Uh oh... now you scared me...
All i did was set my advanced chipset cpu usage to "aggressive".
I have:
K7 Flagship Motherboard
NVIDIA® NForce2 Ultra 400 + MCP-T
Chipset
400 MHz FSB
Dual-Channel DDR400 Memory
Dual LAN with Gigabit
ASUS Wi-Fi slot
Dolby® Audio
SATA RAID
IEEE 1394
look at your CPU-Z, CPU tab...if it says FSB at 166, then your memory needs to be at such, not 200MHz because you're just creating a bottleneck and making the system less efficient.