i7 920 D0 Can't find steady low vcore at 4ghz

[Steagan]

Hello. I've been trying to OC my cpu to 4ghz and it seems impossible. I've spent countless hrs tweaking settings and trying to get it stable without going out 1.4v on the vcore (which I'd like to be my max vcore). I've only gotten it stable at 3.8ghz at 1.4vcore. I'd like to achieve 4.0ghz if if not that atleast 3.9ghz. What suggestions do you guys have to make this work? Thank you!

Specs and pics follow below:

CPU: i7 920 D0 (Stepping 5, Batch #3923a87)
Air cooling: CNPS10X Extreme Cooler (Artic Silver 5)
MOBO: EVGA x58 SLI LE
PSU: HX 1000w
Ram: 12GB Corsair Dominator. (6x2GB (PC3-12800) DDR3 1600 @ 1450 Mhz ) (8-8-8-24 Timing)
GPU: Galaxy GTX 580 1GB
OS: Windows 7 64-bit






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[redduc900]

Give these settings a try for 4.0GHz (Turbo disabled, VDroop Control = Without VDroop, Vcore at 1.325V, and DRAM frequency at DDR3-1600; HT and EIST enabled)...

Frequency Control 
CPU Clock Ratio ( 20X )                                                                                         
CPU Host Frequency (Mhz) ( 200 )                                                                   
MCH Strap ( Auto ) 
CPU Uncore Frequency (Mhz) (17X)                                                
CPU Clock Skew ( 0 ps ) 
Spread Spectrum ( Disabled ) 
PCIE Frequency (Mhz) ( 100 ) 

Memory Feature        
Memory Speed ( Standard ) 
Memory Control Setting ( Enabled ) 
Memory Frequency ( 2:8 )                                                                
Channel Interleave Setting ( 6 Way ) 
Rank Interleave Setting ( 4 Way ) 
Memory Low Gap ( Auto ) 
tCL Setting ( 8 ) 
tRCD Setting ( 8 ) 
tRP Setting ( 8 ) 
tRAS Setting ( 24 ) 
tRFC Setting ( 74 ) 
Command Rate ( 2t ) 

Voltage Control 
EVGA VDroop Control ( without VDroop ) 
CPU VCore ( 1.325 )                                                                                            
CPU VTT Voltage ( +200 ) 
CPU PLL VCore ( 1.9 ) 
DIMM Voltage ( 1.65 ) 
DIMM DQ Vref ( +0mV ) 
QPI PLL VCore (1.325) 
IOH VCore (1.375) 
IOH/ICH I/O Voltage (1.625) 
ICH VCore ( 1.25 ) 

CPU Feature 
Intel SpeedStep ( Enabled ) 
Turbo Mode Function ( Disabled) 
CxE Function ( Disabled ) 
Execute Disable Bit ( Enabled ) 
Virtualization Technology ( Enabled ) 
Intel HT Technology ( Enabled ) 
Active Processor Cores ( All ) 
QPI Control Settings ( Enabled ) 
QPI Link Fast Mode ( Enabled ) 
QPI Frequency Selection ( 4.800 GT/s )

... you may need to adjust VTT for added stability w/ 12GB of RAM installed, and may also get by w/ less PLL voltage and Vcore.