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Overclocking an i7-875k on an asus p7p55-d-e-pro.

post #1 of 11
Thread Starter 
I've had the system for a few years now (see Falcon2010 in sig). I bought it from FalconNW and they overclocked it for me originally, they put the base clock at 155.5. I've bumped up the boost multipliers on the unlocked cpu since then and am running stably at 3.73GHz, but I can't bump the boost multi any more w/o going unstable. Hyperthreading is enabled, want to keep it that way. It idles at a multi of 9, and when any core(s) are active, jumps to a multi of 24.

I know the 875k isn't the best overclocker, but I think I can reasonably safely get a little more out of it w/o adding fans. And maybe even more with adding another pull fan on the radiator. I don't want to add a fan just yet.

Yesterday I tried to bump up the boost multi by 1 one, leaving everything else the same, that puts the CPU at 3.89. System booted and windows started up just fine, so I fired up a wPrime95 torture test with my temp monitoring tools running. Temps looked fine, high 60s with one core touching 70, pretty much the same as the do at 3.73. But 25 minutes in... BSOD 0x124 WHEA_UNCORRECTABLE_ERROR.

So I guess if I really want to go higher, I'll need to play with voltage levels. I haven't done that before, so I thought I'd start a thread here to make it less scary and to help prevent me from doing something stupid.

I have found this, http://www.masterslair.com/how-to-overclock-intel-core-i7-i5-i3-cpu-overclocking-guide, to help guide me.

I have an AIO liquid cooler, an Asetek 550LC, which seems to do an ok job. My current max core temps while being tortured with prime95 for up to an hour: 71 67 66 68. I think I have some head room to go higher. I think I'd be ok with 5c higher. I don't really have any clue how much upping voltage/clock will affect that temp, but I guess I'll find out soon enough.

My plan is to up the Vcore value (currently 1.272) without changing clock speeds. Then measure how much impact that alone has on temps. Then go from there... maybe back off and call it a day, think about adding a pull fan on the radiator some other day... maybe up the boost multi by one more and see if its stable.

I do not plan to alter the BLCK setting. That way the Vimc and memory in general should be good as is. I'll just hold that constant for the sake of simplicity.

Also, I have a good quality 750W PSU and I've got a modestly overclocked GTX 670 (120% power limit) on it too. I think I'm still safely under my power budget. If I'm not someone please yell.

Just looked in the BIOS at the voltage settings. The overall voltage settings are set to [Manual], but Vcore and Vimc are individually set to [Auto]. Currently, the Vcore value floats between 1.264, 1.272, and 1.28 depending on how busy the processor is. The guide I found says to bump Vcore up in increments of 0.025. Being very conservative, I guess my first stab at it will be to plug in manually a value of 1.272 + 0.02 == 1.292.

I'll wait till tomorrow to poke at this for real so I have the benefit of whatever responses anyone whose read this far might have. Thank you for reading.
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Falcon2010
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post #2 of 11
Thread Starter 
These old threads from when the Lynnfields were new is helpful.
http://www.overclock.net/t/605848/i5-i7-lga-1156-overclocking-guide-to-4ghz
http://www.overclock.net/t/572002/intel-core-i3-i5-i7-lga-1156-club-discussion

I see some [official] clubs for the more modern processors have spreadsheets with members stable settings listed. Maybe I can dig up an old document with a collection of stable i7-875k settings.
Edited by michael-ocn - 3/8/13 at 10:39am
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post #3 of 11
Thread Starter 
Ok, giving this a whirl as I type.

I upped the Vcore to 1.29375, rebooted and ran enough prime95 (5 minutes) to see that temps were not dramatically different then before. Added another boost multi, rebooted an am 10 minutes into running prime95's blend test. We'll see what this looks like in 20 minutes or so.

I took note of the other voltage settings and actual values in my BIOS while i was in there.

Vcore: manual@ 1.29375, actual@ 1.304
IMC: auto, actual@ 1.215 - 1.240
RAM: manual@ 1.5, actual@ 1.496
PLL: auto, actual@ 1.8
PCH: auto, actual@ 1.046

So far so good max temps: 74, 72, 70, 72 @ 3.89GHz and 1.3v
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post #4 of 11
Well, 3.73 GHz @ 1.3v seems nice enough. Also the temps are pretty acceptable considering it's an LCLC.

You may also consider reading this guide if you ever want to aim for a higher OC. It made me reach nice OC's on both my i3 and my Xeon (i7), both Nehalem as well.

Almost all i7-8xx's were able to reach at least 4 GHz with decent cooling and a bit more juice, and you could do it if you tweak the bclk a bit more. If you do not want to OC the RAM, you might want to lower the divider and boosting the bclk. You do have an advantage with the unlocked multiplier though.
   
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post #5 of 11
Thread Starter 
Woohoo... it survived an hour of prime95 torture... max temps 75, 73, 71, 74... with the new voltage and clocks, temps have gone up by about 5c from my old settings, I'm ok with that.

Yea, I'm pretty happy with the LCLC really. I have the option to get more out of it by adding a 2nd fan, right now there's just one fan pushing. I'm not sure how much additional thermal head room adding a pull fan would give me... but some. Thnx for the link, I'll take a look.

An unexpected thing is that I entered 1.29 in my BIOS for Vcore. It snapped that value to 1.29375 in the BIOS ui. But then everything (BIOS, CPUZ , HWMonitor) report an actual value ranging from 1.3 to 1.32. So I went up on the voltage more than I intended to. The extra voltage upping might give me even more room to go up on stable core clock speeds.

If I up'd the BCLK to 160, I'd be exactly at 4G with my current boost multi of 25 and the RAM would be running exactly at its rated speed. I might try that at some point. I was wary of poking at the BCLK because then I have to question those other voltage levels and ram timings. If i just up the boost multi to 26, the core would be at 4.04, idk, might try that at some point too.

But for now, I'm going to run with it at 3.89 and see if its stable in real world usage and doesn't get too hot while gaming... and update my sig and rig info to say 3.89GHz smile.gif
Edited by michael-ocn - 3/8/13 at 9:35pm
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Falcon2010
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post #6 of 11
Quote:
Originally Posted by michael-ocn View Post

Woohoo... it survived an hour of prime95 torture... max temps 75, 73, 71, 74... with the new voltage and clocks, temps have gone up by about 5c from my old settings, I'm ok with that.

Yea, I'm pretty happy with the LCLC really. I have the option to get more out of it by adding a 2nd fan, right now there's just one fan pushing. I'm not sure how much additional thermal head room adding a pull fan would give me... but some. Thnx for the link, I'll take a look.

An unexpected thing is that I entered 1.29 in my BIOS for Vcore. It snapped that value to 1.29375 in the BIOS ui. But then everything (BIOS, CPUZ , HWMonitor) report an actual value ranging from 1.3 to 1.32. So I went up on the voltage more than I intended to. The extra voltage upping might give me even more room to go up on stable core clock speeds.

If I up'd the BCLK to 160, I'd be exactly at 4G with my current boost multi of 25 and the RAM would be running exactly at its rated speed. I might try that at some point. I was wary of poking at the BCLK because then I have to question those other voltage levels and ram timings. If i just up the boost multi to 26, the core would be a 4.04G. Idk, might try that at some point too.

But for now, I'm going to run with it at 3.89G and see if its stable in real world usage and doesn't get too hot while gaming... and update my sig and rig info to say 3.89GHz smile.gif

Nice! For a true stability test i recommend at least 18 hours of Prime, 24 is the sweet spot for 99.9% stability (i'm a believer that, if you OC, you're never 100% stable, but 99.9% is good enough tongue.gif)

The voltage increases may come from disabling a feature called Load Line Calibration. In short, when you take a CPU to 100%, it lowers the voltage per Intel's specs. Turning this feature off, you can "force" the motherboard to maintain the same voltage or even give it a tad more to maintain stability. I've always used it and it has never given me any issues at all.

The guide i linked you to teaches you how to get the most of BCLK OCing, including explaining what each voltage does and exactly when to move it, so you do not get lost at all. It's very easy to understand, you should give it a shot.

4 GHz is like the minimum OC you'll be able to reach on it so you cold try and aim for 4.2-4.4 GHz (even so, 4 GHz would be your best heat/performance balance), and remember, Prime temps will always be higher than gaming/browsing temps. In stress testing, the CPU will always be @ 100%, but on gaming or other activity it will not be, lowering temps by up to 7-8c. After testing Prime, i recommend you running several loops of the Crysis, Unigine and 3dMark benchmarks, to be sure you're also stable on 3D apps and to have an idea of your real gaming temps.

LCLC's rarely get a huge performance increase on push-pull due to the cheap rad and weak pump, unless you use mounstrous fans, like some 38mm Panaflos/Deltas. But even so, you could shave an extra 2-5c by adding a second fan.
Edited by Starbomba - 3/8/13 at 9:47pm
   
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post #7 of 11
Thread Starter 
I will take a look at that guide then to get some clue about the various voltage settings.

I'm about to run Heaven and Valley to see if they run and what scores come up as now. Then maybe play some borderlands2 smile.gif

What if i run 24 hours of prime in one hour doses, does that count? I don't like the idea of leaving it full on at max temps for that long really.

Kinda disappointing to hear that an extra fan would buy so little, oh well frown.gif
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Falcon2010
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post #8 of 11
Thread Starter 
Another thought is to drop Vcore back down some since it bumped up more than I expected. It was effectively 1.28 when the cpu was working hard before, now its up around 1.31 or 32. I really was trying to up it by .02'ish but when switching from auto to manual, it overshoot that target. Might be stable at a slightly lower voltage with the new clock... and run a little cooler.
Falcon2010
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Falcon2010
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post #9 of 11
Thread Starter 
An update. For the heck of it, I tried up'ing the boost multi by one more to x26, leaving everything else the same (vcore 1.3'ish, bclk 155'ish). That makes for 4.04GHz. System booted into windows, so started up prime95... but didn't make it very far at all, about 5 minutes in... BSOD 0x124 WHEA_UNCORRECTABLE_ERROR.

So backed down to x25, which has survived a total of about 3 hours of prime95 torture now, not in one go, but spread out over a few runs. The 3.89GHz overclock has demonstrated that it works just fine in the real world too, I've done a fair amount of farcry3 and borderlands2 playing with it.

Oh well, wishful thinking that 1.3v would be enough to get me over 4GHz. Upping the voltage again would probably increase temps again by a similar amount (5c), and I'd be out of my thermal comfort zone. I think I'm done playing with it for now.
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Falcon2010
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post #10 of 11
Thread Starter 
I'm back again for some more playing around with my Facon2010 system, this time instead of going up speed, to go down on voltage/temps and retain the current speed. This comment from two posts up...

> Another thought is to drop Vcore back down some since it bumped up more than I expected (when switching from an auto to a manual value)

Since I'm not going for a higher clock, might as well bring down the temps as much as I can. I've lowered the vcore manually value entered in the bios from 1.293 to 1.281. I have roughly .005v increments to work with on that setting, so that's two notches down. Prime95 has been torturing it for about 50 minutes now with no problems. Temps are a few degrees cooler, max of 73 vs 76 at the higher voltage. If this ultimately proves unstable, I think I've got reason to believe that the next .005 step up in voltage will prove to be stable.

A manual setting of 1.281 turns into an actual value of 1.304 when under load according to cpuz.

There are all kinds of opinions about max "safe" temps, I've read numbers ranging from 72 to 100c. Seeing as I really have no clue, I lean hard to the safe side.

As soon as prime95 makes it through another 10 minutes and then the system survives an evening of some regular usage, I might be done fiddling cpu clocks until I get a new rig.

edit: survived an evening of usage just fine, now i'm wondering if i can go down another .005v?
Edited by michael-ocn - 3/20/13 at 11:20pm
Falcon2010
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Kickass-X99
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Falcon2010
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KeyboardPowerCaseMouse
Rosewill RK-9000BR Silverstone Strider Plus 750 Silverstone Kublai SteelSeries Sensei [RAW] 
AudioAudio
Sennheiser PX100 headphones AntLion ModMic v4 
CPUMotherboardGraphicsRAM
i7-5820k | core@4.4 1.23v | cache@4.1 1.1v ASUS X99-PRO / USB 3.1 EVGA GTX 980ti FTW Crucial Ballistix Sport 2400 CL12 (4 x 4GB) 
Hard DriveHard DriveHard DriveOptical Drive
Crucial MX200 (1 TB) Crucial M500 (960 GB) Western Digital Green (2 TB) Pioneer BDR-XU03 
CoolingOSOSMonitor
Swiftech H240-X Win 10 Pro (64 bit) Linux Mint 17 Cinnamon Asus ROG Swift PG279Q 
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Rosewill RK-9000BR Silverstone Strider Gold 850 Phanteks Enthoo EVOLV ATX (gray) SteelSeries Sensei [RAW] 
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