See if http://www.Barefeats.com did some tests of apps.
The 5870 still holds its own in many tests, not sure about cost.
Anything does better on 2009 and later even though they are supported on 2008.
Better tips on how to optimize and what to do, performance, would be
Like putting your L4/5 Catlogue on SSDs on a Sonnet Tempo Pro using a pair of 500GB ($319) SSDs.
Nothing on the system drive but OS and never being used as scratch (a lot of apps will try to).
The 'health' of the SSD, being TRIMMED, free space, even restored as necessary, as just general maintenance and housekeeping.
Beware of marketing hype, and while the lag time for compilers and engineers and software to use hardware to its best advantage
SHOOTOUT WITH THE 'SHARKS': Sapphire Radeon HD 7950 for Mac versus "big fish" GPUs (Added full results for the Quadro K5000 and a flashed Radeon HD 7970.)