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overclocking turbo boost on an i5 2500K / P8P67 LE board. Having some issues

post #1 of 19
Thread Starter 
Hey! first post around here and I was wondering if you guys maybe could provide some help!

basically im overclocking the turbo boost feature on my i5 since the LE version of this board wont let me have it any other way.

Im basically just turning the AI tweaker to manual, putting the multiplier values per core, turning off c-states and other power saving stuff and nothing else. I cant manually set the Vcore, but I found that at about X43 the voltage stays at acceptable levels.

Now, here's the thing: I started running a longer prime95 blend test, and after a while this happened:

temps:



speed:



power:




It doesnt stick. It seems that all of the sudden it decides to get hotter, surpasses 70-73°C and this makes the whole thing automatically wind down back to no-turbo-boost mode.

It also seems that it keeps trying to get back up again but to no avail, creating those up and downs in the graph.

This was running at 4.3ghz. Im currently running the same test at 4.0ghz and it doesnt seem to go much above 70°C after about 20 mins of testing, and this issue hasnt shown up. That said, I was planning on pulling 4.3ghz-4.5ghz, so this is disappointing.

Why could this be happening? is it normal for an i5 to wind down this much just above 70°C? any way around it?

im using a hyper 212 EVO btw. Seems to be doing it's job.

help frown.gif
post #2 of 19
Thread Starter 
turned off Intel Adaptive Thermal Monitor, wich apparently was ON in BIOS. Figured that was it but..



now the drops are random and dont seem to be related to going over 70°C

running out of ideas frown.gif
post #3 of 19
Thread Starter 
no ideas?
post #4 of 19
It might also be power throttling. A lot of the boards let you increase the CPU power limit (it has different names in the BIOS), if your board doesn't let you, or you didn't change it, then when a particularly stressful Prime95 tests starts it could be exceeding the current limit and throttling the chip. Does it do it on any other tests, like IntelBurnTest? Does it do it on lighter loads, like Heaven or gaming?
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post #5 of 19
Thread Starter 
what name could that option have on my board's BIOS?

im gonna try to run it through heaven. I was also wondering about how reliable where the blend tests in the sense that if you'll ever be stressing your CPU that much while outside of a specfic stress test, just gaming and whatnot.

I also changed the power chord just in case it's voltage related
post #6 of 19
Normally it has power limit or current limit in the name - pretty sure it was something like CPU Current Limit on my P8P67 Pro board - normally it is expressed as a percentage (so set it to 120% for example).

And nothing in normal use is going to stress the CPU like Prime95 does.
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post #7 of 19
Thread Starter 
changed a couple settings (set the power saving mode to high performance, activated intel speedstep to set a limit to the turbo boost long duration/short duration power limits (200/230), some other stuff)

new blend test:



(used temperatures just to show, but it winds down in every single aspect)

same thing. And from them on it just keeps constantly winding up and down like that (easily audible) till I stop the test. Vcore seems to be at 1.344V according to CPU-Z and at about less than 1.28V when stressed. It only fluctuates a bit.

gonna try IntelBurnTest but im already bummed knowing that you're supposed to steadily run a blend test for 12 hours or so and I get this happening after 20 minutes :/

it's literally as if the turbo boost just decided to stop. Everything drops: temperature, speed, power consumption. It just gives up and tries to get back up but cant.
post #8 of 19
Did you try changing Primary Plane Current Limit?
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post #9 of 19
Thread Starter 
Quote:
Originally Posted by Forceman View Post

Did you try changing Primary Plane Current Limit?

it's at AUTO. What value should I use?
post #10 of 19
Quote:
Originally Posted by Salsa View Post

it's at AUTO. What value should I use?

Not sure what the options are - just try maxing it out to see if it makes a difference. You can always tweak it back down later.
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Hard DriveHard DriveCoolingMonitor
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