Overclocking my i5-4670k? What voltages and temps are safe?

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CrucialMove

CrucialMove

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Jan 1, 2014
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Hello all, as stated above, I'm looking to overclock my Intel i5-4670K. My specs include the following:

i5-4670k
AsRock Z87 Extreme4 Motherboard
Cooler Master Hyper 212 Evo
Arctic Silver 5 High-Density Polysenthetic Silver
G. Skill Sniper Series 8GB (2 x 4GB) DDR3-1866
1TB Western Digital Caviar Blue HDD
250GB Samsung 840 EVO SSD
Corsair 600W ATX12V PSU
ASUS Direct CUII GTX 660
Rosewill Blackhawk ATX Mid Tower Case
Windows 8.1

What temperatures/voltages are safe for my CPU? I'm running Prime95, and after 45 minutes my temps are right around 60, and it maxed at 68. Any and all help/suggestions would be appreciated!
 
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vortical


you should use the lowest increments your board supports/that you have...
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vortical

vortical

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Jun 6, 2014
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Those temperatures are more than fine, the max thermal limit on the 4670k is 90c, you should NEVER reach that point. So really you can feel comfortable as long as prime or Intel burn test dont spend a lot of time in the 80's
 
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CrucialMove

CrucialMove

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Jan 1, 2014
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Alright, thanks. What voltage and speed do you think I should go for? From looking around it seems 4.4GHz at 1.250 volts is the starting point, but that seems high to me
 
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vortical

vortical

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When talking about starting an OC, many people go for 4.2 to start out with, as that is a number almost anybody can achieve while being high enough to make a noticeable difference. Honestly when air cooling I wouldnt go above 4.4 or 1.25 V mark since thermals will almost limit you there if not sooner. If you dont already have one, adding a second fan to your evo will help thermally as well for fairly low cost.
 
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CrucialMove

CrucialMove

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Jan 1, 2014
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Alright, thanks a lot. I was planning on getting a water cooler in the future, but don't have the money for it now, so I'll stick with 4.2GHz at 1.200 V for starting and tweak as necessary, increasing at 0.025 V increments. Does that sound about right?
 
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vortical

vortical

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Jun 6, 2014
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you should use the lowest increments your board supports/that you have patience for (usually .005v) but yeah 4.2/1.2v and work slowly down in voltage until you get a crash. a stable OC should be able to run prime for atleast an Hr
 
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CrucialMove

CrucialMove

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Jan 1, 2014
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Awesome, thanks a bunch, I'm going to get started right away.
 
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geofelt

geofelt

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Oct 9, 2006
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How high you can OC is primarily determined by your luck in getting a good chip.

4670K will run very happily at up to 1.25v.
What multiplier you can set at 1.25v is determined by the bin.
Past 1.25v, heat rises exponentially, to the point where no amount of cooling does much good.

I would test with occt.
Set the voltage at 1.25 and gradually raise the multiplier until you reach instability. They back off a notch or two.
Occt will track your temps and shut down the test at about 85c.

The 4670K will downclock or even turn itself off if temperatures get dangerously high. That point is about 100c.

If your stress test is successful, go with it.
Under normal usage, you will never reach those dangerous temps.
 
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