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Bios settings. What do they mean?

post #1 of 8
Thread Starter 
I'm overclocking my new rig, but I've got questions regarding what different bios settings do, that google couldn't answer.

I read the Ivy bridge Asus guide, but the creator doesn't explain all the settings.
I'm running a 3570K on a P8Z77-V LK with Hyper 212 evo.
Would like a 4.5 (or even better 4.6) overclock.
I'm stable (at least 8 hours pf P95 27.7) at 4.4 with 1.25V and max temp of 83C, but generally at 70C during P95.

Now for the questions. Sorry if they're obvious.

Internal PLL Overvoltage: What does it do (other than mess with sleep)?

CPU PLL Voltage: After googling this, I am no closer to understanding when I should change it instead of Vcore.

CPU LLC: Ok, if I understand this correctly (which I'm sure I don't), this makes it so that the voltage never goes below the Vcore I set in the bios. Thus when going from idle (1600MHz) to load (4400+MHz), it should prevent my voltage from going under 1.25 (or wathever I manually/offset set in the bios), and thus prevent an error or crash due to insufficient Voltage getting to the CPU. The negative side of things being that it can overshoot and give me more voltage (like 1.3 for instance), which raises temp and deterioriates the CPU a tad bit faster. Is that it? Why do people recommend setting it at Ultra High instead of High or medium?

CPU Fixed Frequency: Google was of no help. What is this?

CPU Power Phase Control: Once more, I realize I know nothing. A guide here says to set it at Extreme rather than manual (which offers regular to ultra fast settings)?

CPU Power Duty Control: I shouldn't need to use the Extreme (current balance) with sub 4.7 overclocks I assume.

CPU Current Capability: What does this do?

I know it's a lot of questions, but I'd be mighty grateful for any info.
Thanks!
post #2 of 8
if I understand this correctly (which I'm sure I don't) thumb.gif
Most of the questions are related to CPU capabilities and to understand this you have to steady Intel documentation about your CPU. For that you will need a basic electronic knowledge. If you don't have this just do as manual say's: " Go from this value up to this value and observe performance, voltages and temperatures. For anything better than that you will spend couple of months steadying, searching and testing biggrin.gif
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post #3 of 8
Check out the asrock guide http://www.overclock.net/t/1198504/complete-overclocking-guide-sandy-bridge-ivy-bridge-asrock-edition Your board might be different but the definitions are the same.
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post #5 of 8
Thread Starter 
Can't get my OC stable (prime95 error on core4 after a few hours).

Last stable configuration:
Multiplier 44 with 1.24V.

Current settings:
Multiplier 45
BCLK 100
CPU Voltage: 1.27 (actual values under full load: 1.28)
Temps: Under full load: Around 65-70. Max: 87

VCCSA / CPU PLL / PCH all stock: 0.925 / 1.8 / 1.05
CPU LLC: Ultra High
CPU Current Capability: 120% (Max)
CPU Voltage Frequency: 350Khz (Default was 250Khz)
CPU Power Phase Control: Extreme
CPU Power Duty Control: T.Probe
C States all Deactivated

Ram: Stock values (9-9-9-24-2, 1600Mhz, 1.5V)

Any clue what could make it more stable?
post #6 of 8
You may need something like 1.3 or more volts for 4.5GHZ. If it is going to 1.28V under load it means the Overvoltage / LLC is kicking in to keep it stable.

In a feedback loop system (i.e. the system adjusts based on load to try to match the value you set), there is overshoot, that's what's happening with Extreme setting on most motherboards' LLC. The overvoltage allows you to have more overshoot but then it compensates for load so at idle you could have instability (due to the perceived lower required stable voltage).

See the graph on http://en.wikipedia.org/wiki/Step_response and http://en.wikipedia.org/wiki/PI_controller#Droop , http://en.wikipedia.org/wiki/PID_controller#Droop

It could be a motherboard limitation as well, the VRM on the P8Z77-V LK isn't that strong (not that many phases) so the overclocks you get aren't going to be that high.

CPU fixed frequency means it has a set value , say 4.5GHz, instead of a dynamic one (i.e. Turbo boost to 3.7GHz and speedstep which downclocks to 1.6GHz).
Edited by AlphaC - 12/12/12 at 9:28am
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post #7 of 8
Thread Starter 
Thanks for the info.
I tried 1.29V and no help. Still get an error on the same core, at about the same elapsed time.

Starting to think I'm gonna reach the thermal threshold before I can get a stable Voltage to support 4.5Ghz.

It just seems like I'm either doing something wrong, or I got a poor chip cause 1.3V for 4.5Ghz seems like a lot of voltage for such an average overclock.
post #8 of 8
You can keep trying higher voltages just to see if you get it stable (try 1.32 or something) but the chips do kind of hit a wall where it takes a lot more voltage for smaller and smaller gains, and you might be there. If you can do 4.4 stably at 1.25V or something, and it takes 1.3V for 4.5, then you're at that point. Normally it's best to just stay on the happy side of that wall, otherwise you are adding a lot of stress to the CPU for very little performance gain.

Have you tried enabling CPU PLL Overvoltage? I don't think it'll make a difference in your case, but worth a shot.
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