I want to upgrade my videocard i have a TNT/2 32MB right now but it's power is too limited, getting frame rates of 7FPS seems to occur right when im being shot at, and need my 30FPS the most. i am thinking of perchasing a 550Mhz k6/2 for my system to boost the performace a bit, but im not really sure if that will have great effect. i at one point bought a TI/500 and my mobo didn't have enough voltage (thanks for the help flying penguin). so i am in fear that a geforce 2 pro will complain on the voltage as well

what would be a good replacement for my trusty TNT/2?
here are my systems specs:
generic midtower AT case w/200W PSU
DFI K6BV3+/66 socket 7 mobo
333Mhz AMD K6/III @ 400Mhz
160MB ram
TNT/2 AGP vidcard
SB live 5.1
ISA creative modem blaster 56K
Linksys LNE100TX Fast Ethernet Adapter
8X8X32 burner and 48X cdrom