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help me understand these temp fluctuations

post #1 of 4
Thread Starter 
EVGA Dark x79 motherboard
4930K cpu
32 gig Kingston ram at 2133 mhz

windows 7 pro
overclocked to 4.4 ghz stable on IBT for 1 hour at 1.28v vcore, all features enabled (hyperthreading, vtD, C!EIST,etc)

temps2.JPG 77k .JPG file

This graph shows the temps in three situations
1) Intel Burn Test running and
The corsair H110 with its own fans in push and a pair of noctua NF-A14-PWM in pull with the voltage reduction resistor

Intel Burn test off

2) Intel Burn Test running and
The corsair H110 with its own fans in push and a pair of noctua NF-A14-PWM in place but not plugged in.
The idea here is to create a little extra resistance for the corsairs to push against

Intel Burn test off

3) Intel Burn Test running and
The corsair H110 with its own fans in push ONLY

I cannot understand the temp fluctuation. Initially I thought my cpu was throttling so I ran throttle monitor while doing a maximum intel burn test and the corsirs only and this is the resulting graph.

temps.JPG 87k .JPG file

There was no throttling visible on throttle monitor but I still see this weird temp fluctuation.
Anyone seen stuff like this before?
post #2 of 4
Are you talking about the fluctuations when the temp drops/rises but the CPU stays loaded at 100%? If so, that's pretty standard in my experience...even though the cpu is at 100%, different instruction sets tested during the IBT run are more stressful than others. So the cpu will heat up and cool down.

I have an H110 too, and it's pretty quick to react to load changes...meaning when the load drops (or a less intense instruction set is running), it will cool down pretty quickly.

The AIDA stability test is a little more constant...temps stay pretty well within a 3-5° range. Try it and see if you still see the "strange" temp fluctuations.
post #3 of 4
Thread Starter 
AIDA doesnt get my cpu nearly as hot - 50 deg max - but yes temps are steady.
post #4 of 4
Rule of thumb when setting up your radiator in Push/Pull.

1) You always want identical fans
2) If you cant have identical fans they need to at least be identical static pressure
3) If you do not follow rule 1 or 2 you will typically have some crazy results from your temps, such as fluctuating.

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