Advice: Don't use 3DMark03 has a benchmark - it's really really dodgy. Rather use in-game benchmarks, like UT2003 or BF1942, and even 3DMark 2001SE if you need to. Aquamark is also a good test, but stay AWAY from 3DMark 03.
Anyway, I'm sure you will notice an improvement in games at high detail/resolution.
Thanks for the update
Who's General Failure and why's he reading my disk?