2500k overclocking fail

[jaws104]

Hi

Been a while since dabbled with overclocking but just fitted a Noctua D14 and thought i'd see if i could get stable 4.5 or 4.6. But no where near. At 4.3 the pc just shuts down after around 20 minutes prime 95. No bsod, just shuts down.

4.3 (42x103)
using 1.36v according to core temp
or 1.408v according to cpu-z ??

Highest temp at any stage was 64deg on core 4. Which does not seem that high...

This is via Asus 'performance' template in bios... didn't enter the values manually. Board is an Asus P8Z68-V

Where do i go from here?

 

[Doomedspeed]

Where do i go from here?

Here: http://forums.overclockers.co.uk/showthread.php?t=18488175

Always use CPU-Z voltage reading. 1.408 is very high, is that under load or idle?

I would use manual input to make sure you get the overclock stable.

This may help, found it on this website: http://forums.whirlpool.net.au/archive/1814716

AI overclock tuner Manual
BLCK 100.0
Freq 45.0
Pll overvoltage – Auto
mem freq – 1600

Load Line Calibration – Medium
VRM frequency – Auto
Phase control – Extreme
Duty control – Tprobe
Cpu current cap – 100%

Cpu Voltage 1.112v – Offset Mode
offset Mode sign – "-"
dram voltage 1.521v – 1.500

Everything after that on – Auto

Cpu power management=

Speedstep enabled
Turbo Enabled

You need to get the voltage lower though.. Don't mess a lot with the BLCK either, keep it at 100.

 

[jaws104]

Thats under load.

Thanks that looks very helpful. I got stuck though. Not sure how that offset voltage works. Usable values seem a lot lower in the right column on screenshot

EDIT:: Also noticed according to bios the cpu is reading 40deg which seems odd. Idle in Windows is 29deg in core temp and speedfan

EDIT 2 :: Ok tried tweaking it a bit and now have better temps/lower voltage and stable so far. Still not sure about how offset works though, do you have to set your cpu voltage to manual in bios, enter the voltage you want and then change it to offset from there??

Also the speed is stuck at 4300 even when not under load, although the voltage does drop. Is that working as intended? Pics

 

[jaws104]

Ok sry for double post but edits were getting ridiculous

Now Priming @4.6 and is ok so far, will leave it go overnight. But as you see below it has auto bumped the volts to 1.408 under load. Ambient temp is lower now so probably why its holding at 60deg

Ideally would like to get 4600mhz under 1.4volts and under 60deg. But still can't figure out how the voltage offset works. It's set to negative, if i change the cpu offset voltage from auto to 0.005 it will not even boot into windows. Confusing.

It decided on 1.36v @4500mhz which seems comfortable both temp and volt wise, will maybe have to settle for that if can't figure out how these volts work

 

[Doomedspeed]

1.4 volts is really too high.

That bump in voltage will be the LLC working.

Take this as a guidline..

My 2500k.

4.5 @1.3v stable, medium LLC.

4.6 @ 1.32v stable, medium LLC.

4.7 @ 1.35 stable, high LLC.

 

[jaws104]

In the end didn't see point running prime at 1.408v all night as i wouldn't use that high voltage day to day. Instead ran 8hrs prime 4.5@ 1.36v. Highest temp 62

Will change cpu volts to manual instead of offset tonight and try values similar to above.

Also concious of the fact my pc is probably running a bit cooler than normal as it's got no graphics card in at the mo.

EDIT:: Ok did a few quick tests at lunch today... there looks like quite a bit of vdrop under load doing this manually. Set to 1.3v @4300mhz it drops to 1.24v under load with medium LLC. Bumped it up to ultra (4) LLC and it's sat at 1.288. Should i stick it up to the max LLC and work from there? any problems with running max LLC??

EDIT 2 :: Right Priming 4.6 @ 1.336. That's 1.345 in bios. Crashed after 15 min with lower voltage. Temps are 62/63. If this is not stable will drop down to 4.5 and call it a day.