Reaching higher, what to do next? i7-920 @ 4.5ghz???

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Auto, along with everything else not listed in my original post.

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set IOH to 1.4 or something. It might not do it automatically, i needed 1.4 or so IOH to get to 4.5

-EDIT, Maybe this little guide will help the next person get somewhat stable @ 4.4ghz on air with a ASUS p6t...

Here is my complete settings stable @ 4.410mhz in my bios:

JumperFree Configuration Settings......

AI Overclock tuner: Manual
CPU Ratio Setting: x21
Intel (R) SpeedStep (TM) Tech: Disabled
Intel (R) Turbo Mode Tech: Disabled
BLCK Frequency: 210
PCIE Frequency: 200mhz
DRAM Frequency: 1680mhz
UCLK Frequency: 3360 (twice the Dram Freq)
QPI Link Data Rate: Auto

DRAM Timing Control......

1st Information :

CAS# Latency: 8
DRAM RAS# to CAS# Delay: 8
DRAM RAS# PRE Time: 8
DRAM RAS# ACT Time: 24
DRAM RAS# to RAS# Delay: AUTO
DRAM REF Cycle Time: AUTO
DRAM Write Recovery Time: AUTO
DRAM Read to Precharge Time: AUTO
DRAM FOUR ACT WIN Time: AUTO
DRAM Back-To-Back CAS# Delay: AUTO

2nd Information :

DRAM Timing Mode: 2N
DRAM Round Trip Latency on CHA: AUTO
DRAM Round Trip Latency on CHB: AUTO
DRAM Round Trip Latency on CHC: AUTO

3rd Information :

DRAM WRITE To READ Delay (DD): AUTO
DRAM WRITE To READ Delay (DR): AUTO
DRAM WRITE To READ Delay (SR): AUTO
DRAM READ To WRITE Delay (DD): AUTO
DRAM READ To WRITE Delay (DR): AUTO
DRAM READ To WRITE Delay (SR): AUTO
DRAM READ To READ Delay (DD): AUTO
DRAM READ To READ Delay (DR): AUTO
DRAM READ To READ Delay (SR): AUTO
DRAM WRITE To WRITE Delay (DD):AUTO
DRAM WRITE To WRITE Delay (DR):AUTO
DRAM WRITE To WRITE Delay (SR):AUTO

CPU Voltage: 1.4000
CPU PLL Voltage: AUTO
QPI/DRAM Core Voltage: AUTO
IOH Voltage: AUTO
IOH PCIE Voltage: AUTO
ICH Voltage: AUTO
ICH PCIE Voltage: AUTO
DRAM Bus Voltage: 1.66v (bios won't let me set to 1.65v)
DRAM DATA REF Voltage on CHA: AUTO
DRAM DATA REF Voltage on CHA: AUTO
DRAM DATA REF Voltage on CHB: AUTO
DRAM DATA REF Voltage on CHB: AUTO
DRAM DATA REF Voltage on CHC: AUTO
DRAM DATA REF Voltage on CHC: AUTO

Load Line Calibration: Enabled
CPU Differential Amplitude: AUTO
CPU Clock Skew: Delay 300ms
CPU Spread Spectrum: Disabled
IOH Clock Skew : Delay 300ms
PCIE Spread Spectrum: Disabled

Advance CPU Settings......

CPU Ratio Setting: 21
C1E Suppport: Disabled
Hardware Prefetcher: Disabled
Adjacent Cache Line Prefetch: Disabled
Intel® Virtualization Tech: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
Intel (R) HT Techology: Enabled
Active Processor Cores: All
A20M: Disabled
Intel (R) SpeedStep (TM) Tech: Disabled
Intel (R) Turbo Mode Tech: Disabled
Intel (R) C-STATE Tech: Disabled

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How do I know if it is done automaticly, I don't see anything in CPUZ that says IOH anything... what program do I need to find out what my board is doing with auto? I am soooo dang close to 4.5 is it rediculous!!!!!

In my sig rig to get 4.5 (bclk 215) i used:

CPU Voltage: 1.475 (1.488 @ load)
Qpi voltage: 1.40625
IOH voltage: 1.20
Ram: forced @ 1723 and 8-8-8-24
BCLK: 215
Multiplier: 21
Bios: Crossflashed 0006 P6T bios on p6t deluxe v2

everything else auto, no skew

Your IOH is on auto, and as far as i know there isnt a way to really tell what voltage the northbridge is getting within the OS for an Asus board. Someone correct me if this is wrong. Just set it manually to 1.3 and work your way up from there to 1.4-1.5 if you want to try those voltages. I didnt need them for 4.5, but i did need ALOT more vcore and a fairly large vtt (qpi). These two voltages will likely be untenable on air, but give them a try

For comparison, to get 4.4 stable (70 passes linX max memory ) I used

vcore: 1.38125
vtt (qpi):1.325
ioh: 1.2

everything else auto, ram at 1680ish