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Overclocked and Undervolted

S

STR

Gawd
Joined
Nov 10, 2005
Messages
540
Current build:
7700K @4.7GHz (no AVX offset) with a manual voltage of 1.215. LLC set to Auto (and probably around LLC4)
Cryorig H7
Asus Strix Z270I
Two M.2 SSDs
Thermaltake Core V1 ITX
2 year old GTX 970 from my old MATX tower.

All sitting on my desk and trying to be cool, small and quiet. Gaming temps are ~50c with spikes to ~72, stress temps avg ~70 with spikes to ~85. 4.8GHz would probably require 1.28-1.29 vCore. I'm not 100% sure, as at that level I start hitting the thermal limit. I am too lazy to delid.

TL;DR: I've got a modest OC and UV.

Now for the questions:
1) AIDA and HWInfo64 report a max CPU power level of ~13W, which is like "large tablet" wattage, while simultaneous pushing 70c. This has to be some kind of bug, right?

2) I should stick to my manual voltage, yes? Part of me wants to monkey with offsets, but to be stable with that, load voltages go up to about 1.25v, although I get my .6v idle back. Adaptive mode seems to be not working on my board, as the CPU never downclocks with it on. My fault for being an early adopter (though no SATA cables = clean case).

3a) Part of me, like many of you, want to push the limit. My gut says I could get 5GHz on this thing (probably with AVX offset of ~2). Downside is that I'd probably have to swap out the case/cpu cooler for something bigger or switch to a 240mm AIO. Either of which would result in a bigger or louder case. Could someone please talk me out of this.

3b) Alternative, is there a better air cooler that's less than 150mm tall? The H7 is literally the biggest thing I could put in this case (it's technically outside of case's spec). I've thought about a Noctua U9S with double fans, as the U9S is worse than the H7 with a single fan and I can't fit another fan to the H7 due to MB VRM heatsink.
 
With Manual voltages, LLC may be doing actually little to nothing, so leaving it on Auto is the best option, voltage regulation methods nowadays tend to be way more robust than what it was in the past, so LLC tend to be more useful for Offset and Adaptive Methods.

About the power level, yes that's a bug at worse and a wrong reading as typical, none of those kind of apps measure power draw correctly. I would just ignore it.

About a better cooler in that space, I would with a Noctua NH-C14
 
Welllllllpppp...turns out 1.215 is not 100% stable. It'll stress test or game for hours, but cold reboots won't POST. I've moved to adaptive voltage with a base of 1.220v and no offset and will tweak from there. Under stress it now peaks at about 1.28v, but it also now downvolts when possible, so stress temps are only up 3-5c from the my manual setting while idle is down 5-8c.

I'll mess with LLC after all and try to bring down those peak voltages to 1.23 to 1.24.

EDIT: Got it down to 1.21v stable. The thing runs cool enough during gaming that I had to readjust my fan profiles. It might spike up to 70+ but it also dips down to 40 or less, averaging 55-60c during games. Not bad for a small air cooled ITX box.
 
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