Radeon HD 7950 - Significantly worst OC then HD 7970 .. ~ OBR-HARDWARE.COM
On the HD 7950 they saved a lot and it's very visible. Cheapo PCB (less layers), only 5 GHz Hynix Mems, cheapo VRM. I am really disapointed by Ocing of that Tahiti Pro chip. HD 7970 is OC King with 1300/8000 MHz capable on air. But on HD 7950 only 1050-1100 MHz on Core and 6000-6200 MHz on Mems.