LLC

currob

currob

currob

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Joined
15 Nov 2011
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901
Location
Stafford
Hi 8 pack, i have spent the last week reading everything i can find regarding CPU LLC and have the following understanding of it but would like to ask you if i have got it right or wrong as i do find it helps a lot with my oc:

Measure vdroop with LLC off, for this example it is 0.020v and the vcore is manually set at 1.450v in BIOS.

With LLC off max vcore will be 1.450v and vdroop to 1.430v
With LLC at 25% (low) max vcore will spike to 1.455v and vdroop to 1.435v
With LLC at 50% (med) max vcore will spike to 1.460v and vdroop to 1.440v
With LLC at 75% (high) max vcore will spike to 1.465v and vdroop to 1.445v
With LLC at 100% (xtreme) max vcore will spike to 1.470v and vdroop to 1.450v

If i have understood what i have read correctly then i assume that providing temps are fine and the max vcore does not exceed a level i would not be happy with for 24/7 then the LLC setting can safely be whatever i want it to be? Or is there more to it than my level of understanding?

Many thanks in advance :)
 
In my experience it works slightly differently. At higher LLC settings (extreme etc) you tend to find the voltage increases under load rather than drooping, so the vdroop and spike voltages you have listed become one and the same to an extent. I usually go for a setting that gets me closest to the voltage I set so it's more predictable, but if my board is a bit flakey a higher setting can help.

I don't know if that's the most effective way to do it though, so hopefully 8pack will give you a better answer.
 
Intel and AMD design means that voltage is actually meant to droop under load. This inherently protects the CPU from damage at heavy load.

My personal view is I dont hammer LLC on my own 24/7 builds or even on xtreme cold. I stay roughly within how the manufacturer wants the CPU to be powered in terms of Vdroop curve.On X79 I never go above medium LLC for 24/7 use and with Z77 never above high. I see your using an Asus board and usually its named not in percentages but reg,med,high,ultra high and xtreme. Xtreme gives more voltage at load than set, ultra high about the same and so on down.

With LLC its your choice but I keep its use to a minimum to protect the hardware from voltage spikes.
 
Thanks, i've read so many differing opinions on different sites, i reduced my cpu llc a few days back after asking on this forum in a previous thread. I'll leave it alone and try to get back up to 4.7GHz with the vcore (down to 4.5GHz now with reduced setting on llc). I believe that 1.500v is the max recommended if temps are ok, it's at 1.450v atm :)
 
Sorry to fire more q's at you.. I can get 4.5GHz stable at 1.450v (220x20.5) but if i go to 220x21.0 it is unstable even if i go up to 1.500v. If I try 225x20.5 it is also unstable at 1.500v. I must be missing something..

CPU/NB 1.2v
DRAM 1.5v
LLC high
CPU/NB LLC high
CPU overcurrent 130%
CPU/NB overcurrent 120%
CPU voltage frequency auto - spread spectrum off
CPU VRM Phase extreme
EPU Mode High Performance
CPU PWM Mode T.Probe
NB 2200MHz
RAM 2060MHz

Any suggestions :)
 
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