How do i undervolt an i7 4790K

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Wayfall

Wayfall

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Dec 27, 2013
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Hi

As the question asks above, how do I undervolt an i7 4790K so to lower the temps?

I'm a complete rookie when it comes to overclocking/underclocking but I have been told I should under-volt due to the high temps.

As the question asks above, how do I undervolt an i7 4790K so to lower the temps?

What CPU Voltage offset do I use, one that doesn't require me to do all this testing.

Cheers
 
Solution
JQB45
The only time you will see 80C+ is likely to be during stress testing and bench marking, most games will only get you to the mid 70C range. Based on my friends experience who owns the i7-4790k and has it in an old case with poor ventilation. I recommend you wait to under vote/under clock until you have evidence of the chip exceeding 80C+ in real world applications.
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Wayfall

Wayfall

Splendid
Dec 27, 2013
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Well I have no idea how to do all this and I don't have the time to do all the testing.

I can't keep my pc on for 24hr straight for testing in my house as I work a lot and I turn everything off when I leave.

There must be a general acknowledged working under-volt that works on all the i7 4790K's
 
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synphul

synphul

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Mar 11, 2011
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Each cpu is different which is why there's no 'ez click' solution. They will all require stability testing though it doesn't take 24hrs to do stability testing. It would help to know what motherboard brand/model you're using to try and help guide you through the bios. Rather than use an offset it would help to see what your actual vcore (cpu core voltage) is currently and whether there really is much room to undervolt without underclocking a whole lot.

What are your current cpu temps? (why are you concerned you need to lower them). What cpu cooler are you using, the stock cooler or an aftermarket cooler? What sort of ambient temps is your pc operating at (what are the room temps like)?

All these things will help better understand your situation so people can help you further.
 
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Wayfall

Wayfall

Splendid
Dec 27, 2013
3,569
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CPU: Intel Haswell Quad Core i5 4460 3.20GHz
COOLER: Cooler Master Hyper TX3
GPU: NVidia GeForce MSI GTX 970 4GB
RAM: Corsair Vengeance DDR3 1600Mhz 2x4GB Dual Channel 8GB Kit
MOBO: ASRock Z97 Anniversary (Socket 1150)
PSU: EVGA SuperNova G2 550W 80Plus Gold Rated Modular
SDD: Samsung 850 EVO 250GB
HDD: 1TB Western Caviar Digital
OS: Windows 7 Home Premium
MONITOR: LG ISP 1920x1080
CASE: Corsair Obsidian 750D Windowed Full Tower
FANS: 1xCorsair SP140mm back exhaust fan (need replacing), 2xNoctua Redux 120mm top exhaust, 2xCorsair SP140mm front intake (need replacing), 1xNoctua Redux 120mm bottom intake.

I haven't got the i7 4790K yet, its arriving today thou and I will be installing it later. I just don't have the best aftermarket cooler at the moment and I have been told that the CPU is a hot one and if I ran if off the stock i would get easy 80-90C but I don't know what I will be getting with my current cooler. I'm worried that I will be get 80C (my house temp is usually 16-19C just so u know).

I get 40C with my current CPU.
 
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synphul

synphul

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Mar 11, 2011
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It is a bit hotter since it runs a full ghz faster and has hyper threading. It sounds as though there's a bit of paranoia based on people's comments rather than your actual situation. Before jumping into undervolting and underclock why not wait until it's actually in your system. Your ambient temps are pretty cool which works in your favor.

Once you've actually got the cpu installed check and see how the temps are. You may be able to lower the vcore some if the bios auto settings give it more than necessary. Or you can likely pick up a solid cooler like a cryorig h7 for around $35 shipped from amazon (if you're in the u.s.).
 
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Wayfall

Wayfall

Splendid
Dec 27, 2013
3,569
12
24,115
Well I was thinking the PH-TC14PE as from benchmarks it can get the CPU down to around 60-70C, my only nag about that cooler is that the first fan would need to be raised a bit for me as I have high profile RAM and so I don't know if the side cover would fit back on or not as I haven't much experience with huge coolers.
 
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JQB45

JQB45

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Jun 23, 2006
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The only time you will see 80C+ is likely to be during stress testing and bench marking, most games will only get you to the mid 70C range. Based on my friends experience who owns the i7-4790k and has it in an old case with poor ventilation. I recommend you wait to under vote/under clock until you have evidence of the chip exceeding 80C+ in real world applications.
 
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