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Haswell 4670k safe stock clock undervolt?

post #1 of 6
Thread Starter 
Yep, I know its a K model. Just testing boundaries.

What is a safe under-volt for stock clock with turbo 3.8 enabled?

Been fighting temps on my GA-Z87-UD4H. So far with stock clocks its crazy heat. Using a Hyper 212 Evo.

Stress Test P95 blend and/or Small FFT. Also IBT 2.54: Very High
CoreTemp 1.0 RC5 (Max core temp, not average)

Bios vcore: Auto (stock 1.13 and kicks up to 1.25v during stress test)

Hyper 212 Evo + Included CM paste = 94c
Hyper 212 Evo + AC MX-2 paste = 88c
Hyper 212 Evo Lapped (1k grit) + AC MX-2 paste = 84c

Just started under-volting and testing 1.075v Manual Vcore. Currently running P95 Small FFT for 20mins as of writing.

Hyper 212 Evo Lapped + AC MX-2 paste = 68c

Edit: IBT 10-pass SL:Very High = 71c
Edited by roguetrip - 8/25/13 at 8:19pm
post #2 of 6
It should be fine as long as it's stable. I managed to get sub 1v for 3.3GHz on my 2500k, though I never run it at that.
post #3 of 6
There is no "unsafe" undervolt level. Just do it until the computer is not stable, and then bump it up a tiny bit to make sure your system stay stable.

Haswell CPUs have a max temp of around 95C so even with the EVO+MX2 you should be fine if you don't overclock.

BTW This will void you warranty because the CPU will be running out of Intel Spec!!

Edited by fishymamba - 9/1/13 at 9:48am
post #4 of 6
what's the purpose of undervolting?
post #5 of 6
Originally Posted by abombthecoder View Post

what's the purpose of undervolting?

Lower power consumption and cooler operating temperatures.
post #6 of 6
This is actually what I like to do. I try to make my builds as quiet as possible so I go for low voltage overclocks. The chips are always given quite a bit more voltage than required at stock. You said the stock voltage is 1.25 under load. Change it to manual voltage (I wouldn't bother with offset right now) and try 1.15. If you boot into the OS fine and don't notice any performance issues, try stressing it a little. Keep going lower until stability issues pop up (you'll usually get a BSOD during a stress test). Once this happens just add a little voltage back on and you're good to go. I wouldn't worry about damaging anything. It's when you go for really extreme overclocks that you need to be more careful.
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