My first overclocking attempt. But need help

[kelimna]

Hi guys

Im having a go at completing my first overclock on my rig. Im having a crack because of toms video on how to overcock the z77 platform. My question is it normal for OCCT to have cpu dips every 8 mins or so? leading up to this time CPU is pegged at 99.3-100% then dips and returnes. Im watching my voltage and not seeing any different numbers. Is this normal?

My rig specs are as follows.

CPU - 2500k
Voltage - 1.150v
Core clock - 42 multi
Cooler - Corsair H80 push/pull exhaust rear of case
Mobo - Asrock z77 extreme 4
Ram - geil Evo Corsa
Timing - 10-10-10-28 1600mhz 1.5v - in OCCT test set to 1333mhz
Command rate -1
GPU - HIS 7970 reference
Power supply - Seasonic 850w 80+ gold
Hdd - 256 ocz vertex 3 ssd + 2TB WD Green
OS - Win 7 Ultimate 64bit

When running OCCT im running the current settings

CPU - Linpack
Memory - 90%
Infinite loop
AVX Capable Linpack selected

every 8 mins or so i get a cpu dip to 30% and then it returnes to 100% again. no voltage movement.

Is this normal. Any help would be really welcomed. if required in can post images of bios and occt.

Cheers

Daniel

 

[tinytomlogan]

No mate if the cpu speed drops it needs more power. Or youve not followed the guide and its getting hot and the thermal monitor is kicking in.

 

[kelimna]

when watching temps on OCCT they are as follows

currently 45 mins into test

these are the max temps

CPUTIn max 53
Core #0 63 c
Core #1 68 c
Core #2 70 c
Core #3 67 c

All temps are in degrees

 

[kelimna]

im lost i have tried stock setting, thermal monitor off case open. dip still happens at 8-9 mins as test cycles down temps. im not getting any voltage drops in cpu-z all stable at 1.1v

 

[Master&Puppet]

Actually that's perfectly normal. Linpack works by cycling through tests and there is a slight pause between each test which shows up by a drop in temperatures and a sharp flick in CPU usage. Here's a copy of a quick run I did:

The length between the tests is dependent largely upon the amount of memory you use. I set 25% just then to get a quick result to show you.