Here is some more info, sorry for the double post. I have 2x1gb Crucial Tracer DDR2-800, which have been running in my amd rig at 500mhz at 5-5-5-18/2.2v for a few months now without a hitch, and I have never bothered to tweak the timings lower. My psu is a OCZ Stealth 600w. My CPU is a X6800 ES, Stepping 6, B2 which has been known to do 4ghz on other mobos. Here is my setup:

Code:
ASUS P5Q DLX Template : 

JumperFree Configuration Settings 
AI Overclock tuner: MANUAL 
CPU Ratio Setting: 11
FSB Strap to North Bridge: 266 
FSB Frequency: 266
PCI-E Frequency: 10 
DRAM Frequency: 800 
DRAM CLK Skew on Channel A1: AUTO 
DRAM CLK Skew on Channel A2: AUTO 
DRAM CLK Skew on Channel B1: AUTO 
DRAM CLK Skew on Channel B2: AUTO 
DRAM Timing Control: AUTO 

DRAM Static Read Control: Disabled 
DRAM Read Training: Disabled 
MEM. OC Charger: Enabled 
AI Clock Twister: Moderate 
AI Transaction Booster: Enabled, at 8 (default)

CPU Voltage: 1.325 
CPU GTL Voltage Reference (0/2): .67x
CPU GTL Voltage Reference (1/3): .67x 
CPU PLL Voltage: Default
FSB Termination Voltage: Default 
DRAM Voltage: 2.2v 
NB Voltage: Default 
NB GTL Reference: .63x 
SBridge Voltage: 1.1v 
PCIE SATA Voltage:1.5v 

Load Line Calibration: Enabled 
CPU Spread Spectrum: Disabled 
PCIE Spread Spectrum: Disabled 
CPU Clock Skew : Normal 
NB Clock Skew : Normal 

Advance CPU Settings 
CPU Ratio Setting: Manual 
CPU VID: Default 
C1E Suppport: Disabled 
Max CPUID Value Limit: Disabled 
Intel® Virtualization Tech: Disabled 
Vanderpool Technology: Disabled 
CPU TM Function: Enabled
Execute Disable Bit: Disabled
Thats my stock setup. If I try to do 400x7 with memory at 800, it never works at stock voltages. I've tried bumping up the voltages for the nb/sb little by little, but that never helped and I didn't want to go too high. Any help? A filled out template for me to try would be great... *hint hint*. Oh, and the default values for the voltages are not the "auto" setting, they are just the default voltage that I could not remember off the top of my head.