"Upgrading the AMD Radeon HD 6950 graphics to a Radeon HD 6950 proved to be an enlightening experience. Testing the same card with multiple levels of shaders, core speeds and memory frequencies showed exactly how each of these things can have an effect in different ways. The largest gains came from completely unlocking the potential of the Radeon HD 6950 by fully flashing the BIOS, effectively turning it into a Radeon HD 6970. Each of the techniques that we used showed gains of different levels, however the biggest surprise was the minimal gains provided only by the shader unlock, which in some tests were almost non-existent..."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips