Thinking of buying a new GPU

Here are the ones I'm interested in. Basically a 3650.

http://www.newegg.com/Product/Prod [...] 0-%20%2475

And I was wondering, the cheapest video card listed asks for a 500W power supply and another one asks for a 300W power supply. Do the same cards really ask for different power or is it the card creators (like Sapphire and VisionTek, not ATI) that just want to play it on the safe side?

well, if it must be a 3650, then i'd go with either HIS or Saphire
HIS because ive owned two HIS 3870s for almost a year now and have been performing rock solid... but on the other hand mine are iceq3 turbos....
4670=
http://www.newegg.com/Product/Prod [...] 6814161252
4650=
http://www.newegg.com/Product/Prod [...] 6814102829

dont get an old 3650, you will most likely be dissapointed with your purchase. and a 4650 would probably mope it for close to the same price, and a 4670 is close to a 3870

he needs an AGP card, or at least thats what he linked. Besides the AGP 4650 is $100, its highway robbery for agp card prices now.

well...they trying to play it on the safe side, but it all depends on your other hardware, thats why should you know your video-cards actual power-consumption and your other hardwares power requirements and that should give you a more accurate number for a PSU.