Unluckily for you...It's in the "legacy" section...eep...
http://www.ati.com/products/pc/ragefurypro/index.html
Agaoin only ATi cards to support 128 MB of RAM is the Radeon series. You'll still need to upgrade to a Geforce 2 though. Also, Rage 128 is an engine, not the RAM. Much like Radeon is an engine.(That the right word..I pciked...errr..sounds wrong..)