3D modelling under Manjaro Linux ^^