PCI Express for full 16x support intel Expansion Options

CPUs Processors Support Cpu to Gpu pci express Express Lanes 16x PCI Express Expansion Options GPUs Cpu to Gpu Expansion Options cpu to gpu bottleneck
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This is how Expansion options work for Intel

Cpu to Gpu Expansion Options for full 16x support


Expansion Options 4770k

PCI Express Revision 3.0
PCI Express Configurations ‡ Up to 1x16, 2x8, 1x8/2x4

Max # of PCI Express Lanes 16 <----

So this only has 16 lanes for the gpu and if you run 2 cards they will only have x8 lanes from the cpu to the gpus


Intel® Xeon® Processor E5-2670

Expansion Options
(20M Cache, 2.60 GHz, 8.00 GT/s Intel® QPI)
PCI Express Revision 3.0
Max # of PCI Express Lanes 40 <----

This has 40 lanes so you could run two 16x lanes from the cpu to the gpu and another gpu at 8x