OCC has published a review on the Diamond Radeon HD 5750

The recent release of Dirt 2 had me itching to play and see what the cards could do as well as look at the visuals first hand. Its the little things that you notice that really make the visuals better. It would have been nice to see the game included as part of the bundle with the packaging artwork showing off a rally car as the predominant feature. Diamond has the game available on select 5 series cards, just not this one. Overclocking the Diamond HD 5750 yielded gains in performance across the board with increases of 100Mhz on the GPU core and 145Mhz on the GDDR5 memory.

Diamond Radeon HD 5750 Review