4790k won't drop voltage when idle (in c1 state)

bobbyzzx

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Dec 13, 2014
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CPU: 4790k @ stock clock
Mobo: Asus Maximus VII Gene

My 4790k is a good chip I believe, I can do manual 1.1 volt, but it doesn't drop to 0.7v like stock setting at idle, it just stays there. On the other hand stock is @1.28 during load that's way too much than what it needs. I tried adaptive mode but it seems to ignore the "Maximum Turbo Voltage" setting no matter what I set it to unless it's higher than stock, which I found out it's because of the conflict between the BIOS and Haswell internal voltage regulation. So I don't know what the problem is, I even tried manually enable C-state but the voltage still doesn't drop with the multiplier. I really don't want it to stuck at the same voltage, or high voltage at turbo.

Any help would be appreciated!
 
I recommend just using the default settings. If in doubt, just restore the factory defaults.

You'll get 4.4GHz Turbo on default so I don't really see much benefit in overclocking higher which as you've seen can get messy. Alternatively there should be an overclock option in the CPU settings that does a quick overclock which may gain you 100MHz perhaps 200MHz (without messing with Voltage etc). Whatever Asus setup for that board and BIOS version for that CPU.

*I did the quick overclock and went to 4.2GHz however it dropped my DDR3 memory timings. I put that back using "XMP" and ended up with 4.1GHz but the proper 2133MHz for memory. I don't think it did anything "wrong" but I felt more comfortable using the default DDR3 profile.

Again, check DDR3 frequency if changing any CPU settings.

The default settings will properly toggle voltage and frequency in the optimal method.

Other:
a) apply BIOS update if newer exists (that will also set BIOS settings to default), and
b) choose "XMP" for the memory profile and save
c) then download and run the Intel Processor Diagnostic Tool
 

bobbyzzx

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Dec 13, 2014
24
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4,510



I'm thinking about using default setting over constant 1.1v if I can't figure this out, but I wish I could. I'm not so concerning about clock speed but I have the capability to do 4.7Ghz with 1.25, so apparently auto voltage @1.28 for 4.4Ghz turbo is way too much.

a) It's the newest right now
b) I choose not to use XMP because it lock my voltage to 1.28v even at idle, so I manually entered all the setting XMP modifies, end up same mem speed but correct voltage drop.
c) I will try that