"ASUS P5Q Deluxe discussion".

[Leeghoofd]

you prolly need to up the FSB termination voltage to get anywhere above 4ghz , Note that this also changes the the way the GTL's need to be tweaked...
I would try to first get blend stable on 4Ghz...

First thing to check : does the rig survive Memtest 5 and 7 (via bootable Memtest CD) ?

If so enter windows and then run Blend... this needs to be at least a few hours stable... FYI small FFT only checks (mostly) just the CPU

Ai Overlock Tuner : manual
Cpu Ratio Setting : X8
FSB Frequency : 500
PCIe Frequency : 100MHz
FSB Strap to North Bridge : AUTO
DRAM frequency : 1000
_____________

DRAM CLK A1 ; A2 ; B1 ; B2 : Auto
Dram Timing Control : Manual

1st info 5 5 5 15 x 50 x x

5 5 5 15 manual
RAS to CAS Delay : 5T
RAS Precharge : 5T
RAS Activate to Precharge : 15T
RAS to RAS Delay : Auto
Row Refresh Cycle Time : 55
Write Recovery Time : Auto
Read to Precharge Time : Auto

2nd info
Auto

3rd info
Auto
_____________

Dram Static Read Control : Disabled
Dram Training : AUTO
MEM OC Charger : AUTO
Ai Clock Twister : AUTO
Ai Transaction Booster : AUTO
_____________

CPU Voltage : 1.28
CPU GTJ Voltage Reference (0/2) : AUTO
CPU GTJ Voltage Reference (1/3) : AUTO
CPU PLL Volage : 1.56
FSB Termination Voltage : 1,26V
DRAM Voltage : 2.12
NB Voltage : 1.26
SB Voltage : auto
PCIE SATA Voltage : auto

Try the above changes for Blend stability...