7870 ghz vs 7870 xt

What is the difference between the above GPUs and can they become the same if you OC the cards. Also how do they stack up against the 7950.

Thanks

7870XT > 7870gHz. If you can find them, they are great. In terms of performance in relation to a 7950, they will be about 20% weaker, on average, but that depends on the game. VERY solid cards, but if you can afford it, a 7950 will be noticably better.

Thanks