what fps would i get with an AMD® Athlon™ 64 X2 Dual Core Processor 3800+, integrated nVidia® GeForce® 6150 LE graphics,1024MB 667MHz Dual Channel DDR2 SDRAM [2x512], 250GB (7200rpm) Serial ATA Hard Drive with 8MB DataBurst™ cache on windows vista?

Not terribly good with a crappy onboard 6150 Lame Edition

Sounds like someones been looking at an Acer T180 base unit then?
If so, the onboard graphics are useless and the PSU is underpowered. To get good performance you would need to replace the PSU and add a decent graphics card. The Radeon x1950pro cards seem to offer the best 'bang for buck' at the moment.

Hope this helps.

ok and how much would i get on an Intel® Viiv™ technology - Intel® Core™ 2 Duo E6550 processor (2.33GHz), 256 MB ATI® Radeon® X1300 PCI Express graphics card, 2048MB 667MHz Dual Channel DDR2 SDRAM [2x1024], 250GB (7200rpm) Serial ATA Hard Drive with 8MB DataBurst™ cache als windows vista? and which is better "512MB nVidia® GeForce® 8300GS Turbocache graphics card" or 256 MB ATI® Radeon® X1300 PCI Express graphics card

Seems a nice spec, plenty of ram and a solid CPU, but the x1300 is another underpowered card. I assume that this is another pre-built base unit? In my experience base units always seem to skimp on the graphics card, unless you go for one of the really high end ones like an alienware etc.
If you go for a base unit rather than building from scratch, allow for a graphics upgrade in your budget. Also, check that the wattage of the supplied PSU can handle said card or else replacing that will add to the cost.

so what would be a good graphics card to replace it with? would a DUAL SLI 256MB nVidia™ GeForce 8600GTS graphics cards be a good one?

Quote from [106]dan :

so what would be a good graphics card to replace it with?

As has been said, the x1950pro is a good choice, and it isn't all that power hungry either. Heres an example:-

http://www.overclockers.co.uk/ ... duct.php?prodid=GX-063-OK

I have one and it does all I expect of it games wise, and should continue to do so until directx 10 becomes commonplace.

Ok Thanks