AMD phenom 9550 and ATI 4870

Can some1 answer? Please

you are going to want to have at least 3.0 on that CPU or higher, so you'll need to OC or get a new CPU (possibly an AMD 64X2 6000+ @ 3.1) in order to use the full potential of the 4870...

The 4850 1gb is a great card

for the most part it will be better than the 512mb version
although this will only make a difference realy if accompanied by a 24" or above monitor.

any thing bellow 22" monitors dont require 1gb of vga memory, though this may change in the near future.

as long as the price is right, and u dont plan on replacing the GPU often (otherwise a waste of the extra cash in conjuntion with the time release of the 1gb requirement of games as a standard), then 1gb hd4850 will be perfect.

also 2 in crossfire is spectacular, especially as most game from now on will cater for dual graphics as standard.

Can somebody answer please?
But will 4850 1Gb work in its full potential just like 4850 512Mb on my CPU or not?

no your computer wont freeze it will work perfectly and your cpu isn't nearly as much of a bottleneck as these enthausiasts try to claim. even on a athlon x2 you would get the benefit out of the radeon 4870. i dont think you will even notice anything running intensive games sure with a faster corei7 or core2quad cpu a you might get a few frames more but this is an overkill costwise and not even worth considering since you already have a well build system Phenom 9550 isn't a slow cpu at all it is way faster then athlon x2. i recommend to get the card and carryon with you cpu and might upgrade it somehwere late 2009 or 2010 once the lastest phenom models are launched before they step up to another Socket this is the cheapest way to and will squeeze out as much as possible out of your current system.

You mean old "thread"