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Thank you very much for answers.
Actually i have a 512 MB and 256 MB memory modules, however now I am considering purchasing another 512 stick for dual channel.
to almerac: I guess you assumed that my current video card is 6600gt, however it's GeForce MX 440
I have 300w PSU, however I am planning to connect additional 250w PSU once I get a new card.
I will try to find out whether I can get 6800 xt in my country as it does not seem to be a popular chipset. Otherwise 7600gt sounds very apealing to me and if noone will object that my cpu is way too slow to handle it I probably should purchase it.
Of course, 6600GT is also a safe bet..
do you plan on running dual PSU's? if you are, it isn't a problem, mostly just an issue of where to put the other PSU in or around your case, they make dual 20/24 pin cables so you can hook them both to the motherboard so they turn on at the same time.
i had a geforce 4 MX 440 a long time ago ^_^ they overclock really well, was even playing rome total war on it for a bit, what got me was the lack of pixel shaders that left me stuck in the mud on so many games i wanted to play.
ok if you buy anything, please dont buy the 6800XT, ok with ATI "XT" is equal to "GT" for nvidia, and (ATI) "SE" is equal to "XT" (Nvidia), and "XTX/pro" (ATI) is usually around "GTX" (Nvidia). now this doesnt mean every ATI "pro" card is better then any GT or XT card. what it does mean is that those suffixes are used to denote the relative position of that card in that line. example being the slowest to fastest 6800 cards are (in this order)
6800XT, 6800GS, 6800, 6800GT, 6800 Ultra
and in reality a 6800XT is the very bottom of the bucket of 6800's, and is often beaten by a 6600GT. and neither is really worth the money these days. honestly do yourself a good favor, and don't buy a 6800XT even if it looks like a good deal, it is a bastard card (forgive my adjective) and many hold that simply buying that card, is an example of ones own ignorance and willingness to piss your money away. now yes it might be "ok" to play most modern games at 800/600. but i can tell you you cant possibly go lower then a 7600 series geforce and expect good performance, short of a couple of 6800's in SLI (dont even think about using two XT's tho) in modern games, and your processor will be ok. again i would recomend a 7600GT (even a GS would be a good deal, considering they have SM3, and are cheap, and overclock like mad), or a X1950pro, that way, when you do look to upgrade again, you dont have to look at your system and wonder if your CPU is bottlenecking, because it will probably hold a X1950pro back a little bit, but that wont matter because it will likely amount to 2 or 3 FPS. but you will not have to worry about your computer again. and next time you just do a total system rebuild, as opposed to getting a 6800 now, then six months from now realizing that its not hacking it with new games, even on low settings, then you have to buy either another video card, or build a new system. 6800's will simply not hack it for much longer and a XT wont hack it even now. games like oblivion are simply painful, or unplayable on anything lower then then 7600 series. and btw a 7600GS is right between a 6800GS and GT, and a 7600GT beats a 6800 ultra hands down.
sry for the long post but i hope it qualms all your concerns. but please please please, do not buy an XT. anyone that says you should does not really know what they are condemning you to.