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Help overclocking this 4790k on a Maximus Impact VII

post #1 of 7
Thread Starter 
More like, help me stabilize this overclock.

I have the VID (Core voltage) set to 1.184 for 4.4GHz and its rock solid stable (I don't know if this is a good/bad chip thought, if I lower the voltage even by 0.002 it gets BSOD on Prime95) but the issue is that my cooler isn't as great although the it manages to keep the temps at bay at a maximum temp of 75c on prime95 BUT after a 40-60 minutes the core voltage rises, there's this vboost from the aforementioned 1.184v to 1.20.

As all of you might already know, LCC doesn't do anything for core voltage, it's only there for the CPU Input voltage so... I'm left wondering, is there anyway I could keep this voltage to remain at 1.184 all the time? I've already set the voltage to manual in the bios instead of adaptive/Offset, I've also disabled EPU, Intel Speedstep, C state ETC... I really need to get it to work 100% of the time at 1.84 because when it raises to 1.20 the temps also go up to 90c.

what can I do?
post #2 of 7
Thread Starter 
No fellow tweakers around? frown.gif
post #3 of 7
Well, for the high temperatures, you can delid the CPU and get about 15C of lower load temperatures. That is risky though and you should weigh the risks/benefits very carefully before doing so.

Otherwise, if you are not certain, I'd do more stringent tests:
  • At least 2 hours or so of Intel Burn Test at maximum (tests the cores)
  • 12 hours or so of Prime Large FFTs (to test the IMC and L3 cache)
  • 1000% coverage of HCI MemTest (more stringent than MemTest86+)

If any of those fail, you're not stable and need more volts.

You could get away with re-enabling speedstep and the C states, but only after verifying stability.
Edited by CrazyElf - 9/20/15 at 7:54am
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post #4 of 7
I'm a big fan of prime blend. Just make sure to use the custom tab to allow all available ram to be used. Very stressful and best yet repeatable.

Just remember that windows will use some ram. If you set up too much to be used prime will just throttle. I monitor cpu usage with task manager. Also check event viewer for whea errors.
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by CrazyElf View Post

Well, for the high temperatures, you can delid the CPU and get about 15C of lower load temperatures. That is risky though and you should weigh the risks/benefits very carefully before doing so.

Otherwise, if you are not certain, I'd do more stringent tests:
  • At least 2 hours or so of Intel Burn Test at maximum (tests the cores)
  • 12 hours or so of Prime Large FFTs (to test the IMC and L3 cache)
  • 1000% coverage of HCI MemTest (more stringent than MemTest86+)

If any of those fail, you're not stable and need more volts.

You could get away with re-enabling speedstep and the C states, but only after verifying stability.

Correct me if I'm wrong but, wasn't the 4790K a delided version of the 4770k? If not, can you link a guide on how to do it?
post #6 of 7
Quote:
Originally Posted by Dargonplay View Post

Correct me if I'm wrong but, wasn't the 4790K a delided version of the 4770k? If not, can you link a guide on how to do it?

Nope, it's basically a haswell-refresh (devils canyon) which apparently has a better TIM material, but anyway the temperatures are just as bad as the previous generation (haswell) anyway. I wish it was a delidded version. I let my i7 4790K go up to 90C during stress tests. I hope that's not a bad thing in AIDA 64.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by benjamen50 View Post

Nope, it's basically a haswell-refresh (devils canyon) which apparently has a better TIM material, but anyway the temperatures are just as bad as the previous generation (haswell) anyway. I wish it was a delidded version. I let my i7 4790K go up to 90C during stress tests. I hope that's not a bad thing in AIDA 64.

I can just wonder... Why doesn't Intel ship its processor already delidded, it decreases the operating temperature without any downside so why Intel doesn't do it by default!?

Back to t he topic, I found out that prime95 was the only one making my VID core voltage raise by the aforementioned 0.02v then I read about how prime95 could raise the power consumption by a lot compared to normal applications, so I guess it's all fine.
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