I currently have a Sapphire Vapor-X Radeon HD 7770 installed from February and was wondering if I should buy another and Crossfire or buy something new like a 7870 LE.
7870 LE all the way... very nice cards indeed. Also will be less heat than a crossfire setup, & a 7870 le will overclock quite high (although I would probably go with a different brand if you can if you really wanna push it hard). Hope it works out for ya mate,
a 7870 le is s 7950 that didn't make the cut, unless it's much cheaper (it was for quite awhile) then you'd be mad not to get the 7950, especially when not many manufacture's make Tahiti le cards and the ones that do don't have very good reputations
No a 7870XT overclocked to the max gets close to a stock HD7950 and then a HD7950 overclocks to stupid fast speeds and is only 2-4fps away from a overclocked HD7970 (as you can see above all the cards there have been overclocked and benchmarked)
Youed be crazy to buy a XT when you can get a HD7950 cheap and thay are selling out fast.