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Is PCIe2 the same as PCIe 2.0

MERGED QUESTION
Question from Gadget09 : "GTX 750 ti in PCIe2"



Yes, if the motherboard does Gen3 and card does Gen2, the board will negotiate down to Gen2. As long as both are PCIE and it fits in the slot it should not be a problem.
 
MERGED QUESTION
Question from Gadget09 : "PCIe 3.0 x16 in PCIe 2.0 x16"

I have a graphics card that is PCIe 3.0 x16 (a GTX 750 ti) but my motherboard, a 760GMA-P34 (fx) only has a PCIe 2.0 x16. Will they work together?
 
MERGED QUESTION
Question from Gadget09 : "Is PCIe 3.0 x16 work in PCIe 2.0"