Connect NIC1 to NIC2 on same PC (VMs)?

[lordsegan]

So I am playing with ESXi and it occurred to me -- I could pass various 10GB NICs I have to different VM machines and then connect the NICs physically to each other using short DAC cables.

If I did that, would there be any issues I should be aware of? Would they operate faster, or would a vSwitch offer better 10GB speeds between VMs on the same host?

Thanks