2500k Turbo Throttling HELP!

Scythe · 21 Oct 2011 at 00:07

Hi, I've had my 2500k running at 4GHz at 1.184V (-0.115 offset) on a Asus P8P67 LE for about a month now, and I want to step up to 4.5GHz.

I proceeded by upping my turbo ratio to 45, and running an -0.2V offset. It's running fine at about 1.3V, however when stress testing, it keeps running at 4.5GHz for a bit, then drops to 3.3GHz, and it does this every 20-30 secs!

Can anyone help? I've updated to the new BIOS with no joy.

Jakus · 21 Oct 2011 at 00:29

Somewhere in the bios You will see some power settings, You may have a short and Long Max power limits.....Just increase the relevant a little

and test

weird_dave · 21 Oct 2011 at 00:34

There are a number of things that can cause this, I suffered it too!
Generally (as I'm not familiar with your exact mobo) there are BIOS settings for current and power consumption, when either of these are exceeded it will throttle back. They will need to be increased. 200-300 will do, it's not critical to the overclock.
You'll also need to disable temperature throttling. (this one first!).

Jakus · 21 Oct 2011 at 00:52

It's a 95W TDP, Maybe 120-130W or so, short burst, You do not want 200-300 and never turn off the overtemp throttling safety !
If You can't keep it under 60c You should not be overclocking it

Scythe · 21 Oct 2011 at 08:13

JAKUS said:
It's a 95W TDP, Maybe 120-130W or so, short burst, You do not want 200-300 and never turn off the overtemp throttling safety !
If You can't keep it under 60c You should not be overclocking it

Is this it?

Uploaded with ImageShack.us

At 4.5ghz it was hitting 54-58C on prime, at 4.0 it runs about 48-50 on prime across the cores.

Jakus · 21 Oct 2011 at 12:58

Yes, that's What You need to increase to stop the automatic down clock, Just play with the settings and run Cpuz, realtemp and prime.

The short duration limit may be more tied to "turbo type" overclocking and the Long more to a fixed type overclock.

You were bright enough to pick up it was down clocking, I'm Sure You will soon work out the best method of overclocking for Your requirements

Speed · 21 Oct 2011 at 13:03

JAKUS said:
It's a 95W TDP, Maybe 120-130W or so, short burst, You do not want 200-300 and never turn off the overtemp throttling safety !
If You can't keep it under 60c You should not be overclocking it

Over 60c is fine. :confused:

weird_dave · 21 Oct 2011 at 17:34

The thermal trip will kick in if it gets too hot

I set the power limit high so I never suffer throttling

If you can't get the temperature over 60, you're not doing it right!!

(or on water/exotics)

pgi947 · 21 Oct 2011 at 17:44

Plus if you have the asus AI suite installed that came with the motherboard it will alert you when you hit its default alarm limit which is 90c, you can custom set the alarm limit to what ever temp you like, the sandys will hit 98c before they throttle back/shut down.