Safe voltage for i7 5820k?

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Alex Zelinsky

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I heard 1.3V is a safe voltage for haswell CPUs. I would like to overclock my 5820k to 4.5 Mhz to see how it fares. Will this voltage shorten the lifespan of a CPU or it shouldn't matter at all?? It's currently OC'd to 4k via XMP profile
 
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DonkeyOatie
XMP is for memory, perhaps you mean a preset.

1.3V is around the limit for 24/7 voltages that I consider safe for long and happy CPU life for Haswell. Temperatures matter too, so I'd want around 60C too.

If a CPU has a 10 year life, I would be prepared to sacrifice a year or two of it. Trying to get to 4.5 or 4.6 won't do very much damage (a month of life at most I'd say), so try it and see what you get.

Are you making money from the system? This changes the calculation.

If you push the CPU to the wall, but earn an extra $2000 a year, you could replace the CPU every year (not that its going to be like that) and still be ahead.
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DonkeyOatie

DonkeyOatie

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XMP is for memory, perhaps you mean a preset.

1.3V is around the limit for 24/7 voltages that I consider safe for long and happy CPU life for Haswell. Temperatures matter too, so I'd want around 60C too.

If a CPU has a 10 year life, I would be prepared to sacrifice a year or two of it. Trying to get to 4.5 or 4.6 won't do very much damage (a month of life at most I'd say), so try it and see what you get.

Are you making money from the system? This changes the calculation.

If you push the CPU to the wall, but earn an extra $2000 a year, you could replace the CPU every year (not that its going to be like that) and still be ahead.
 
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Alex Zelinsky

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It was actually a 2 in 1 preset if you can call it that. With one switch it bumped up my DDR4 memory to 3k and the processor from 3.4k to 4k.
Replacing CPU every year is completely out of the question though :D I get it that it's an exaggeration but the next time I plan to change my CPU would be in 3 or 4 years no less. If it will function to that day I'd probably steel keep it.

So I wanna try and get 4.5 OC right now. What voltage I should go for my first attempt? 1.25? Or something few/more?
 
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DonkeyOatie

DonkeyOatie

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So you changed BCLK to 125 so you could run DDR4-3000 memory. That can have stability issues. I'd try 1.285V, and then tune it down if you can.

I'd be tempted to turn your memory down to 2400Mhz or 2666Mhz if you can get it to run at BCLK 100, then overclock and see what you get. I think it will be more stable that way. After you know what and where you can get to, you and try increasing the BCLK and memory speed.
 
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Alex Zelinsky

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Memory is supposed to run at 3k though. I bought it to run at 3k, it has XMP profile for it already that changes BCLK to 125. Do you think I should disable BCLK? Then I can't run the memory at 3k though
 
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Alex Zelinsky

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Ok I think I managed to get a stable overclock but it was a bit weird at first.

First I booted UEFI defaults with clock speeds of 3.300 and memory speed of 2.133 and default BCLK of 100. And the system wouldn't post every second boot lol. My motherboard would just continiously beep and thats it. Then I'd restart my PC and it would boot just fine.

After this, I upped the BCLK to 125 to get the RAM running at 3k and I upped the CPU ratio to 36 in order to get 4500 MHZ.
(36*1.25=45) I set the vCore voltage at 1.285 and the windows would crash everytime. So I upped the voltage at 1.3 and now it runs stable. I ran the AIDA64 stability test for about 15 minutes to confirm it.

Now I don't really understand why it wouldn't post with default UEFI settings but whatever... Now it works fine I guess

I'm running kraken x61 watercooling. Currently I get around 37C on Idle and 65 at 100% load on silent coller mode. On performance mode I get 60C at full load. Are these temps good? My room temp is around 24.5C
Some pics of CPU Z below

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DonkeyOatie

DonkeyOatie

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I realize your intention, I use 2400Mhz DDR3 a locked Xeon in some of my tests.

To get a good stable overclock is easier if you keep the variables to a minimum. For the moment, I would run the memory slower, at 100Mhz BCLK, you can always speed it back up ;later. It will make things much easier to 'debug' your overclock.

Once you have a stable overclock, you will know that any issues that occur are from BCLK and not the overclock itself. Now, if you have problems, we will be uncertain as to the source.

To boot at 100 BCLK and that memory will require some adjustment to the memory strap voltage.

I'd want to know what Prime95 version 26.6 does to the temperatures.
 
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DonkeyOatie

DonkeyOatie

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Looks good. You need to use something like ASUS RealBench to stress test and benchmark your system to confirm.
 
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Alex Zelinsky

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Looks like I celebrated too soon. :( After a few hours of normal use my pc decided it would be a good idea to screw me over and crash.

So I've tried to bring down BCLK to a default 100 (memory runs at 2666 but whatever)
1.3v 4300mhz
But it still crashes after a few hours and I don't understand.

1.3 should be more than enough for 4300 mhz but apparently it isn't. Am I missing something? Or have I just lost a silicon lottery? Is there any setting I could try? I really don't wanna go above 1.3V since it seems like a safe limit for haswell-e CPUs
 
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DonkeyOatie

DonkeyOatie

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You are right on the voltage. 1.3V is a reasonable 24/7 limit. however, right now, I'd increase it by small steps, but don't go over 1.4V, just to see what it does take to get stability. If you cannot get it stable at any voltage under 1.4, then we need to look at some of the straps or other tuning. 4.4Ghz is a good minimum for a modern chip unless you have REALLY lost the lottery.

Have you read through any i7 5820K overclocking guides?

Have a read through this if you have yet to find it. http://www.anandtech.com/show/8426/the-intel-haswell-e-cpu-review-core-i7-5960x-i7-5930k-i7-5820k-tested/3?_ga=1.19176632.1242543292.1457612374


Did you also increase your VIN to about 1.9V? The i7 5820K has a few more balls to juggle than a Haswell Refresh CPU.
These are earlier chips. With nearly two years of refinement, modern chips should do a little better on average, and/or a little easier.
 
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Alex Zelinsky

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Hey there, sorry for the late answer. So I decided to give this another go but this time I increased DRAM voltage by 0.2V~
At least I don't crash anymore. Not sure if it was the DRAM voltage that did the trick but I'm pretty sure that I kept all other settings the same as during my previous failed attempt.

Now I'm running at
4.4 GHZ 1.3V Vcore
2666 memory speed
Prime 95 results: 75C at MAXIMUM cooler speed (had to set the cooler speed manually thanks to kraken software it allows for an easy speed adjustment on the go) Although it sometimes just barely passes over 80C but never stays there for long.

Cooler is loud is shit but doing its work. Is 75C good for such a test? These conditions are certainly unrealistic though as I barely ever reach 50% CPU usage during my gaming sessions.

Do you think I should try to push for 4.5 GHZ?


Really appreciate your time by the way, you've been of a great help so far




 
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DonkeyOatie

DonkeyOatie

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Those results are fine. Your cooler is working well. The temperature could have been even higher with Prime95. You don't need more and it will probably be too hot as well, BUT 'because it's there' :)

I'd want to know what it would take. I have overclocked my i7 4790Ks and i5 4690K to 4.8Ghz, but I run them safely at 4.6Ghz 24/7 ( and the extra speed is not much extra performance), but I still needed to know what was possible.
 
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Alex Zelinsky

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I brought up CPU clocks to 4500 mhz but kept other settings the same. I kinda don't want to go any further because I have achieved my goal of 4500 overclock. I don't really need a stronger overclock as +1300 mhz result is already very good for me. Although with 4500 it is a tiny bit more hot now (like +2 or +3 C) I don't think it's that important.

Here's to hoping my RAM will work just fine with 1.37 V as this seems like a most important thing that made overclock possible in the first place.

I guess there is not too much difference between 2666 and 3000 ram speeds
I could have went for 4000mhz for CPU and 3000 mhz for RAM instead but I think that current 4500mhz CPU 2666 RAM is a better trade-off. What do you think?

Thank you very much for your help once again
 
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