If your friend is also running Win2k, you should have better scores while also running Win2k. Although, I have heard that Win2k has a problem with VIA chipsets, but SP1 may have fixed that since I have not heard anything on that for quite awhile.
From my personal experience: I have a Duron 700, overclocked to 900, on an ASUS A7V (KT133 chipset) with a Geforce2 MX card. The university that I work at has Gateway computers with PIII 866 on i815 chipsets with TNT2 graphics card. Granted this is a slightly lower-end graphics card but it is the best comparison I have. I am running Win2k, while the PIII systems are running Win98SE. I have never ran benchmarks on any of these computers, but just from using them, both productively and doing some fraggin', my system seems to run faster.
Really when you think about, you could actually build an AMD760 system and still spend less money than your friend spent on his PIII system. If you want to look up info on some AMD760 motherboards, try
www.tomshardware.com they have a link right on the homepage to a AMD760 motherboard roundup. Personally, I have seen such better results from my ASUS than any other motherboard I've worked with, it will take something big to turn my preference away. Of course, I must admit, four years ago I felt the same way about Aopen.