im looking to replace my gtx 260 and im thinking of ethier the ati hd5830 or the 5850 there about 40 quid diffrence but i have a few puzzlers. i was wondering if the cards have full sound support over hdmi would i be able to play my games in 5.1 sending the signal to my onkyo txsr608 i cant do that at the minute with the audigy 4 and also is there any diffrence with diffrent makes xfx sapphire wat ever theres another 40 in the makes
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Get a 5850 if you want to see a jump in performance.
The 5.1 has nothing to do with the card itself, if you want to connect your sound system to the PC you will need an audio card with an optical output.
a gtx480 will give you all the heat you want, literally and figuratively speaking...