I7 7700K undervolting

spree01 · Apr 15, 2017

Hello, I want to undervolt my CPU to lower the temps.

However, I dont seem to be able to go any lower than 1.230 which is pretty high, dropping after this I start to see crashes. Any idea why I can't go lower?

CPU: I7 7700K stock speed
Motherboard: Gigabyte gaming k3 z270

TechyInAZ · Apr 15, 2017

Because that's how 7700k's run. Simple as that. Kaby Lake uses more voltage than Skylake at stock speeds because of the higher clock speeds.

spree01 · Apr 15, 2017

TechyInAZ :

How come people are getting it down to as low as 1.100?

TechyInAZ · Apr 15, 2017

spree01 :

Silicone lottery. Plus, are they underclocking? Or disabling Turbo Boost?

spree01 · Apr 15, 2017

TechyInAZ :

Dont know, but 1.230 still seems way too high, something must be wrong in bios or a simple setting.

TechyInAZ · Apr 15, 2017

spree01 :

TechyInAZ :

Dont know, but 1.230 still seems way too high, something must be wrong in bios or a simple setting.

Just curious, where are you getting 1.230v is too high? Is somebody spreading that around?

spree01 · Apr 15, 2017

What is the downside of turning off turbo boost? Will I get lower fps or whatever?

TechyInAZ · Apr 15, 2017

spree01 :

Downside, lower clock speeds = lower performance. I can't tell you if you'll get lower FPS though, there are too many variables.

spree01 · Apr 15, 2017

TechyInAZ :

Turning boost technoligy of has already given me 1.170 voltage with no crashes.

TechyInAZ · Apr 15, 2017

Yup. Lower clock speeds = lower voltage.

spree01 · Apr 15, 2017

I'm not running lower clock speed, it's still at 4.2
I just turned off boost (it was set to auto boost, 4.4) and 1.170 seems to be very stable.

1.230 is high as other people are getting way lower, and having it at 1.230 gives me around 85c during 100% load. Not that it's that dangerous temps, I would just want it to sit around 75c.

TechyInAZ · Apr 15, 2017

Yes you are still, disabling turbo boost means you can't hit 4.5ghz clock speed. But honestly, 300mhz speed difference isn't a lot.

spree01 · Apr 15, 2017

TechyInAZ :

Well do you think it's worth keeping it and getting 85c on 100% load?

mrobscura · Apr 15, 2017

some chips are better than others. one of mine could do 4.5 at 1.22 and another at 1.20. 1.2- 1.25 for 4.5ghz is the average range so your chip likely just needs 1.23v.

TechyInAZ · Apr 15, 2017

spree01 :

Depends. What are you doing exactly.

I'd say leave turbo boost on if you notice your workflows slowing down more than you want. You can run 100% load at 85C for years and be fine. However it might still shorten the lifespan, but were talking 10 years vs 8 years (if run 100% 24/7), so it's still insanely long for a CPU.

spree01 · Apr 15, 2017

mrobscura :

I'm running 4.20ghz , with turbo boost on. At 1.85. Been running prime95 for 1 hour now and no crashing.

TechyInAZ · Apr 15, 2017

Great awesome!

spree01 · Apr 15, 2017

TechyInAZ :

How long should I run this test to be sure that it's working?

Thanks for your fast and helpful replies btw.

TechyInAZ · Apr 15, 2017

spree01 :

Follow the same rules as overclocking a CPU. I'd say around 8 hours minimum of OCCT and/or your favorite stress tester. Prime95 is a tad overboard.

ilayg6 · Apr 15, 2017

Ive heard motherboards have an effect on how much you can undervolt and i think its right because i can run my i7 7700k at 4.2Ghz at 1.096V
Stable,and on 4.5Ghz at 1.176V btw those are the minimal voltages that i can get the cpu running at stable.
My MotherBoard is:MSI Z270 gaming m3

mrobscura · Apr 16, 2017

spree01 :

honestly, ive never subscribed to the stress test for hours approach. personally, if i can run 2 different stress tests for at least an hour each stable, then im good. its mostly just because i dont want to go 8+ hours without being able to use my pc, and i dont want to leave it running while im not around under 100% load for hours.

spree01 · Apr 17, 2017

ilayg6 :

I have the gigabyte gaming z270 k3 one, couldnt get it under 1.180. Do you have hyperthreading, and boost technoligy on?

ilayg6 · Apr 21, 2017

spree01 :

i didn't touch anything in the bios,because i have an MSI motherboard so i can downclock and undervolt the CPU from their program ''MSI COMMAND CENTER'' ive just downclocked the cpu and undervolt it so I'm pretty sure i have hyperthreading but the boost to 4.5Ghz i don't think so lol because i downclock it to 4.2Ghz so its the fastest that it goes.and its a good temporary solution because you don't lose anything but Dropping your Temps.

milsorgen · May 26, 2017

spree01 :

I'm at 1.095 right now, 10min testing as I go. Trying to bottom out before more rigorous testing. One thing people should think about with 7700k is minding other related voltages in relation to speeds, voltages and temps. MSI for instance cranks things way up and that's what I'm doing tonight/tomorrow bring everything down, everything.

teknobug · May 31, 2017

1.18-1.2v is the sweet spot, definitely lowers max temp.

I7 7700K undervolting

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