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

JonJ678 said:
And similar comments.

I feel I must bring to your attention that 8 hours of prime does not make a system stable. I spent a ridiculous length of time trying to get 4.4ghz out of mine, and the issue wasn't getting prime95 stable, nor intel burn test stable, it was persuading the damned thing to run virtualbox while folding.

You're welcome to consider 8 hours of prime (or 24, or 72, w/e) to be proof of stability. I will not, as personal experience suggests passing prime doesn't mean so much.

I didn't ask you about loadline calibration looking for advice on whether I should use it or not, but rather asking whether you are using it. You're upset that your vcore is higher than other peoples, but if you're not using llc and they are, then this may explain the difference.
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I think you may have misunderstood me. I was interested in what vcore was getting people over 8 hrs prime stability.I understand that that prime is not proof of stability but its a away of stressing all cores for any length of time and its a reference point we can all use.

Now I'm 8 hrs small FFT done and dusted but blend failed after 7 hrs and I got a BSOD.:( I'm not entirely sure whether I have a corrupt Win 7 64 OS now.

I'm not upset at my vcore but I am also not convinced people are getting Prime runs at 1.25v either so I want to see it that's all.

I also believe that people are claiming overclocks for epeen when in fact they are not using these clocks 24/7

I apologise if I have offended you with directness but reading through this thread shows very little evidence of 24/7 usability. I was just interested in wether I have a **** 920 or not.
 
Easy, I was always under the impression if the blend test fails, it's usually an indication that your RAM/IMC isn't stable.

I don't even bother testing Small FFT's, I just do the Blend test when I use Prime.

Are you only tweaking your vCore atm, or are you tinkering with other voltages to?

When I first got this rig and started clocking it properly, I found getting 4GHz using 191x21 was a breeze, however,kinda felt like I was cheating by using Turbo Boost for the 21x multi, so I started trying for 200x20 and things became really tricky, I had to increase my vCore, and Vtt by quite a bit before I could get it stable.

Other things that can help when pushing for 200+ Bclk was CPU and PCIe Clock Drives, default these are set to 700mV on my mobo, however, I have them set to 800mV for CPU drive, and 900mV for PCIe.

I also found that when I set CPU Clock Skew to 100ps, I was able to knock down my vCore and Vtt by a few increments in the BIOS which really helped get my temps down further to.

I am more than happy running my chip at 4GHz, that is more than enough for me tbh.

For my missus's rig that I am using atm I just have it running at 3.32GHz undervolted as her system is on all the time, and even 3.3GHz is plenty!

They really are amazing chips these things, I am so glad I decided to go for an Intel chip when I put this rig together, as I was actually going to build a rig around the Phenom II 940!!!
 
easyrider said:
I think you may have misunderstood me.

I also believe that people are claiming overclocks for epeen when in fact they are not using these clocks 24/7

I apologise if I have offended you with directness but reading through this thread shows very little evidence of 24/7 usability. I was just interested in wether I have a **** 920 or not.
Click to expand...

Ah, that is indeed the case. No apology needed as no offense was taken. Directness is appreciated.

I think it's very likely that people say they're at 4ghz when they're not strictly speaking stable, and it's also possible their sig/post claimed highest clock reached rather than their highest 24/7. I don't really mind, this just suggests they have no real use for their processor. Don't understand epeen at all, I assumed it was a joke for ages but am no longer quite so sure.

I'll post up my current 4ghz settings when I next reboot (due in 7 hours). I don't know if I've bothered to screenshot prime or if I've only got a record of ibt, but since the machine is folding I'm reluctant to loose half a days ppd to get a new screenshot up. I'll push for 4.2 at some point, and will get screenshots up for that.


Conclusions reached from my testing so far
1600mhz at 4ghz is very difficult. I suspect the issue is differences in my ram as Paul managed it with matching sets. Need to try this on lower bsck.
Vcore and qpi take you to 200bsck fairly happily with the x6 ram multiplier.
210 bsck seemingly needed more vcore, qpi but nothing else. Suspect ioh increase to be a placebo.
210 bsck with turbo on benefits from pcie of 102 or 103. Needs significantly more vcore.
6gb with turbo gave random freezes at 4.4ghz. Now suspect more qpi would have fixed this.
pll changes can help, mine has to be 1.7 but this seems to be different for each chip. Similarly cpu/pci clock drive.
qpi and vdimm related, increasing one seems to need the other increasing and vice versa.
IBT (v2.3 at least) isn't very conclusive, ibt stability is a lot easier to get than system stability
 
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DavyBoy said:
Easy, I was always under the impression if the blend test fails, it's usually an indication that your RAM/IMC isn't stable.

I don't even bother testing Small FFT's, I just do the Blend test when I use Prime.
Click to expand...

Yeah my ram was overclocked...I was trying to be clever

Are you only tweaking your vCore atm, or are you tinkering with other voltages to?
Click to expand...

I'm playing with all the settings..I just wanted the lowest vcore I could manage for 4.ghz rather than go wading in at 1.35v:p

When I first got this rig and started clocking it properly, I found getting 4GHz using 191x21 was a breeze, however,kinda felt like I was cheating by using Turbo Boost for the 21x multi, so I started trying for 200x20 and things became really tricky, I had to increase my vCore, and Vtt by quite a bit before I could get it stable.
Click to expand...

4ghz is a breeze but getting it fully stable under full load with HT on is not so easy.I'm trying 1.285v now and want to keep it under 1.3v if I can...This was my point with other peoples lack of screenies under stress...Those voltages I see would not be enough for some stability tests in my experience and they are fooling themselves they have a fully stable system.


What vcore are you running for a 4ghz 24/7 overclock?

Other things that can help when pushing for 200+ Bclk was CPU and PCIe Clock Drives, default these are set to 700mV on my mobo, however, I have them set to 800mV for CPU drive, and 900mV for PCIe.

I also found that when I set CPU Clock Skew to 100ps, I was able to knock down my vCore and Vtt by a few increments in the BIOS which really helped get my temps down further to.

I am more than happy running my chip at 4GHz, that is more than enough for me tbh.

For my missus's rig that I am using atm I just have it running at 3.32GHz undervolted as her system is on all the time, and even 3.3GHz is plenty!

They really are amazing chips these things, I am so glad I decided to go for an Intel chip when I put this rig together, as I was actually going to build a rig around the Phenom II 940!!!
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Yeah they are great chips and I will nail this overclock!!!!!!:cool:

Last thing I want is a BSOD when rendering out my HD cam footage
 
I don't have my own rig up and running atm mate, but off the top of my head my vCore is set to 1.265v in the BIOS which gives me about 1.236v under load in CPUZ.

Gonna buy a DMM soon so I can get true readings instead of relying on software.

When I try going beyond 4GHz is when I started having trouble with my rig, I have to push vCore and Vtt quite a few notches higher in the BIOS to get it stable at 4.2/4.4GHz, this is the main reason I choose to keep it at 4GHz for the most part.

However, once I get my rig built up again I should hopefully be able to use 4.4GHz for a 24/7 clock, as I am doing a huge overhaul on my WC loop, moving from a triple rad to a quad and double, so hopefully this will improve my temps a little bit!!

I've also got myself a new mobo (just bought it now), and I will be getting some faster RAM to once I sell my Gigabyte UD5, so the next few weeks should be pretty exciting for me, I am looking forward to it!!! :D
 
OK I need some input

I blended last night and woke up to a BSOD :(

DSC_2128.jpg


I am just running memtest to make sure I have no errors on the ram...

This is driving me nuts...Could it be a driver issue?

Small FFT passed 8 hrs no problems....My ram is running at 1563 MHZ and its rated at 1600MHz to take that out of the equation.

I'm tempted to reinstall win 7 64 and run blend again tbh.

Thoughts?
 
It's also worth noting that the i7 920 only officially supports RAM at upto 1333MHz, so it probably isn't just a case of whacking it to the right voltage and timings for the RAM and expecting it to work.
 
Danny_75 said:
I have an 860 as sig. Seems in the most to be quicker than the 920s.

What cooling you going for?

Can give you some settings but tbh all CPUs are dif so will have to play about.
Click to expand...

I'm buying Venomous X and 2 Akasa Apache fans. I think it should be enough for a little bit overclocking :)

I was expecting it yesterday but never came. I will have it with me on wednesday so I still have few days to learn all the tricks. Any help would be much appreciated :)
 
Memstest passed without error..I have just come back Manchester 4 hr round trip and it was error free.

This was running the system overclocked at 4ghz with The ram at 1563mhz.

Any way just flattened the PC and reinstalling windows. I will install chipset drivers gfx card drivers Cat 10.2 for win 64 and run blend again.

All my settings seem typical of this overclock...So I'm hoping maybe I screwed up the install when clocking that C0....It did BSOD a few times before even booting as it needed 1.4v just to boot at 4ghz.
 
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