In its latest round of pre-launch testing of the Radeon HD 7950, DonanimHaber overclocked the GPU to match the clock speeds of the HD 7970, that's 925 MHz core, 1375 MHz (5.50 GHz effective) memory, from its reference clock speed of 800 MHz core, 1250 MHz (5.00 GHz effective), and pitted it against a Radeon HD 7970 reference and GeForce GTX 580 reference. Tests included 3DMark 11 Extreme Preset, and 3DMark Vantage Performance. At the outset these figures establish the HD 7950 to be faster than GTX 580 in the two tests. When overclocked to match the clock speeds of the HD 7970, the HD 7950 on average is 4% slower than it. In related news, DonanimHaber reports that AMD could also be working on affordable variants of the HD 7950 that come with 1536 MB of memory, on the same 384-bit GDDR5 memory interface. That would probably depend on how NVIDIA's lineup stacks up against it.