My dell 4400 with this graphics..Help

[Chappu]

Will a dell 4400 be able to run this graphics card or is it not the right one ?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130197
Also can i mix a 512mb of ram with 256mb?

 

[vnf4ultra]

Yes, that card should work. Your system has agp (4x), and the card is agp 8x, so it should be fine(the reviews seem to indicate 4x backward compatibility). There are probably faster cards in the same price range that would work as well, but you may not need a faster card, depending on your intended usage.

Also, yes, it's ok to mix the 256 with the 512mb.

Here're your system specs for reference.
http://support.dell.com/support/edocs/systems/dim4400/specs.htm#1101572