Yeah, it's an huge improvement, but he shouldn't be wasting money on the AGP route anyways. That card's worth nothing against the mainstream solutions like the 7900gs/x1950pro's. You'll seriously regret burning that amount of money, which could have been better spent on a wholly new system.
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AMD X2 3600+@3.00|2GB Crucial Ballistix Tracer PC2-8500|evga 7900 gs (750/1780) Volt-moded|ASUS M2N32-SLI Deluxe|2 x NEC Multisync 90GX2 19"