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3770K offset vcore vs fixed vcore on asus MVE board - offset always hotter under load?

post #1 of 6
Thread Starter 
hey people,

just a quick question regarding overclocking on asus boards (MVE here) and 3770K.

I come from EVGA boards and never had a chance to use offset vcore until I switched to ASUS. today was my first day with offsets and despite some initial goofs (e.g. booting to windows to discover I'm running 1.64V vcore doh.gif ) I got it right eventually biggrin.gif

my question is, is offset vcore always producing slightly (1-2C) higher temps under load versus fixed vcore? I understand offsets are great for daily running especially in Windows Balanced Power mode (multi downlclocking enabled with EIST and lower voltage at idle so on).

also, is sticking to Ultra High LLC (75%) the best route or maybe I should try High LLC (50%)?

my results of 3770K:
4.7GHz w/ 4x4GB @ 2200MHz 10-11-10-30 2T
multi 47
PLL default 1.80v enabled
LLC UH 75%

1. fixed vcore
vcore 1285 (first one WHEA clean under IBT)
max core temps up to 91C
2. offset
offset +0.050 (first one WHEA clean under IBT)
max core temps up to 93C

4.8GHz w/ 4x4GB @ 2200MHz 10-11-10-30 2T
multi 48
PLL 1.85v enabled
LLC UH 75%

1. fixed vcore
vcore 1340 (first one WHEA clean under IBT)
max core temps up to 100C
2. offset
offset +0.105 (first one WHEA clean under IBT)
max core temps up to 102C

For offset vcore I switched the CPU Power Phase to Optimal in Digi+ menu
For fixed vcore I used the CPU Power Phase at Extreme setting (default) in Digi+ menu

asking mainly, because I was trying to get to 4.9GHz and stabilize it and was looking for a different approach than fixed vcore (looking for lower under load temps that is), but that OC is too hot for IBT stress testing... not even sure if Prime95 won't be too hot (haven't checked yet), trying to find a new OC for benchmarking smile.gif

thanks!
Edited by feniks - 10/1/12 at 9:30am
post #2 of 6
The higher your LLC level, the lower the offset needs to for the same LOAD vcore.
But with a High LLC Level, the ''inbetween load states'' get lower voltage because of the lower offset.

I achieve best Offset Overclocks by using a Low LLC Level, and a High Offset.
So you dont get crashes on idle/medium load/gaming.
(With high llc i was stable but would get random crash once in a time on mild load)

So maybe try a low llc + high offset and maybe you get better temps in the end.
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by prescotter View Post

The higher your LLC level, the lower the offset needs to for the same LOAD vcore.
But with a High LLC Level, the ''inbetween load states'' get lower voltage because of the lower offset.
I achieve best Offset Overclocks by using a Low LLC Level, and a High Offset.
So you dont get crashes on idle/medium load/gaming.
(With high llc i was stable but would get random crash once in a time on mild load)
So maybe try a low llc + high offset and maybe you get better temps in the end.

thanks man! rep+ smile.gif

That makes sense. I am new to offsets and I couldn't find any specific information on this topic. it was also my first approach on them and I simply followed some general ROG guide on it (Raja@ASUS suggested using Ultra High LLC and Optimized CPU Phase settings).

Here is the guide I used for trying out offsets fr the first time in my life:
http://rog.asus.com/forum/showthread.php?2162-Overclocking-Using-Offset-Mode-for-CPU-Core-Voltage

I will try 25% LLC and see what I can get, higher offsets are fine, I don't mind having slightly more vcore at idle as long as it is below 1.2v

May I ask what setting did you choose for CPU Phase control? BIOS default on my board is Extreme (that's what I used for manual vcore overclocking at first), but for vcore offset the guide I used suggested using an Optimized setting instead (and so I did). not sure what difference it makes... should I keep it on Optimized or rather Standard or Extreme? That setting is in Digi+ (advanced power options for phase profiles, VRM frequencies, etc.)
Edited by feniks - 10/1/12 at 9:20am
post #4 of 6
Thread Starter 
sweet! biggrin.gif

have just stabilized 4.8GHz using 25% LLC and +0.175 offset. it's fully stable under IBT (same actual vcore under load as it showed with 75% LLC and +0.105 offset) and temps under full load dropped by a good 2C at least, that is simply awesome! biggrin.gif

Thanks for giving me a useful hint, highly appreciated! smile.gif

Now, I stand a chance to aim at 4.9GHz ... once I cool down my room ambient that is wink.gif
post #5 of 6
Thread Starter 
it worked! stabilized 4.9GHz finally under IBT Maximum mode when using vcore ofset of +0.245 at 25% LLC biggrin.gif
temps did hit 105C at one or two ocassions but normally stayed around 102-103C under full IBT load. no WHEA warnings and no thermal throttling occurred though biggrin.gif.
Edited by feniks - 10/1/12 at 9:57pm
post #6 of 6
Quote:
Originally Posted by prescotter View Post

The higher your LLC level, the lower the offset needs to for the same LOAD vcore.
But with a High LLC Level, the ''inbetween load states'' get lower voltage because of the lower offset.
I achieve best Offset Overclocks by using a Low LLC Level, and a High Offset.
So you dont get crashes on idle/medium load/gaming.
(With high llc i was stable but would get random crash once in a time on mild load)
So maybe try a low llc + high offset and maybe you get better temps in the end.

This is the best explanation of the relationship between offset mode and LLC I've seen to date. +REP.
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