4870x2 is out on 15th august.
if you can edit two lines of a text document ur 4870x2 will run at 50 celsius.
2 4870x2 will kick 2 gtx 260 @sses in games the scale and probably still beat them in games that dont scale well at all.
1, 4870x2 - or 2, 4870x2 if you plan to get a 30" display.
read benchmarks and draw your own conclusions about any other details that matter to you. But gtx260 doesn't remotely compare to a 4870x2 on price, performance, thermals, or really much of anything.
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