OC i5 4670k bios settings make a HUGE difference

Hi everyone,
I heard that when OC an i5 4670k messing with the power saving features doesn't make much of a difference. Several guides seem to support this, however whilst i was testing different voltages i noticed they absolutely do, at least in my case. I've got my cpu to 4.3ghz on 1.236v.
The settings I'm talking about in particular are:
CPU Enhanced halt(C1E)
C3 State Support
C6/C7 State Support
CPU EIST Function
If i don't have these 4 settings disabled in my bios then i will bsod even if i pump the voltage up to 1.26 and lower the clock speed to 4ghz
What are these settings exactly and why are they making such a huge difference to my OC when i was under the impression the i5 4670k didn't benefit from having it's power saving features disabled. My motherboard is a gigabyte Z87-HD3
Thank you in advance for any insight you can offer, I really want to know if it's safe or advisable to disable these settings.
Reply to jamesa82
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More about 4670k bios settings make huge difference
  1. jamesa82 said:
    Hi everyone,
    I heard that when OC an i5 4670k messing with the power saving features doesn't make much of a difference. Several guides seem to support this, however whilst i was testing different voltages i noticed they absolutely do, at least in my case. I've got my cpu to 4.3ghz on 1.236v.
    The settings I'm talking about in particular are:
    CPU Enhanced halt(C1E)
    C3 State Support
    C6/C7 State Supporto
    CPU EIST Function
    If i don't have these 4 settings disabled in my bios then i will bsod even if i pump the voltage up to 1.26 and lower the clock speed to 4ghz
    What are these settings exactly and why are they making such a huge difference to my OC when i was under the impression the i5 4670k didn't benefit from having it's power saving features disabled. My motherboard is a gigabyte Z87-HD3
    Thank you in advance for any insight you can offer, I really want to know if it's safe or advisable to disable these settings.



    I have read on another forum that disabling power saving features for the cpu can run a lower vcore or be more stable. Meaning it takes a higher Vcore sometimes to use the power saving halt state at overclocked speeds
    Reply to donovansivil
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