I am TR but sometimes I login as a NC and figured out this today... Never saw something like this at TR warpgate. HD7950 13.2 Beta 5 W8 x64 Fresh useroptions.ini, default high settings and v-sync on (tried off, too)
They have broken DXVA among some other things in 13.1, OpenCL isn't detected properly in 12.11 Beta 11, earlier 13.2 Betas are generally unstable. So, what the hell to do? At least they aren't going to make/sell any new cards this year so, hopefully, they have this whole year to finally make decent drivers for HD79xx series.