Overclocking Intel's Core i7 920

Using your bios settings I cannot get my pc to boot at 4ghz.
Any ideas why it might not be booting... I triple checked all your settings even compared to what you had posted on the screen shots in the bios on my other pc to the current. Thanks for the help.

CPU SPECS:
Intel 920 I7 under a Vigor Monsoon 3 LT Dual 120mm Heatsink
Asus Rampage 2
Radeon HD 4870
Corsair Dominator 3x1GB DDR3 1600

So I got the same setup as in the guide, the i7 920- P6T deluxe- Noctua NH-U12P- CORSAIR DOMINATOR 6GB DDR3 1600.

Original
http://img339.imageshack.us/img339/880/originalnw4.bmp

OC
http://imageshack.us
http://g.imageshack.us/img240/overclockedfl5.png/1/

Numbers:
CPU Ratio: 20
BCLK: 190
PCIE: 100
DRAM Freq: DDR3 - 1523 MHz
DRAM Bus: 1.66
CPU Voltage: 1.35
CPU PLL Voltage: 1.96
QPI/DRAM Core Voltage: 1.35
CPU Differential Amplitude: 800MV

When I run Prime95 it goes to blue screen after a few mins. Not sure what to do.

Memory timings? or speed?

Try dropping the memory down one notch to see if that compensates. What speed is your Uncore running? Try dropping that down too.

Its this ram, looks like timing is 8-8-8-24

I dropped the BCLK down to 180 and running prime95 without a crash so far, just not sure if I should do anything else.

I used that exact same memory, in that exact same board (in fact, I'm testing it now for review).

What BIOS are you using?

Version 1003 12/05/08....so far so good, at least in terms of not BSOD

Im on 0903 still.

Ey guys

I have the same problem too ive got the same setup basically and it crashes right away at
4Ghz, anything i have missed?

**edit bios version 703**
Core i7 920
ASUS P6T deluxe
Corsair Dominator 8-8-8-24, 1600Mhz, (Manufac Code: TR3X6G16000C8D)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145224
Noctua NH-U12P


also but i doubt it would effect it
SLI gtx280's

Same settings as the guide however when i get into vista and start prime95 it fails right away(1-3mins)

Any ideas what i should lower im assuming the BCLK frequency, but i hope ive just missed a setting in the bios

Ill get some bios pictures up asap to help with any recommendations
(changing settings now to take them lolz)

Cheers Trent

*******EDIT*******(for images)
Now i noticed this time Ai Tweaker differed i had a few extra options... differnt bios versions (Im on version 703 what was the article done with???) or did i miss something.
ill check the bios version in a minute to see if they match, ive boxed the items that differ

Here is mine
http://i515.photobucket.com/albums/t354/trent_rulz/one.jpg


Here is from the article
http://i515.photobucket.com/albums/t354/trent_rulz/ab2-8.jpg

Rest are mine

http://i515.photobucket.com/albums/t354/trent_rulz/two.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/three.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/four.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/five.jpg

Any ideas as to what to change or just lower BCLK frequency??? so it wont crash right away in prime 95

Cheers Trent
(if images of other sections of the bios are needed yell ill get onto it asap if they help)

Originally Posted by Bindibadgi
Im on 0903 still.

Was 903 what the article was done on?, that may be why i differ im on version 0703.

Would a different version be the cause of why its unstable???? silly question but im not the best at this, if so would it be worth going to 903 or the latest what which one would be recommended?

Cheers Trent

**edit**
article used version 0804 bios version :)

Enable APCI 2.0 support.

Up the CPU differential amplitude to 900, Disable C-State tech, lower the QPI frequency as much as possible and set the UClk to ~2660 if possible.

Updating the BIOS usually makes a difference - check the changelog on the Asus website.

ok lets see how i go repost soon lolz

ty for the speed i must add

Cheers Trent

ekkkkk :S

No go, didnt get past the windows vista loading screen, always a blue screen tried it a few times too

Loading up bios pics soon just first going to compare that i did have the same previous settings and changed what asked

btw the lowest UCLK was 3208Mhz (double ram speed the description said)
and lowest QPi was 7208Mhz

Cheers Trent

***edit bios version 703 images*** (After alteration)

Originally Posted by Bindibadgi
Enable APCI 2.0 support.

Up the CPU differential amplitude to 900, Disable C-State tech, lower the QPI frequency as much as possible and set the UClk to ~2660 if possible.

Updating the BIOS usually makes a difference - check the changelog on the Asus website.

http://i515.photobucket.com/albums/t354/trent_rulz/a11.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/a12.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/a13.jpg
http://i515.photobucket.com/albums/t354/trent_rulz/a14.jpg


Im running 703 bios now the new versions

803
P6T Deluxe 0804 Bios
1. Improvie Memory compatibility

2. Revised QPI/DRAM Core Voltage setting in CPU Level Up

3. Support new CPUs. Please refer to our website at: http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us"


1003
P6T Deluxe 1003 Bios
1. Fix Incorrect selectable range of "QPI/DRAM Core Volt" in TurboV
2. Fix Express Gate would disappear if ever shutdown abnormally in ExpressGate
3. Improve compatibility with some USB Keyboard
4. Improve Memory compatibility

i doubt its any of those form what ive been reading...? could they be?

It doesn't look like your CPU can't do it then - I suspect your UClk can't do 3.2GHz :(

You can try and play with the clock skews, but it's an entirely blind art, or check other forums (xtremesystems?) for overclocking tips and other people's experiences.

dang, ummm

ill have a peak around some other forums silly question really if i stick with the last lot of suggestions (last post)

would lowered the base clock make the system stable??
or would lowering the ram speed to 1333?? thus it should run at 2606???? help in any way???

:S

Cheers Trent

btw im open for ideas ill try anything as long as its not totally stupid like Vcore 3.4V lol

http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3502

You might want to check this out. It seems some 920s just don't do over 3.8GHz.

Thanks for the links

ive been reading quite abit and its been interesting. You are right some cant acheive a 4gHz clock without overvolting the cpu Vcore ~ 1.37-1.42 on average. From reading ive found that OC with a CPU ratio setting of **20**. Apparently its a pain in the bum to make systems stable at 4gHz with a lower Vcore.

Some are lucky and depending on the batch can acheive a stable 4gHz clock with low Vcore's (1.25!!!). Due to the manufacturing process there is a suprissing varience in Vcore drop... (i think that was what it is, ill double check and post a link)

Alot of people are recommending a CPU ratio of **19** and up the BCLK frequency ~210

Also people are saying some 920's say are stable at 1.30Vcore 4Ghz but up the Vcore to 1.35(like in my case) and it becomes unstable

So time to have abit of a play


1 question though which i cant seem to find a post for is

when overclocking we up the BCLK
now at a point its becomes unstable and we must up the Vcore to compensate for the BCLK

Now when do we up the CPU PLL voltage???????

I understand the memory side alright same basic idea, but CPU PLL voltage im unsure if any1 can answer this thanks heeps, or even better explain what it is as well

Cheers Trent

Increase PLL voltage in relation to CPU voltage. I usually stick it at 1.94-98 when overclocking.

Is there a difference in idle or Prime95 wall-power between an i7-965 and an i7-920 that has been overclocked up to the 3.2ghz rate of the i7-965, and are there any real advantages for the i7-965 in any of the benchmarks reported, for this level of overclocking? I am not sure I want to spend an extra 165 watts 24/7 for years to come, just to be able to claim 4ghz.

The 965 is unlocked so you can vary the multiplier for the CPU and memory, without adjusting the base clock value.

The 920 will easily overclock to 3.2GHz but some will need some extra voltage.

Sorry, I was not clear in my posting. My intent was to request that the author actually measure the power consumption of a 920 overclocked to 3.2 ghz vs a native 965, and run the benchmarks again for just that 920 and a native 965. Is there any reason to buy a 965 ? The capital outlay ratio is 3.5 to one. If I have more than one node running at 165 watts extra, that is 118 kwh each per month. If oclock to 3.2 is significantly less expensive than oclock to 4.0, that would be much better.

The only real reason to buy a 965 is that it's unlocked: it's for extreme OC-ers. The $700 saving for a 920 will see your electricity bill for a while, even if it consumes more power.

I'm afraid I don't have time to reinstall the system and run those benchmarks again, sorry. :)

silly question but would a system that can run prime 95 for 4hours before a BSOD be pritty stable???

Ive got mine at 3.8gHz thanks to some help, and i ran prime 95 twice first time lasted 4 hours and 2nd time 4.5hours.

Would that be stable for nearly everything????

Cheers Trent

Maybe, while prime loads the cpu more than most other applications and several hours prime stable is indeed 24/7 stable with normal apps, there is still the gpu, prime doesnt load it at all, so you have not actually tested the system at the max possible heat load as a gpu at full load dumps a considerable amount of head inside the case, even if it has a exhaust fan. Also you have not tested if the psu can keep it up.

To create a worst case scenario for stability testing I'd recommend running prime 95 and furmark at the same time.

Yes good point

I am going to but currently in melbourne for the next 4 days straight its 40C and higher!!!!, it was 36C today.

Because of this my computer is sitting 10C above normal and will run the lot together once it cools down. Im upstairs around the corner so no air con hits my room lol


Power supply wise i should be ok but shall double check

Its a 1000W corsair
core i7 920 @ 3.8
SLI gtx 280's @ stock

Should be approx 2/3-3/4 the power supply load with everything at 100% load
Supid question what apps normally run both at 100% load, games?? or CAD software?? (They shouldnt)


Cheers Trent

(ill try the 1.29Vcore tomorrow morning or late tonight when the temps are abit lower)