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i7 4790K questions

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  • Overclocking
  • Intel i7
  • Intel
  • 4790k
Last response: in Overclocking
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September 24, 2014 8:18:41 AM

Hey guys,

So I was overclocking my rig last night and my processor would not let me go to 4.7Ghz. I am cooling with a Swiftech H220-x. The 4790K comes at 4Ghz but with a 4.4Ghz turbo and even with a voltage of 1.285 it would bluescreen 5 seconds into prime 95. I have read to never go past 1.3V on haswell so I didnt do that and I clocked it down to 4.5Ghz @ 1.22V. Did I get a bum chip or is there something missing? Build specs are in my signature

P.S. - not my first OC so yes I turned off all of the cool n quiet and auto settings BS

More about : 4790k questions

a c 139 K Overclocking
a b å Intel
September 24, 2014 8:40:32 AM

I think you have an average to good chip.
Those with better chips publish and brag about them; those with dogs keep silent.

I have become a bit jaded on the subject of haswell cooling for overclocking.
How high you can OC is firstly determined by your luck in the bin lottery.
I had high expectations from the Devil's canyon parts and their better thermals.
I found out that the thermals really do not matter unless, perhaps, you are a competitive overclocker.
Haswell runs quite cool, that is, until you raise the voltage past 1.25v or so.
Once you go past 1.3v, then you really do need very good cooling to keep stress loads under say 85c.
But, voltages higher than 1.30 are not a good thing for 24/7 usage.
Even if you can handle the heat, how much do you really need that extra multiplier from say 4.4 to 4.6?

Prime95 may not be the best stress test. Try occt.
I think it simulates more normal operations.

And... under normal usage, you will not stress your cpu as much as a stress test anyway.

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September 24, 2014 9:32:32 AM

geofelt said:
Prime95 may not be the best stress test. Try occt.
I think it simulates more normal operations.

And... under normal usage, you will not stress your cpu as much as a stress test anyway.



That's pretty much what I thought. But at 4.5 in a 6 min prime 95 test I hit 81C on core temp, I know I have seen that people say the temps aren't accurate but HWmonitor always matches my core temp temps and I was not expecting the CPU to get that hot. After that test I did put another fan on the RAD (total of 3 (thats all I can put on the rad)) but the temps doubled from idle to full load in the initial test. I know that its a 22nm architecture and it will get hotter than my old AMD chip but I don't really know what is safe. I read mid 70s for haswell but is there an exception for the 4790?

Sorry if that is kind of scattery, I'm just thinking about a bunch of different things all at once.
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a c 139 K Overclocking
a b å Intel
September 24, 2014 9:45:02 AM

Actually, the limit is about 100c.
The temperature is not the problem, but the vcore.
Once the vcore gets too high, no amount of cooling will lower the vcore at that multiplier.
The quality of haswell is variable, and good chips can reach a higher multiplier at a given vcore compared to lesser chips.

I figure it this way:
Pick a vcore that you will be comfortable running at 24/7.
I suggest that be in the 1.25-1.30 range.
OC only to that level and be happy.
At those vcores, you do not need heroic cooling and you liquid cooler will be loafing.
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September 24, 2014 9:55:59 AM

geofelt said:
Actually, the limit is about 100c.
The temperature is not the problem, but the vcore.
Once the vcore gets too high, no amount of cooling will lower the vcore at that multiplier.
The quality of haswell is variable, and good chips can reach a higher multiplier at a given vcore compared to lesser chips.

I figure it this way:
Pick a vcore that you will be comfortable running at 24/7.
I suggest that be in the 1.25-1.30 range.
OC only to that level and be happy.
At those vcores, you do not need heroic cooling and you liquid cooler will be loafing.


Ok I thought it was about 100c because that's what core temp says the TJmax is and the TJmax was accurate on my old build. I'm probably just going to leave it where its at then, I mean I'm never going to notice .2Ghz anyways
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