Will a PCI Express x16 3.0 card work in a PCI Express x16 slot?

compatibilitypci-express

I have a motherboard with a PCIexpress x16 slot.

I want to purchase a card called AMD Radeon HD 7770, which uses PCIe version 3.0.

Is that backwards compatible?

Best Answer

Quoting wikipedia:

PCI Express 3.0 Base specification revision 3.0 was made available in November 2010, after multiple delays. In August 2007, PCI-SIG announced that PCI Express 3.0 would carry a bit rate of 8 gigatransfers per second (GT/s), and that it would be backward compatible with existing PCIe implementations.

Emphasis is added.

So yes, the card will work in the slot, but as nerdwaller mentioned, you may not get full performance depending on the resolution or framerates you're aiming for.