Actually, the GPU should be fine as long as you're not running at uber resolutions with tons of AA.
The CPU definitly isn't fine though. It'd been determined that you'd need a ~3GHz dual-core for recommended performance. Yes I know GHz isn't a good measure of speed, but it's usually a pretty stable measurement on the same product line and related products (like Athlon and Phenom)
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CPU: Athlon XP 2100+ OC'd @ 2GHz (lacks support for SSE2)
GPU: Radeon 9600 256MB AGP OC'd @ 420 core : 200 mem
RAM: 512MB DDR + 256MB DDR
OS: Windows XP Pro SP3