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Unstable fps on HD 4650

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MadMax:
hi, i got a litte problem

well my old good 8600GT died, so had to take spare card bro bought while ago (HD 4650)

in theory it got better specs than 860GT, but in game it is rather unstable
(8600GT 256, HD4650 1024)!

example on DoubleYou
8600GT reached 92-93 fps (/fpslimit 90) and 96 with off
HD 4650 giives olny about 70-80 there (/fpslimit 90) and same values with off
moreover, in one worlds or sk where 8600GT used to give me playable framerate (60-70) this one drops to partetic 25-35 fps :S

any ideas whats wrong with it? got any good drivers or helpful tools?

musicloveR:
wait for jalicno lol

[MAF]Jur1z:
http://www.hwcompare.com/3224/geforce-8600-gt-256mb-ddr2-vs-radeon-hd-4650-1gb/

you can get driver here http://support.amd.com/en-us/download

MadMax:
already got these drivers, and as i said, thery 4650 is better but somehow i got worse results than old 8600

[MAF]Karlis:
HD 4650 should be by about 50% faster, so there is definitely something wrong here.
try to get some monitoring tools, like MSI afterburner, and check is it working on normal frequency (600MHz) and are the temperatures under 85C.

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