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i5-4670k Temps, Voltages, and Overclocking - Does this look OK?

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January 17, 2014 10:22:42 PM

I have an i5-4670k processor. I have been overclocking it lately. Currently, I am running a prime95 test as I write this. This current test, I have my processor overclocked to 4.2 Ghz. Here is a more detailed idea of what I am running on my cpu:

4.2 Ghz
1.235v with .005v offset
2.050 VCIIN (I think I can lower this for next run)
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4.0 Ghz Cache
1.15v Cache

My temperature is hovering around the 85/86 degrees Celsius mark. I am using an H80i cooler that I (2 days ago, so it hasn't fully cured) applied Arctic Silver 5 thermal paste to, and reseated.

I am also running the integrated HD 4600 graphics with LucidVirtu as it makes a big difference with it's virtual V Sync, particularly on Far Cry 3, but I digress.

I would also like to point out that, just now, (As in, my computer just recovered, and Firefox saved all my work) my computer restarted during the Prime test about 45 minutes in. However, I did NOT receive a BSOD and I also, peculiarly, did not receive the usual message saying my Overclock had failed. In fact, I'd almost tie that rest in to a PSU failure. Any input on this is appreciated, but it is not my main concern.

**(My PSU is a EVGA NEX750B, it has 4 rails, with only 20A on each one, which has caused problems for my GPU overclocking, I wouldn't be surprised if it slipped on me here, what do you think, OC not stable, or PSU?)

My main concern, is that with these voltages and temperatures, and the consideration that I am running integrated graphics as well, does my CPU seem to be handling overclocking OK, or should I look in to changing anything. Thank you for your help.

PC Details:

    i5-4670k
    MSI Z87-G45 Gaming MOBO
    G.Skill Ripjaws 1600 Mhz at 1.5v
    Sapphire Radeon HD 7950 (100352-3L)
    EVGA NEX750B
January 17, 2014 10:28:18 PM

Going over 60c is a bad idea! it shortens CPU life intensely, buy mater cooling or lower the overclock that's a really bad temp
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January 17, 2014 10:30:46 PM

Windows may have even shut you pc down due to the temperature, but it usually just lets you keep going til you break everything
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January 17, 2014 10:40:52 PM

Those temps are definitely high. You atleast want to get it under 70 C. Have you tried finding the lowest voltage you can run at? If so, you may need to lower OC to lower volts.
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January 18, 2014 8:38:16 AM

I just did 6 hours of Prime, 4.2 Ghz, at 1.235v, It did not have the random shut down that occurred earlier. If I go to 1.230v, the Overclock will fail, so 1.235v is the lowest I can go, However, I can run at 4.1 Ghz at 1.850v and it reach ~79 degrees Celsius.

The CPU can idle anywhere from 20-30 degrees Celsius. So idle temps never gave me a cause for alarm. I'm hearing that 80 degrees is high, I'm using a H80i water cooler, and 4.2 isn't that high of an overclock, even if it does seem to use more volts.

I'm fairly certain I'd have to be at stock speeds to run under the 70C range. Is this because of the iGPU? Or is there something wrong with my cooling?
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January 18, 2014 11:38:34 AM

You may just have gotten unlucky with the silicon lottery. Do you have a graphics card you can install and see if that changes anything, though I don't think its the igpu. Maybe watch some haswell oc tutorials to see if theres anything you can improve
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January 18, 2014 12:47:47 PM

johnnyp23 said:
You may just have gotten unlucky with the silicon lottery. Do you have a graphics card you can install and see if that changes anything, though I don't think its the igpu. Maybe watch some haswell oc tutorials to see if theres anything you can improve


I am using a Radeon HD 7950, I'm using both iGPU and Discrete card at the same time using LucidVirtu. I just reseated my H80i. (Cleaned the CPU and copper plate, and prepared the copper plate like Arctic Silver recommends for Haswell). The idle temps look about the same, and the Load temps don't look much different.

I've seen elsewhere that Haswell runs hot, and that 80-90C really isn't too much to worry about, I just wonder why it's so hot for such a low clock.

Oddly enough, core 4 (or core #3 as recognized by the computer) runs about 10 degrees cooler than the other four cores.

How many degrees should I expect to drop during the Arctic Silver 5 curing period?

Edit: However, I'm pretty sure I didn't win the lottery, It doesn't seem to be as bad as some other chips I've seen regarding voltage, still, I would've liked better.
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January 18, 2014 8:42:18 PM

Another thing that I have a question about regarding temperature is this;

Core 3 Idles about 5 degrees warmer than the other cores. It was the same way before I reseated the H80i.
Under load, core 4 runs about 10 degrees cooler than the other three cores, and core 3 is right in line with the 1 and 2, not 5 degrees warmer as you'd expect.

Something tells me that this is because of the wonderful TIM application that intel used on the Haswell chips, that, unfortunately, can only be solved by delidding. I do not particularly want to de-lid my CPU at the moment. Can anyone back this up, or do you have and idea of why my temperature is the way it is?

As far as 60-70 being too hot, from what I've read on other threads, under 90 degrees under a load test such as Prime95, is OK. But what I'd like to know is:

Is my temperature too high for my respective overclock?

EDIT: I should also point out, I am running the Small FFTs test in prime95, so it will be generating the most heat.
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January 19, 2014 10:24:59 AM

In my limited Haswell OC'ing experience I'd say those temps are high and you would want to keep them at or below 80C. The core#4 being 10C cooler seems to point to bad tim under the lid.

I'm running an i5-4670K @ 4.4GHz with 1.23v right now and during Intel Burn Test on high my max my temps are +/- 70C
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January 19, 2014 10:34:02 AM

60c is no where near bad lol. stay under 80c. use intel burn test for temps and voltage flucuations on initial stablity, then use prime as a final long term stability. even then is likely any cpu running at true 85c core temp 24/7/365 will last for at least a decade not counting natural failure rates. almost every laptop cpu will hover around 80c its whole life.
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January 21, 2014 2:58:34 PM

Dom_79 said:
In my limited Haswell OC'ing experience I'd say those temps are high and you would want to keep them at or below 80C. The core#4 being 10C cooler seems to point to bad tim under the lid.

I'm running an i5-4670K @ 4.4GHz with 1.23v right now and during Intel Burn Test on high my max my temps are +/- 70C


I think you're right about the TIM under the lid, maybe at the end of my warranty I'll open it up and change that. Until then, it looks like I'll stay at a modest 4.2 Ghz overclock.

nikoli707 said:
60c is no where near bad lol. stay under 80c. use intel burn test for temps and voltage flucuations on initial stablity, then use prime as a final long term stability. even then is likely any cpu running at true 85c core temp 24/7/365 will last for at least a decade not counting natural failure rates. almost every laptop cpu will hover around 80c its whole life.


Thanks, looks like I won't be going any higher for a while. Latest re-application seems to keep it a little cooler under load, but doesn't do anything for the idle temps, which, if anything, increased a little.
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January 21, 2014 6:22:09 PM

I was just re-reading your original post and thought I give ya my two cents on the PSU.

EVGA makes great GPUs. I have one now and I am 100% sure that when I upgrade it will be another EVGA.

20A on the 12v rail is not good enough period. You may want to get a higher quality PSU by Corsair or SeaSonic, especially if you are going to OC.

All PSUs factor in some voltage variation and whatnot. Better quality PSU's have tighter limits on these variations which helps ALOT with OC which is greatly effected by small variations (the higher you go the more the effect of even smaller variations)

BTW not sure if you're interested but to attain my OC the only bios changes I made(other then set the XMP profile on RAM) were: set core multipliers to 44 and manually set Vcore to 1.23 and that's it. no messing with cache or cache volts. You may want to give that a try to see if it helps with temps ;) 
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