Which video card?

I have 2 video cards and I don't know which onewill give me better performance or are they about equal. The one that came with my system is an AGP ATI Rage Pro 128. It has 16MB onboard memory (not 128MB as the name implies). The other is an Nvidia GeForce 2 PCI card with 64MB of memory. The AGP card has 16MB vs The PCI card with 64MB. My AGP slot is listed as 4X. Does that mean a 4X slot with 16MB is the equivalent of 4 x 16=64?.

I am running Win XP SP2 with only 128MB of RAM. I am looking to find out which card will leave more of my limited RAM for other purposes.

I would appreciate any input on this matter.

 

Well you didn't say the exact name of the PCI card so I wasn't able to check but you can look here by comparing to cards at the same time.
http://www.gpureview.com/show_cards.php?card1=&card2=