Is pcie 2.1 x16 graphic will slow if in pcie 2.0 x16 slot?

ati radeon hd6990 has a pci-e 2.1 x16.So, will the ati radeon hd6990 run slow in pcie 2.0 x16 slot ?|||No...the 2.0 and 2.1 have the same 5GT/s speeds. The 2.1 has some overhead telemetry that will ready the socket to Take 3.0 when it comes out.|||No, PCIe 2.0 x16 and PCIe 2.1 x16 is the same, both have the same speed.|||No

ATI/AMD likes to add pointless .1 support even though it does nothing for anything|||Yes, bit you will never notice the difference.