The EZ?s will still be a decent performing card -- they are faster than the standard 9600 325/200 DDR which I consider a decent card. You should be able to run 8AF in most games and even some AA some of the time.
The memory is probably 4ns ? usually overclocks to ~ 250.
The core, since it has active cooling should get up to around ~ 475 ?give or take 20Mhz.
At ~ 450/250 you would be very close in performance to a 9600pro.