System 1:
Asus A7M266-D
2 x Athlon MP 2000+
1024 MB ECC PC2100 DDR ( 2 x 512 MB )
VisionTek GeForce 2 MX 400 32MB
Intel Pro/1000 MT NIC
Adaptec SCSI RAID 2110S Controller (in 64-bit PCI slot)
3 x Seagate ST318452LW 18.4 Ultra160 SCSI HDD in RAID 5

CPU: 4702
MEM: 2681
HDD: 1062

System 2:
MSI K7D Master
2 x Athlon MP 2000+
1024 MB ECC PC2100 DDR ( 2 x 512 MB )
VisionTek GeForce 2 MX 400 32MB
Intel Pro/1000 MT NIC
Adaptec SCSI RAID 2100S Controller (in 32-bit PCI slot)
3 x Seagate ST318452LW 18.4 Ultra160 SCSI HDD in RAID 5

CPU: 4792
MEM: 2520
HDD: 738

Tested with clean, default Windows 2000 Professional install + SP3. On board sound, secondary IDE controllers disabled in BIOS - I can't remember if I disabled any serial/parallel ports, but it would be the same for each board.

I guess a 64-bit PCI slot makes a big difference, but the SCSI controllers are slightly different - the 2110S is half height, the 2100S is 32-bit only. I don't think the benchmark cares about the second CPU either.