Best graphics card for my comp

[gdon12]

hey i have a Gateway Official Site: Shop - Desktops – LX6200-01 Product Details - LX 6200 01 Product Details
(Nothing has been changed) I would like to know what would be the BEST graphics card for this comp with only a 400 W power supply, im a moderate gamer, I bought this computer because it was on Sale and it came with a 22inch screen for only around 700$. my Budget is about 175$ I was thinking of
Ati 4670 Newegg.com - HIS Hightech H467QT512P Radeon HD 4670 IceQ Turbo 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards Or the Newegg.com - ZOTAC ZT-96SES4P-FSL GeForce 9600 GSO 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards
Im a little new at this, so if you guys can find a better one that is compatible with this computer then it would be much appreciated and if you cant then please tell me which 1 of the 2 would be better. (I wasnt planning on buying a new power supply because that would cut out my budget.)
Thx for the help
Btw if i did decide to buy a power supply for my comp what would u guys recommend?

 

[veg1992]

At stock both are tied speeds...

however that HD 4670 is OC'ed and comes with an aftermarket cooler, consumes less power and doesn't need an external power connector (which is good b/c Gateway gives the bare necessity for their rig's PSU's)

So go with the HD 4670, but those cards are suited more towards a 1440x900 Res, so you would be better with a 19'' monitor

 

[gdon12]

So theres no way of me getting a better graphics card with a 400w power supply?

 

[veg1992]

Unless you replace the PSU, pretty much yes..

All brands, Gateway Dell etc.. give PSU's that are a little more than enough to run the given rig... so most likely your PSU won't support more than that.. (btw watts don't matter.. amps on the 12v rails do)

 

[gdon12]

amps on the 12v rail? How do i determine how much my comp has? How much will it cost to get a better one, to support better graphics card then what i have stated above. Sorry about all the question im a Noob at this