NO NO NO NO NO. You really need a 64mb card, not just for gp4, but most games....unless its a top 32mb one like GF2 GTS, but TNT2s a quite old. If you can, stretch to a GF2 Ti or GF4 MX420/440. Really, it'll pay dividens later on.
'I reserve the right to contradict myself' - Richey Edwards, 1994.