I just got my 9800P. With last rev of ATi drivers on default settings (balanced) I get 5612. My rig is overclocked:
2.08 T'Bred @ 2400Mhz (200x12)
RAM in sig @ 200Mhz 7,3,3,2.5
The CPU does play a bigger part than people like to think.
I noticed considerable improvement by using the ATi drivers over whatever came with the card.
Also, AGP 8x does nothing noticable for me. I ran my first tests at 4x. I think that this may be a case where the bandwidth of 4x is underutilised anyway.
Turn of 6xAA and see how your score diminishes!
AMD Mobile 2500+
A7N8X Deluxe rev2.0
1GB Corsair XMS PC2700
GeCube Radeon 9800 Pro
Seagate SATA 80GB
2xSegate 160GB in RAID0