The i7 920 on P6T overclocking guide thread

[speckled10]

You guys who are hitting 4GHz stable, what is your DRAM frequency and UCLK at?

20x200 Manual
1603Mhz & 3208Mhz
CPU @ 1.4000V
LLC Enabled
8-8-8-24 (match my ram)
C-State Enabled/Auto

rest is default

[speckled10]

Arlight .. success with the cooler refit .. change to horizontal mount (fans blowing up out top of case) & redid paste and my temps are down 15C .. Idle's also down to sub-30C for first time ..

4Ghz 1600Mhz Prime 8K HT On


4Ghz 1600Mhz Prime 1024K HT On


4Ghz 1600Mhz Cinebench HT On


4Ghz 1600Mhz Prime HT Off


Memory is still at 1600Mhz 8-8-8-24-1T also ..

Bloody happy with that .. finally !

[kompulsive]

What are "LLC" and "C-State"? I'm assuming they are settings, but I must not be seeing where they are. (Yes, I realize they're probably right in front of my face.)

[speckled10]

What are "LLC" and "C-State"? I'm assuming they are settings, but I must not be seeing where they are. (Yes, I realize they're probably right in front of my face.)

Check your PM ..

LLC = Load Line Calibration = Enabled (AI Tweaker Menu in BIOS)
C-State = Enabled/Auto (Advanced -> CPU Config Menu in BIOS)

The latter one prob doesnt help with OC .. but gives extra power savings at Idle in addition to C1E (which defaults on) .. especially while having Speedstep/Turbo off (which I found only made temps worse anyway) ..

[FZ1]

What's the highest OC anyone has gotten on stock volts on the i920? Waiting for my case but I'm thinking I'm gonna try for a 3.4Ghz - 3.6Ghz OC for day to day use. I'm guessing a little over 3 is possible without increasing the voltage but that's just a guess.

[ownage]

A friend of mine bought a 920 with P6T and we did some testing yesterday. Overclocking was easy. All bios settings on auto, low memory devider, only raising Bclock, and we where able to boot at 4.3ghz into windows. 4.4Ghz POSTed, but windows froze at loginscreen. Stock cpu cooling btw

[speckled10]

A friend of mine bought a 920 with P6T and we did some testing yesterday. Overclocking was easy. All bios settings on auto, low memory devider, only raising Bclock, and we where able to boot at 4.3ghz into windows. 4.4Ghz POSTed, but windows froze at loginscreen. Stock cpu cooling btw

How cold is it in the Netherlands atm ??? lol

Try prime see how long it lasts at 4.3Ghz ..

[ownage]

How cold is it in the Netherlands atm ??? lol

Try prime see how long it lasts at 4.3Ghz ..

We didn't bench because of the cooling. We had normal roomtemp. cpu was idling between 60-65c. We had lots of fun playing cpu-z

I haven't really focussed on I7 yet, so what do you guys say.
Good cpu (so far) or not?

[speckled10]

What's the highest OC anyone has gotten on stock volts on the i920? Waiting for my case but I'm thinking I'm gonna try for a 3.4Ghz - 3.6Ghz OC for day to day use. I'm guessing a little over 3 is possible without increasing the voltage but that's just a guess.

You should be able to hit 3.2Ghz with ease on stock volts .. just change BCLK leave rest on Auto .. it also gives nice memory timings at 1200Mhz or 1600Mhz depending what your running ..

For 3.2Ghz I actually *lower* CPU Volts to 1.2V as Auto has it running around 1.24V .. 3.6Ghz I give it about 1.3V .. rest on Auto ..

It's only 3.8Ghz - 4Ghz things start getting messy in the BIOS

[speckled10]

We didn't bench because of the cooling. We had normal roomtemp. cpu was idling between 60-65c. We had lots of fun playing cpu-z

Ouch !!

Still thats a bloody good chip you must have to get a 4.3Ghz bootup on stock cooler so easily ..

[003]

A friend of mine bought a 920 with P6T and we did some testing yesterday. Overclocking was easy. All bios settings on auto, low memory devider, only raising Bclock, and we where able to boot at 4.3ghz into windows. 4.4Ghz POSTed, but windows froze at loginscreen. Stock cpu cooling btw

If you had C1E enabled, then the CPU would only be running at 8x multiplier when there was no or very little load.

[Hot'n'Chilly]

Arlight .. success with the cooler refit .. change to horizontal mount (fans blowing up out top of case) & redid paste and my temps are down 15C .. Idle's also down to sub-30C for first time ..

4Ghz 1600Mhz Prime 8K HT On


4Ghz 1600Mhz Prime 1024K HT On


4Ghz 1600Mhz Cinebench HT On


4Ghz 1600Mhz Prime HT Off


Memory is still at 1600Mhz 8-8-8-24-1T also ..

Bloody happy with that .. finally !

ooh ooh, whats your settings? Could you list exactly what youre using, or maybe post a screen?

[speckled10]

ooh ooh, whats your settings? Could you list exactly what youre using, or maybe post a screen?

For those screenshots I used:

Multi: 200x20
SpeedStep/Turbo = OFF
CPU Volts = 1.4V
DRAM = 1600Mhz 8-8-8-24
Uncore = 3208Mhz
QPI = 7218MT/s
LLC = Enabled
C-State = On/Auto
Rest = Auto/Default

But it turns out I was only prime stable enough for those snaps .. at 20min mark prime would go down..

Adding the following changes got me about 85 mins of prime:

200x20
DRAM 1603Mhz
CPU 1.4V
DRAM 1.68V
QPU 1.35625V
SpeedStep/Turbo Off
LLC Enabled
CPU/PCI Spread Spectrum Disabled
C-State Enabled
ACPI 2.0 Enabled
Rest = Auto/Default

I think the lower QPI+DRAM voltages were the key .. Auto had DRAM 1.8V & QPI 1.3725V and bumping them higher immediately made things much worse (10 sec crash) ..

dejanh noticed this earlier .. I think the i7's must be sensitive to temperatures generated in the memory & NB paths - caused by QPI & DRAM volts .. which the core DTS's temp sensors cant really pick up - and only water is capabable of controlling ..

[ownage]

If you had C1E enabled, then the CPU would only be running at 8x multiplier when there was no or very little load.

We disabled a few cpu functions like C1E off course.
The board couldn't go over 211 Bclock (n. I'm sure this chip would have successfully booted at 4.4 or 4.5ghz if Bclock wasn't a problem.

[randyguthrie]

I have an Asus Rampage II Extreme which I would assume must be very similar to the P6T. With the stock fan I can get my i920 to a Bclock of 160MHz. I raised the CPU voltage to 1.4V but this did not really help.

I have a Mach II GT cooler which cools the CPU down to -50C. Under a 200W load it goes up to about -10C. The thing is that colling the CPU did not change the Bclock performance. I was still only able to get a Bclock of 160MHz at -50C. Once I had the CPU at -50C I also raised all of the CPU voltages to their maximum safe settings (core voltage at 1.5V) but this did not help.

I am assuming that it is not the CPU that is holding me back. I reduced the memory speed so as not to exceed the rated speed of my memory so that is not the issue. Can anyone give me any pointers?

[tjelaw]

Ordered my i7 920 today together with a P6T & 6GB OCZ kit. Cant wait to have a go with it.

Will be cooling it in a single loop EK Supreme with TFC480 rad. Maybe we can get the topic starter to keep updating the first post? With general guidelines what works/help improve OC. So we can keep track of all the best settings etc. Its so much more efficient then searching through all the pages an reply's that are sure to follow.

[speckled10]

I have an Asus Rampage II Extreme which I would assume must be very similar to the P6T. With the stock fan I can get my i920 to a Bclock of 160MHz. I raised the CPU voltage to 1.4V but this did not really help.

I have a Mach II GT cooler which cools the CPU down to -50C. Under a 200W load it goes up to about -10C. The thing is that colling the CPU did not change the Bclock performance. I was still only able to get a Bclock of 160MHz at -50C. Once I had the CPU at -50C I also raised all of the CPU voltages to their maximum safe settings (core voltage at 1.5V) but this did not help.

I am assuming that it is not the CPU that is holding me back. I reduced the memory speed so as not to exceed the rated speed of my memory so that is not the issue. Can anyone give me any pointers?

So are you not able to reach 200 BCLCK ? Did you try my settings above those should at least get you into Windows ..

I found clocking memory anything over its rated Mhz is not good for stability ..

[duldog]

Heres my settings
Asus P6T Deluxe
Core i7 920
Corsair TR3X3G1600C8D 8-8-8-24 1.65V

CPU Configuration
C1E : disable
Hardware Prefetcher : disable
Adjacenct Cache : disable
Intel VT : disable
CPU TM : disable
Exceute Disable Bit : disable
Intel HT : Enable
Active Processore Cores : Enable
A20M :disable
Intel Speed Step : Enable
Intel Turbo Mode: Enable
Intel C-STATE :disable

=======================

Ai Overclock Tuner
I set with : Ai Overclock Tuner / X.M.P. Mode
Memory profile 1600Mhz 8-8-8-24

==================

CPU Ratio Setting : Auto for turbo mode on mutiple @ 20 to 21
BCLK : 200Mhz
PCIE : 100Mhz
DRAM : 1600Mhz

====================

Vcore : 1.40V @ 4.2Ghz (Turbo Mode )
CPU Pll : auto
QPI/DRAM : auto
IOH : auto
IOH PCIE : auto
ICH :auto
ICH PCIE : auto
DRAM Bus : 1.64V
and auto.......

Load-Line Calibration : Enable
CPU Clock Skew : auto
CPU Spread Spectum : Disable
IOH Clock Skew : auto
PCIE Spread Spectum : Disable


Can run 4.3Ghz @ 205 Blck 1.45V cpu 1.66ram
my problem is that I can't go any higher wth the block frequency..
Any ideas???
http://valid.canardpc.com/show_oc.php?id=469563

[speckled10]

Heres my settings
Asus P6T Deluxe
Core i7 920
Corsair TR3X3G1600C8D 8-8-8-24 1.65V

CPU Configuration
C1E : disable
Hardware Prefetcher : disable
Adjacenct Cache : disable
Intel VT : disable
CPU TM : disable
Exceute Disable Bit : disable
Intel HT : Enable
Active Processore Cores : Enable
A20M :disable
Intel Speed Step : Enable
Intel Turbo Mode: Enable
Intel C-STATE :disable

=======================

Ai Overclock Tuner
I set with : Ai Overclock Tuner / X.M.P. Mode
Memory profile 1600Mhz 8-8-8-24

==================

CPU Ratio Setting : Auto for turbo mode on mutiple @ 20 to 21
BCLK : 200Mhz
PCIE : 100Mhz
DRAM : 1600Mhz

====================

Vcore : 1.40V @ 4.2Ghz (Turbo Mode )
CPU Pll : auto
QPI/DRAM : auto
IOH : auto
IOH PCIE : auto
ICH :auto
ICH PCIE : auto
DRAM Bus : 1.64V
and auto.......

Load-Line Calibration : Enable
CPU Clock Skew : auto
CPU Spread Spectum : Disable
IOH Clock Skew : auto
PCIE Spread Spectum : Disable


Can run 4.3Ghz @ 205 Blck 1.45V cpu 1.66ram
my problem is that I can't go any higher wth the block frequency..
Any ideas???
http://valid.canardpc.com/show_oc.php?id=469563

Mate your already doing extremely well getting to 4.2Ghz with Turbo on that setup .. I've found my P6T doesnt like anything above 200 BCLK .. heck it even hates Speedstep & Turbo as well ..

Run any stress tests with that setup ? Is it stable ? Temps ?

[duldog]

@ 4.2Ghz Idle temps hovers around 45 full load around 76ish with thermalright ultra 120 push-pull fans
@ 4.3ghz it idles around 51 @ 1.45v
tested both speeds with prime 18hours straight with no issues
@207blck will boot but freezes on windows loadup
http://valid.canardpc.com/show_oc.php?id=470085

[speckled10]

@ 4.2Ghz Idle temps hovers around 45 full load around 76ish with thermalright ultra 120 push-pull fans
@ 4.3ghz it idles around 51 @ 1.45v
tested both speeds with prime 18hours straight with no issues
@207blck will boot but freezes on windows loadup
http://valid.canardpc.com/show_oc.php?id=470085

Makes sense ... thoe are high Idles but great load temps .. great CPU & MB you have there !

If you wanna bring Idle's down .. turn C-State & C1E back on .. shouldn't affect your stability either ..

Can I ask which thermal grease your using with the TRUE 120 ?

[tjelaw]

Got my setup today. 920 + P6T

4ghz was EZ-mode. 4,2 is causing more problems. I can bench and stress fine @ 200x21 with HT enabled, but it automatically throttles my multi back to 20.5 when the CPU gets under load. Its definately not the temps, its pretty cold over here. Everest shows slighly higher temps than Realtemp but still under 70 full load....

[Hot'n'Chilly]

Heres my very first i7 920 OC on my P6T (using OCZ DDR3 1333). So what do you think? Am I doing anything wrong??? Do my voltages make sense? I was more or less blind guessing.

CPU Ratio: 17
BCLK: 195
DRAM: 1563mhz
UCLK (UnCore): 3322mhz
QPI: 7038 MTs

CPU Voltage: 1.2375v
PLL Voltage: 1.9c
QPI (unCore) Voltage: 1.4v
DRAM Voltage: 1.62v

[speckled10]

Got my setup today. 920 + P6T

4ghz was EZ-mode. 4,2 is causing more problems. I can bench and stress fine @ 200x21 with HT enabled, but it automatically throttles my multi back to 20.5 when the CPU gets under load. Its definately not the temps, its pretty cold over here. Everest shows slighly higher temps than Realtemp but still under 70 full load....

Go checkout this thread ..

http://www.xtremesystems.org/forums/...d.php?t=212389

Not everyone seems to have the problem tho ..

[vikingboy]

crazy newbie here......im just setting up my 920 with my p6t and was bothered about core 0+1 being about 5 deg higher than cores 2+3....so in a moment of madness I took the sandpaper to the core and low and behold.....temps have dropped by about 10degrees overall but difference still exists between the two pairs. I guess this is engineered into the core and not possible to remove. Im using a lapped 120 extreme with a push fan running about 2000rpm and seeing full load temps of mid 70's with a CPUZ displayed core voltage of 1.504

Seems like a worthwhile mod

Ive also found the Load Line Calibration useful when overclocking my rig - it seems to compensate nicely for lag in the line and allows a higher overclock.

Will post my final settings when Ive finished fine tuning but so far, Im loving this processor and board :-) beats my old Q6600 easily!