6870 can barely reach 1100mhz while 5850 can go all the way to 950mhz easily, and I can tell you that 5850 will be much stronger than the 6870 in that situation.
6850 goes to 950mhz easily.. 6850 CF beats 5850CF hands down. When newer games come (tesselation), 68xx is better buy..
most importantly, it is unbeatable for price/perfomance ratio. 150€!
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