looking into upgrading GPU(graphics)

Since my laptop cant upgrade because of how dell does things and its a laptop im looking into upgrading my desktop its got what i want cause of the quad core but the integrated graphics just isnt good. Anyway heres the specs:
Win7 64bit
750gb HDD
ati HD 4200 integrated 256mb
athlon II X4 630 @ 2.8ghz
4gb ddr3

now from what ive look at most cards require at least 400 watt supply which stock on the desktop is only 250 watts. looked on the web and people are saying you can get cards without upgrading the power supply but i think itll kill the computer. i was looking at the hd 6000 series with 1gb ddr3. So if i do get a graphics card im thinking i need a higher supply.

 

A solid PSU is the foundation of your build. It's the one thing you absolutely DO NOT skimp out on. The other side of the coin is that some modern graphics cards have to be plugged into the PSU, unless they solely draw their power via the PCI bus.

Are you planning to do any serious gaming, or just media like DVDs/streaming?

 

A bit of both the integrated can't do much gaming as it is. i am looking at Sapphire hd 6570 1gb ddr3

 

As long as you have an ATX tower, this would not be a poor choice and 450W should cover your butt:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182022

 

Thanks pretty sure it is an atx tower

 

its a mid size atx tower
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02479701&prodSeriesId=4269976

 

i put a 400w from my mothers since hers just needs 250w anyways but it seems when im doing something i hear the fan spinning up loud. depends if its really using the processor like gta4, WinAVI, after effects( i have 8gb ram now)

 

one thing not to forget is what power pins you need. for example main power connector. either 20 or 20+4. alos look near the cpu. which is the atx 12v. some use four six or eight. just make sure you get the right one that is compatible with your mobo. i have a corsair cx430. its got plenty of power

 

i actually just cleaned the cpu from dust has a lot since then i havent heard after effects make noise when redering

 

Of course you will get the noise "correlated with the load" you are applying on the PC. When gaming it will be loud.........damn mine is loud at idle but runs at 4.4GHz as well