Need help with HD 4770 Videocard

I just bought a new PC last month, but I'm still using intel onbroad videocard. I'm thinking HD4770 for GW1 and future GW2... but I dunno if my computer can handle HD4770 videocard. Can anyone help me out?

This is roughly my pc info.
Dell
Inspiron545
Intel(R) Core(TM) 2 Duo CPU [email protected] 2.8GHz
Ram 4.00GB
64bit operation system
350W

I first thought about buying 4800 series videocard, but was told those consume a lot of power. So will HD4770 work on my PC? or I have to go a bit lower like HD4650?

I saw on NCIX website XFX Radeon HD 4770 750MHZ 512MB 3.2GHZ GDDR5 Dual DVI TV Out PCI-E Video Card Its 124.99$ CND, does it look like a fine deal? Can anyone generally give me any advices? I would be greatly appreicated. Thanks

Sapphire lists their HD4770 as requiring a 450watt power supply.(ATI/AMD doesn't seem to list the req.)
The HD4650 is listed as requiring 400watts, but you may be able to get away with it.
You may have to go all the way down to an HD4550 to work with a 350watt.

You might want to consider upgrading the power supply too.

I know people that run a 4670 on a 350 watt system, but I wouldn't advise it. Generally speaking the lower powered PSUs that come in major manufacturers PCs are not the best of quality when it comes to stressing them with dedicated video. If you can afford $50 for a decent mid range Power Supply, that would be your best bet.

the 4770 is a sweet card, it would handle GW1 and GW2 for sure.

The specs list the HD4770 as using up to 80W, pretty sure you'll get by fine on most 400w PSU's, if you read any hardware review, total system power needed to power an hd 4770 doesnt even surpass 300watts using i7 920 rigs during load, and that's total SYSTEM power.