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PCI Express for full 16x support intel Expansion Options

This is how Expansion options work for Intel

Cpu to Gpu Expansion Options for full 16x support

http://ark.intel.com/products/75123/Intel-Core-i7-4770K...

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

http://ark.intel.com/products/64595/Intel-Xeon-Processo...

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
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