Here are my settings for a stable overclock to 4.0GHz.
Code:CPU & Batch (i7 920 D0 – 3903A485) RAM Model (2x3GB Mushkin Redlines) Bios Ver: Quantum BIOS (P07) CPU Features PPM : Enabled EIST : Enabled CxE : Disable Execute Disable Bit : Disabled Virtualization : Disabled Hyper Threading : Enabled Active Processor Cores : All Current Feedback Override : Disabled Memory Settings Memory Controller Settings IMC Configuration : Enabled Channel Configuration : Independent Channel Interleaving : 6 way Rank Interleaving : 4 way Memory Timings Extreme Memory Profile XMP : Disabled Memory Profile Select : Auto DRAM Timing Control : Manual tCL (CAS Latency) : 8T tRCG (RAS to CAS Delay) : 8T tRP (RAS Precharge) : 8T tRAS (Precharge Delay) : 24T CR (Command Rate) : 1T tRFC (Refresh Cycle Time) : Auto tWR (Write Recovery Time) : Auto tWTR (Write to Read Delay) : Auto tRRD (RAS to RAS Delay) : Auto tRTP (Read to Precharge) : Auto All Voltage Settings CPU Voltages CPU Core Voltage : +20mV CPU Target Core Voltage : 1.29500 CPU Vdroop Compensation : Disabled CPU VTT (UnCore) Voltage : +40mV 1.8 PPL Voltage Setting : 1.800V CPU Clock Amplitude Ctrl : 0.800V Memory Voltages DRAM Voltage : 1.65V DIMM1 Vref CA (Addresses) : x 0.500 DIMM1 Vref DQ (Data) : x 0.500 DIMM2 Vref CA (Addresses) : x 0.500 DIMM2 Vref DQ (Data) : x 0.500 DIMM3 Vref CA (Addresses) : x 0.500 DIMM3 Vref DQ (Data) : x 0.500 Chipset Voltages X58 IOH Core Voltage : 1.12V X58 IOH VCCA 1.1V : 1.108V X58 IOH VCCA 1.5V : 1.506V ICH10 SB Voltage : 1.506V CPU Turbo : Always On System Turbo : Enabled Clock Speed Control Center CPU Bclock (FSB) : 191MHz QPI Link Fast Mode : Enabled QPI Multiplier : x18 QPI Target Speed : 3443MHz (6.9GT/s) CPU Core Multiplier : x19 CPU Core Target Speed : 3635MHz CPU Uncore Multiplier : x16 CPU Uncore Target Speed : 3064MHz Memory Bus Multiplier : x8 Memory Bus Target Speed : 1532MHz (DDR3 1532) CPU Clock Skew : 0ps IOH Clock Skew : 0ps
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