The better pick: Radeon HD 4850 or Nvidia GTS 250?

[funki.fresh]

Hi guys I would to find out which one is better at performance and overall grade. I have an Antec 500w PSU 12v Smart power 2.0, amd x4 620 quad core @ 2.6ghz, 2gb ram, windows 7 32-bit, and a 24" Led monitor. I'm going to use the video card for games such as L4D and Starcraft II. I have picked these four products and I was wondering which one is the best? Thanks

Sapphire HD 4850:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102834

PNY GTS 250:
http://www.newegg.com/Product/Prod [...] 6814133266

BFG GTS 250:
http://www.bfgtech.com/bfgegts2501024e.aspx

HIS HD4850:
http://www.newegg.com/Product/Prod [...] -_-Product

the three links i provided were all 1gb 256-bit. Another question is if they're the same model(i.e gts 250) but its 512mb, how much in decrease would be in performance wise? Just a generalization. Thanks a lot

Like this one:
http://www.newegg.com/Product/Prod [...] -_-Product

Price should be the least factor for the best choice on these. Thanks a lot

[jlreich]

Looking at few different benchmarks it looks like they trade punches depending on what game you are playing.

With todays games you definitely do want 1GB memory. Having only 512MB can cut performance considerably.

[hackerballs]

Here.....go here and check the cards specs against each other..high bandwidth is good

http://www.techarp.com/showarticle.aspx?artno=88&pgno=0

[123456]

The GTS250 is slightly faster. They're similarly spec'd cards and I believe the 4850 is a little older.