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***The Official Core i7 Overclocking Thread***

twitch said:
If your overclock is what you want and stable with what you use your PC for..
Click to expand...

Stable is an absolute, not a scale. Unstable means it gets calculations wrong. Stable means it doesn't. Very unstable means it gets nearly everything wrong.

If your overclock is what you want and you don't bother stressing it properly, you have corrupted data and crashes in your future. Serve you right too, you've been warned.
 
Jokester said:
One of your cores has errored out there.
Click to expand...

Ooops. I turned HT off and it stays at 70 degrees at 4.2 Ghz.

I can get it to 4 Ghz with HT on and it goes up to 78 degrees. I wont be doing 4.2 with HT anymore.

I might be getting a gulftown anyway if they release one at £300 or less, but thats wishful thinking.

Heres my result with HT disabled:



I'll keep it like this now. Is HT really supposed to create so much more heat and instability as in my previous screenshot?
 
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twitch said:
Why should prime run for days ?

Do you leave your computer running 24/7 with all cores maxed normally ?

If your overclock is what you want and stable with what you use your PC for..
Why waste the electricity..

:confused:
Click to expand...

I use C1 / C3 / C5 states enabled in the bios. The CPU underclocks itself while it is idle or not being used much.

Then when you load a game or a benchmark, it goes up to full power.

Heres 4.0 Ghz with HT, and 7-7-7-20 ram:



Thats what I wanted all along, I just had to raise the channel ref volts on the ram a little. It does 1600 Mhz @ 7-7-7-20, or 1800 Mhz @ 8-8-8-24 (Geil Ultra Series CAS 9 2133 Mhz sticks).
 
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Here is my weekend result - 3.8GHz.

vCore: 1.26
QPI/VTT: 1.35
vDimm: 1.65
IOH/ICH: 1.1

RAM: Corsair XMS3 @ 1520 MHz 9-9-9-23-2T

LLC, HTT and virtualization were left on.

http://img8.imageshack.us/i/oc2.png/

For my core i7, a workable 4.0 GHz voltage seems to be somewhere in the 1.35-1.38 range. Anything less would crash Linpack64 outright in IBT and Prime95 would not even start.

Unfortunately, temperatures creep up above the 80C margin under present cooling conditions when I get it to behave, which for me is a no go come summer. I will try again to get 4.0GHz when that's addressed and I have less finicky RAM - chief culprit of my problems overall.

I will fiddle with this more next weekend. With luck, I will not be as ill as I am right now. :)
 
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Heres with my Arctic MX3, an extra 12 CM fan over my graphics cards, and more powerful intake fans:



That made quite a difference. It went on for an hour allongside two 32m Super PI runs so it seems completely stable, but any lower voltage causes BSODs.
 
easyrider said:
FFS

Should be able to then....

From this you are living in the realms of a deluded overclock.

I beat myself up getting my 24hr prime shot. Not for anyone else other than me.

I'm going to suggest your 4ghz clock is not true unless you show a screenie of a 24hr prime stablity shot at Blend.

Cheers
Click to expand...

FFFS

lol
In my deluded world my 4ghz clock is just fine.

It will run @ 4.4 though volts have to go above 1.3275 (core and vtt) in bios any thing below will fail after about 5 hours of the "Prime"

I will how ever run it for 24 hrs this weekend just for you at 4ghz ;)
 
easyrider said:
Cool
Click to expand...

Just over 12 hrs and still going :eek:

Bloody mrs is moaning now about the pc being left on :rolleyes:

See you in 12 hours ... hopefully ;)

prime12.png
 
Good to see you are going for 24 hours. As the others have said, if a system is not entirely stable then there is potential for a miscalculation at any time - it doesn't have to be stressed to error. A combination of burntest and 24 hr Prime is a good way of ensuring this will not happen :)

And some of us do run the systems round the clock at high loads as workstations. Total stability is even more important in these cases.
 
Well came home from work and...

FAIL :D

It was at a login screen not a bsod ??

It ran till..
[Fri Mar 12 12:11:20 2010]
Self-test 1792K passed!
Self-test 1792K passed!
Self-test 1792K passed!
[Fri Mar 12 12:16:55 2010]
Self-test 1792K passed!
Self-test 1792K passed!
Self-test 1792K passed!
Self-test 1792K passed!
Self-test 1792K passed!
[Fri Mar 12 12:27:22 2010]
Self-test 2048K passed!
Self-test 2048K passed!
Self-test 2048K passed!
Self-test 2048K passed!
Self-test 2048K passed!
[Fri Mar 12 12:38:11 2010]
Self-test 2048K passed!
Self-test 2048K passed!
Self-test 2048K passed!
[Fri Mar 12 12:43:27 2010]

Checked in admin events and nothing untill like 15 mins after it seemed to have stopped, that was..

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="VSS" />
<EventID Qualifiers="0">8194</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2010-03-12T13:03:11.000000000Z" />
<EventRecordID>4444</EventRecordID>
<Channel>Application</Channel>
<Computer>twitch-PC</Computer>
<Security />
</System>
- <EventData>
<Data>0x80070005, Access is denied.</Data>
<Data>Operation: Gathering Writer Data Context: Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220} Writer Name: System Writer Writer Instance ID: {8a8e4e8e-188e-4900-a8c3-fc3ec5e56908}</Data>
<Binary>2D20436F64653A20575254575254494330303030313235312D2043616C6C3A20575254575254494330303030313230352D205049443A202030303030313434342D205449443A202030303030323634302D20434D443A2020433A5C57696E646F77735C73797374656D33325C737663686F73742E657865202D6B204E6574776F726B53657276696365202020202020202D20557365723A204E616D653A204E5420415554484F524954595C4E4554574F524B20534552564943452C205349443A532D312D352D3230</Binary>
</EventData>
</Event>

So the wife reckons she didn't touch it... :rolleyes:
The long and the short of it is it ran for just over 18 hrs..

Thats more than enough for me, so If that means I am deluded then so be it..

I ain't running it again for that time again.

I have some more fans coming tomorrow to hopefully sort me temps out and another 5850 so loads to do, rather than running it again

:)
 
Hmm, a volume shadow copy error does not say a whole lot. IOH/ICH part could be unstable or it can have no relevance at all - Windows 7 still has permission issues to work out, and it could well be one of them. It is hard to say without the original text of the blue screen message.

But just out of curiosity, did you have the thermal shutdown feature disabled on your motherboard?
 
Yeah, BSOD and reboot.

If you don't really need the 4GHz, and you aren't fussed about getting a true OC, then I should reduce your clock speed to 3.8. I found the last 200 mhz required quite a lot more voltage and so, whilst I was able to get it stable at 4GHz, I run mine day to day as a workstation at 3.8 and it is steady as a rock. I have the voltage set a notch higher than was required to give some headroom, but is still only 1.225V. All power management features and HT are enabled on this OC as well.
 
easyrider said:
Looks like it BSOD and rebooted.

You need to turn restart off at system failure off in system settings-advanced-startup and recovery-system failure and untick the automatically restart box.
Click to expand...

I have this is what was strange...
Never the less it seems that it stopped priming some 15 before it shut down..
So no doubt something to do with it..

datalol-jack said:
Hmm, a volume shadow copy error does not say a whole lot. IOH/ICH part could be unstable or it can have no relevance at all - Windows 7 still has permission issues to work out, and it could well be one of them. It is hard to say without the original text of the blue screen message.

But just out of curiosity, did you have the thermal shutdown feature disabled on your motherboard?
Click to expand...

No I have the CPU thermal shutdown feature enabled set at 95 So may have reached it but doubt it as still shutdown was later..

sampo said:
Yeah, BSOD and reboot.

If you don't really need the 4GHz, and you aren't fussed about getting a true OC, then I should reduce your clock speed to 3.8. I found the last 200 mhz required quite a lot more voltage and so, whilst I was able to get it stable at 4GHz, I run mine day to day as a workstation at 3.8 and it is steady as a rock. I have the voltage set a notch higher than was required to give some headroom, but is still only 1.225V. All power management features and HT are enabled on this OC as well.
Click to expand...

No I don't really need 4GHz,
I do quite a bit of video encoding to divX HD to stream to me TV and even at stock it is much quicker than the E8600 @3.8 I had before..

Other than that I fold and play games... a lot

But the fun in this is pushing it to the limits..

I can run constant folding (SMP) and vantage @ 4GHz at 1.25V cpu in bios..

So I think what I will aim for next is 3.8 at the lowest voltage as like you said the last 200 takes just that little more..

thx

:)
 
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