The rage 128 (16mb) seems to work acceptably with UI2. It's a bit choppy when first opening the menu, but smooths out. I'm guessing the 32mb version of the card would help a bit, as would more CPU.
I did also try UI3 with my 7200gs (128mb) , and while it DID work, it was also choppy. CPU is a d820 Pentium @ 2.8ghz, 2gb ddr2, so I'm thinking that the 7200 is barely powerful enough to run the alpha blending.