I'm negative on that, the 6870 is just under the 5870, a whole category over the 5770.
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I agree with what Noir posted!
I myself got a XFX HD6870....... while it is a smidge slower/lower than the 5870 it is way better than the 5770's and it runs alot cooler than the 58xx series ( all 68xx series run cooler than the older 58xx, 48xx ) ...... however the core clock speed is right equal or a bit better with the 6870 verses the 5870......
if you want to upgrade..... go with a 6950 2 Gig Radeon VC.. BigR...... or better to 6970 or 6990........ if you want to splurge a lot......
I recommend you sticking with your CPU AMD Phen II 955 BE x4 for you will not see a major increase switching to an i5-2500........ Benchmark Reviews even did a comparison side-by-side review on these and mentioned that they were near equal in the real wold and in gameing....... if I recall correctly
If you going to switch to Intel , really go for it and get the i7-2600k and the HD6970 or HD 6990 video..... ( you should be set for about 5 or 6 years with this ROFL..... )
I myself have the AMD Phenom II 975 BE x4 and it is factory 3.6 Ghz but I can easily bump it to 4.2 /4.3 Ghz on Air and only see my temps rize 9 to 11 Degrees Clecius....
one Good Thing about it is, they are reporting that the new AM3+ Bulldozer CPUs will be able to use on AM3 MotherBoards with a Bios upgrade....... ( for some MB manufacturer's anyways )
If I was wanting to upgrade, I would wait for the BullDozer AMD CPUs to come out and become stablized ( be out for 4 to 6 months ) before switching up to them.... or I would go the i7-2600k route and get one of the topshelf MB's for this Intel 1155 chip, like the ASUS P8Z68 Deluxe LGA 1155 Intel Z68.....
just some suggestions........
good luck in your endeavors, BigR
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TC