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Overclocking I7 940 and P6T6 WS
- Thread starter ilogik
- Start date
Disclaimer: Overclock at your own risk. Know your own limits, and never cross into unknown territory. When in doubt, back off on the overclock, and if you don't know what you are doing, forget about it.
I assume that you have DDR3 1600 Mhz memory or better (1866 Mhz / 2000 Mhz). I assume that your memory is XMP compatible (and no big deal if it isn't).
I assume that you have water cooling, or at least ultra high end air cooling (TRUE and above).
If not, don't follow my advice below. You would have to aim for a less ambitious overclock. I say again, do not attempt what I say below unless you have proper cooling. If not, abort mission till you get proper cooling.
Here goes:
Set bios to XMP mode.
Multiplier: 22 or Auto (assuming a Core i7 940 2.93 Ghz cpu; I personally use a 920)
BCLK: 175 Mhz
HyperThreading: On
Turbo: On (that will bump the multiplier to 23x)
Ultimate CPU speed in Windows: 4025 Mhz
CPU speed in Bios: 3850 Mhz
CPU Voltage: 1.35 volts (if possible) or 1.375 volts. Don't go past 1.375 volts without water cooling.
DRAM speed: 1400 MHz (175x8)
DRAM timing: 8-8-8-24-1T (it should set in XMP mode, except for the 1T). You can try for CAS7-7-7-20-1T, but its a long shot.
DRAM voltage: 1.64 volts (you will find that 1.65 volts defaults to 1.66 volts). Keep in mind that Intel says 1.65 volts and above *will kill* the *cpu* *and* *the memory* but that hasn't been my experience, but I'm not smarter than Intel 🙂
Bottom line: 4.2 Ghz is possible with some perserverance. 4.0 Ghz is relatively easy. Load temps (except in Intel burn test) in the mid 50s on all cores with 8 threads. Idle temps will depend on your room ambient temp and really is inconsequential.
***Don't even think of going above 3.6 Ghz without proper cooling.***
***Don't even think of going above 3.33 Ghz while using the intel stock heatsink*** (or you will see load temps 80 degrees and up.
I assume that you have DDR3 1600 Mhz memory or better (1866 Mhz / 2000 Mhz). I assume that your memory is XMP compatible (and no big deal if it isn't).
I assume that you have water cooling, or at least ultra high end air cooling (TRUE and above).
If not, don't follow my advice below. You would have to aim for a less ambitious overclock. I say again, do not attempt what I say below unless you have proper cooling. If not, abort mission till you get proper cooling.
Here goes:
Set bios to XMP mode.
Multiplier: 22 or Auto (assuming a Core i7 940 2.93 Ghz cpu; I personally use a 920)
BCLK: 175 Mhz
HyperThreading: On
Turbo: On (that will bump the multiplier to 23x)
Ultimate CPU speed in Windows: 4025 Mhz
CPU speed in Bios: 3850 Mhz
CPU Voltage: 1.35 volts (if possible) or 1.375 volts. Don't go past 1.375 volts without water cooling.
DRAM speed: 1400 MHz (175x8)
DRAM timing: 8-8-8-24-1T (it should set in XMP mode, except for the 1T). You can try for CAS7-7-7-20-1T, but its a long shot.
DRAM voltage: 1.64 volts (you will find that 1.65 volts defaults to 1.66 volts). Keep in mind that Intel says 1.65 volts and above *will kill* the *cpu* *and* *the memory* but that hasn't been my experience, but I'm not smarter than Intel 🙂
Bottom line: 4.2 Ghz is possible with some perserverance. 4.0 Ghz is relatively easy. Load temps (except in Intel burn test) in the mid 50s on all cores with 8 threads. Idle temps will depend on your room ambient temp and really is inconsequential.
***Don't even think of going above 3.6 Ghz without proper cooling.***
***Don't even think of going above 3.33 Ghz while using the intel stock heatsink*** (or you will see load temps 80 degrees and up.
P6T6 WS Revolution Bios 0407
Of course Turbo is there.
SpeedStep must be left on. Leave Turbo on. Leave HyperThreading on.
Download CPU-Z. See for yourself the 21x multiplier within windows. It will be 20x multiplier within the bios and you will not see the increased speed outside of windows.
Here is a picture with a 21x multiplier. Without Turbo, 21x is absolutely impossible. This is at 100% stock speeds using "Auto" for everything. Note the very low cpu voltage, and that's the advantage of SpeedStep.
http://i305.photobucket.com/al...3/ianyeoh/Untitled.jpg
Of course Turbo is there.
SpeedStep must be left on. Leave Turbo on. Leave HyperThreading on.
Download CPU-Z. See for yourself the 21x multiplier within windows. It will be 20x multiplier within the bios and you will not see the increased speed outside of windows.
Here is a picture with a 21x multiplier. Without Turbo, 21x is absolutely impossible. This is at 100% stock speeds using "Auto" for everything. Note the very low cpu voltage, and that's the advantage of SpeedStep.
http://i305.photobucket.com/al...3/ianyeoh/Untitled.jpg
Vindaloo12
Junior Member
I want to thank the community for providing so much "free" help to overclock the i7 920.
After many hours of fiddling, I got my second build i7 920 to do 3.88ghz comfortably with core temps below 86c.
BUILD
OS: Vista64 Ultimate
Case:Antec300 with side 120mm fan and 1 front 120mm fan installed both spinning
below 1450.
CPU: Core i7 920 (rev:C0/C1 stepping:4)
Motherboard: Asus P6T
Cooler: Scythe Mugen 2
Mem: OCZ3G1600LV6K 6gb PC3-12800+ DDR3-1600 Triple Channel
PSU: PC Power & Cooling S75CF 750W
DVD: NEC ND-3520A
Drive: Seagate WD500gb SATA2 16mb
LCD: 24" Sceptre
BIOS SETTINGS
Bclk: 185
CPU Ratio: Left at auto so 21x can kick-in
Stepping and Turbo: Enabled
CPU Volt: 1.325v
CPU PLL: Auto (1.80v)
QPI Volt: 1.35v
Dram Bus Volt: 1.66 (timing set to 8/8/8/24/1T)
STATS
Prime95 ran 8hrs with no errors. Realtemp core temp max at 86c.
I hope this will help set a base reference for those trying to overclock with Asus P6T.
Best,
Vindaloo
After many hours of fiddling, I got my second build i7 920 to do 3.88ghz comfortably with core temps below 86c.
BUILD
OS: Vista64 Ultimate
Case:Antec300 with side 120mm fan and 1 front 120mm fan installed both spinning
below 1450.
CPU: Core i7 920 (rev:C0/C1 stepping:4)
Motherboard: Asus P6T
Cooler: Scythe Mugen 2
Mem: OCZ3G1600LV6K 6gb PC3-12800+ DDR3-1600 Triple Channel
PSU: PC Power & Cooling S75CF 750W
DVD: NEC ND-3520A
Drive: Seagate WD500gb SATA2 16mb
LCD: 24" Sceptre
BIOS SETTINGS
Bclk: 185
CPU Ratio: Left at auto so 21x can kick-in
Stepping and Turbo: Enabled
CPU Volt: 1.325v
CPU PLL: Auto (1.80v)
QPI Volt: 1.35v
Dram Bus Volt: 1.66 (timing set to 8/8/8/24/1T)
STATS
Prime95 ran 8hrs with no errors. Realtemp core temp max at 86c.
I hope this will help set a base reference for those trying to overclock with Asus P6T.
Best,
Vindaloo
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