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post #20831 of 22515
Quote:
Originally Posted by killkernel View Post

As said some post ago, for a cache @ 4.0 Ghz the VRING @ 1,16V is enough for stability.

Try 1,16V and let us know if this setting is suitable even for you. wink.gif

You were the one that mentioned it. Well as I said I tried 1.15v I would imagine 1.16 is not much if any better. 1.2v is not a problem but 1.15 causes BSOD. 1.16 I would imagine would not be stable enough if 1.15 causes bsod fairly easily.
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post #20832 of 22515
I would also figure the voltage that you are stable at may vary from what is stable for others. My uncore is likely not as good as yours.
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post #20833 of 22515
Scouring the internet for some guidance on tertiary voltages, I ran across some advice for SB that I decided to try out. It mentioned a max delta between vDIMM and vSA of .6v, which as it so happens puts my vSA right in the area I was rooting around in but having trouble optimizing.

It went on to mention paying attention to the delta between vSA and PCH voltages. PCH 1.05v upped to 1.10v has now fixed a residual wobble I was having a heck of a time dealing with in the vSA.

Should I go ahead and increase PCH 1.50v to 1.55 to maintain delta between PCH voltages? I have no idea what they're for specifically, only that they're typically used for BCLK OCing.
post #20834 of 22515
Quote:
Originally Posted by dmfree88 View Post

You were the one that mentioned it. Well as I said I tried 1.15v I would imagine 1.16 is not much if any better. 1.2v is not a problem but 1.15 causes BSOD. 1.16 I would imagine would not be stable enough if 1.15 causes bsod fairly easily.

Quote:
Originally Posted by dmfree88 View Post

I would also figure the voltage that you are stable at may vary from what is stable for others. My uncore is likely not as good as yours.

From a little experience achieved testing about 33 CPUs (27 4790K + 3 4770K + 3 Pentium G3258) within a year from this month, i've found that a cache @4.0 Ghz with VRING @1.16V (that is a little more than 1.15V and this 0.01V make the difference... thumb.gif) is stable for Core i7 4790K/4770K and even for Pentium G3258.
For all these CPUs lowering VRING to 1.15V caused instability, infact your experience confirmed this situation.
I know that 1.20V is not so much more than 1.16V but when you're on the edge of achieving OC stability and you're on the high side of temperatures, even a saved degree can make a real difference and a VRING lowered of 0.040V may help to achieve the final result.
Depending on silicon quality there were certain CPUs that with VRING @1.16V were stable with cache @4.2/4.3 Ghz but for that voltage applied this was the best result that i've seen.

Cheers,

KK
post #20835 of 22515
I run 4.2GHz cache 1.17V Vring but I was never bothered to lower it and run extensive testing for it. I know the chip can up to 4.4GHz cache with higher voltages but I really found it easier to OC the cores with this stable setting I know works always.
post #20836 of 22515
Quote:
Originally Posted by killkernel View Post


From a little experience achieved testing about 33 CPUs (27 4790K + 3 4770K + 3 Pentium G3258) within a year from this month, i've found that a cache @4.0 Ghz with VRING @1.16V (that is a little more than 1.15V and this 0.01V make the difference... thumb.gif) is stable for Core i7 4790K/4770K and even for Pentium G3258.
For all these CPUs lowering VRING to 1.15V caused instability, infact your experience confirmed this situation.
I know that 1.20V is not so much more than 1.16V but when you're on the edge of achieving OC stability and you're on the high side of temperatures, even a saved degree can make a real difference and a VRING lowered of 0.040V may help to achieve the final result.
Depending on silicon quality there were certain CPUs that with VRING @1.16V were stable with cache @4.2/4.3 Ghz but for that voltage applied this was the best result that i've seen.

Cheers,

KK

You are right sir! 1.16 has no issues. It is set to adaptive though so it jumped up to 1.208 but I believe when I had it set to 1.2 it peaked at 1.24ish. That is so strange that there is such a defined line right there. It was BSOD nearly instantly in stress testing at 1.15

Will try gaming with it a bit and see how it goes. Report back if I have any issues. Thanks for your expertise smile.gif
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post #20837 of 22515
Quote:
Originally Posted by dmfree88 View Post

You are right sir! 1.16 has no issues. It is set to adaptive though so it jumped up to 1.208 but I believe when I had it set to 1.2 it peaked at 1.24ish. That is so strange that there is such a defined line right there. It was BSOD nearly instantly in stress testing at 1.15

Will try gaming with it a bit and see how it goes. Report back if I have any issues. Thanks for your expertise smile.gif
Exact same experience for me, minus the voltage spike. It's weird to be such a universal trait among CPUs. Nice to have the peace of mind that comes with knowing one of the variables of greatest concern is totally eliminated from the equation, especially while trying to lock down an OC with 2800mhz ram and >1.3 vcore.
post #20838 of 22515
I tried changing to over-ride mode and kept cache voltage at 1.16. It still bumped up during load but only went up to 1.92 then I got a BSOD on run 5 or 6 of IBT normal. It appears it requires adaptive and 1.2v under load to stay stable. Will continue to test but it might need a small bump. Might also be motherboard related.
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post #20839 of 22515
For some reason, changing the PCH voltages upwards .05v each has made my motherboard change one of my DDR VREFs to .70 from its stock .75.

Don't even have a setting for those in UEFI; it just shows up in Command Center and I've never changed them. Doesn't seem to have hurt RAM stability. I may well have 46x/42x/2800 fully stabilized. One more cache multi and hopefully I'll be able to drop vcore a teensy bit.
post #20840 of 22515
Quote:
Originally Posted by dmfree88 View Post

I tried changing to over-ride mode and kept cache voltage at 1.16. It still bumped up during load but only went up to 1.92 then I got a BSOD on run 5 or 6 of IBT normal. It appears it requires adaptive and 1.2v under load to stay stable. Will continue to test but it might need a small bump. Might also be motherboard related.

What is the Core tested frequency?! If i recall well maybe it's @4.8 Ghz...is it right?!
Well, i have a 4770K and a 4790K that on ASRock Z97 OC Formula are fully Prime 95 V.27.9 (AVX1) stable @4.8 Ghz with cache @4.0Ghz with VCore @1,235V in override mode (these settings are stable with 2x8GB DDR3 2666 Mhz C12, for 32 GB of RAM i need much VCore), so try the cache @4.0 Ghz with 1.16V VRING in override mode as said before but reduce the VCCIN to 1.84V even this in override mode.
Give it a try because these CPUs are so sensitive to voltages variations and there are some "magical numbers" that do the right job... biggrin.gif

Thanks for Rep+! thumb.gif
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