What is the intel safe max vcore for i5-4670k?

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Tjorhunter

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I can only reach above 4.2ghz with a vcore of 1.410v. At 4.2ghz I normally have my vcore at 1.270v. The difference of voltages seems a bit extreme to me. So I'm wondering what the max vcore for Haswell is, because 1.4v does seems a bit high.

Cheers
 
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CompuTronix
This will help put the question of Vcore into perspective. This has been the trend over the course of the past 6 generations of Intel processors based on architecture.

From the Intel Temperature Guide - http://www.tomshardware.com/forum/id-1808604/intel-temperature-guide.html

" ... Section 8 - Overclocking and Vcore

Overclocked processors can reach up to 150% of their Thermal Design Power (TDP) when using manual Core voltage (Vcore) settings, so high-end air or liquid cooling is critical. Every processor is unique in it's overclocking potential, voltage tolerance and thermal behavior.

Regardless, excessive Vcore and temperatures will result in accelerated "Electromigration" -...
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Tjorhunter

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It does boot at a max of 4.5v with a vcore of 1.420v and adaptive on. When I turn it to Static it holds for a little bit but it BSODs after about a minute. I really think for this CPU to run at 4.5ghz I'd have to bump the vcore up to something crazy high.
 
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Deleted member 217926

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Unless you have a very good custom water loop 1.4v with Haswell will be dangerous. Most people are hitting 4.4Ghz with just over 1.2v. Now, no 2 chips perform the same. You may have got one of the bad ones for overclocking. I can't imagine what your temps are at 1.4v.
 
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Tjorhunter

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Yeah I just think I'm going to stick at 1.270v at 4.2ghz. It sucks as I bought a NH-U14s cooler just for the purpose of overclocking this CPU, it does stay pretty cool at 1.4v+, but nowhere near as cool as it was at 1.270v or even 1.1v- ish when at stock.

Cheers anyway.
 
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andaja

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WTF, did they change something on haswell in past few months or what? Bought my pc 25d. ago and with i5 4670k i can go to 4.4Ghz with Vcore 1.160 (default Vcore is somewhere around 1.047 i think) and it doesn't go above 45°C
 
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Deleted member 217926

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All CPUs are different. Even 2 chips off the same wafer will have different overclocking characteristics. The motherboard will also make a difference.
 
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Acidfix

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I have a Gigabyte Z87X-D3H MB with a 4670k I run it at 4.2Ghz 1.106 Vcore and it even say's that in CPUZ but in CPUID HWMonitor it say's the Vcore goes up to 1.128 I understand 1.128 is still very good. I just want to know why it shows 1.128 when benchmarking in HWMonitor yet in CPUZ it says my Vcore is 1.106 as that is what I have it set to.
 
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Acidfix

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Yes I believe they have. Because I run at 4.2Ghz on my 4670K using a set vcore of 1.106 yet HWMonitor says it goes to 1.128 it does that same thing at 4.4Ghz

I'm not sure If I got lucky with my CPU or what but I know people with $350 MB's and need to run there vcore at around 1.25-1.3 to get the same OC I am getting. I also run Prime 95 and Intel Burn, along with 3DMark11 to make sure it is stable and I have not had one stability issue. The CPU temp's under Intel Burn go up to 78C but with normal gaming I run 56C in CPU intensive game's.

So I do believe they might have done something with the 4th gen i5's as I bought mine in april/may 2014 and my MB is a Gigabyte Z87X-D3H. I think the reason it show's the CPU VCore go up higher then I have it set on manual because maybe there is a setting the the MB to give it extra power when it need's it but that still does not make sense since it does the same thing at 4.00Ghz 4.2Ghz and 4.4Ghz.

Anyone know what the deal is?
 
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CompuTronix

CompuTronix

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This will help put the question of Vcore into perspective. This has been the trend over the course of the past 6 generations of Intel processors based on architecture.

From the Intel Temperature Guide - http://www.tomshardware.com/forum/id-1808604/intel-temperature-guide.html

" ... Section 8 - Overclocking and Vcore

Overclocked processors can reach up to 150% of their Thermal Design Power (TDP) when using manual Core voltage (Vcore) settings, so high-end air or liquid cooling is critical. Every processor is unique in it's overclocking potential, voltage tolerance and thermal behavior.

Regardless, excessive Vcore and temperatures will result in accelerated "Electromigration" - https://www.google.com/?gws_rd=ssl#q=Electromigration - which prematurely erodes the traces and junctions within the processor's layers and nano-circuits. This will eventually result in blue-screen crashes, which will become increasingly frequent over time.

CPU's become more susceptible to Electromigration with each Die-shrink, so 22 Nanometer architecture is less tolerant of over-volting. Nevertheless, Vcore settings should not exceed the following:

-> Core 2

1st. Generation 65 Nanometer ... 1.50 Vcore
2nd Generation 45 Nanometer ... 1.40 Vcore

-> Core I

1st. Generation 45 Nanometer ... 1.40 Vcore
2nd Generation 32 Nanometer ... 1.35 Vcore
3rd Generation 22 Nanometer ... 1.30 Vcore
4th Generation 22 Nanometer ... 1.30 Vcore

When tweaking your processor near it's highest overclock, keep in mind that for an increase of 100 MHz, a corresponding increase of approximately 40 to 50 millivolts (0.040 to 0.050) is required. ... "

CT :sol:
 
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