By the way, currently I have 4670 GPU, run PCI-E 1.1 x16 (32MH/s with 750MHz > 800MHz clock using cgminer).
So, if I move GPU to motherboard that capable PCI-E 2.0 x16, dose Hash rate will increase? i think not
You are correct, It would not. Bandwidth on the PCI bus does not help hash rate.
For BTC sha256 yes.