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Turbo Mode Throttling

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March 12, 2010 6:12:39 PM

So I have my Core i7 920 overclocked to (4.0 GHz) on 1.256V. Clocked any higher and Turbo Mode seems to throttle down from 21x to 20x multiplier after some P95 stress testing. I've tried upping the Vcore and VQPI with no luck. It seems the throttling is based one core temp. If my cores exceed and sustain 68-70 C (or higher) it seems to drop down to 20x.

Has anyone one else faced this issue? Is temp the culprit or do you think there are other voltage settings that may be saturating and causing the throttle?

More about : turbo mode throttling

a b K Overclocking
March 12, 2010 6:15:50 PM

turn off turbo mode, problem gone :) 
March 12, 2010 6:19:20 PM

In the future go ahead and assume I wouldn't have posted if that was all I was interested in. Got anything more substantial/helpful to add?
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a b K Overclocking
March 12, 2010 6:24:51 PM

so why you adding insult to injury yo, you have the thing overclocked to 4.0, you really think that turbo mode is going to be beneficial at this point?
March 12, 2010 6:28:23 PM

Not trying to insult, just I thought turning it off is obviously not what I wanted.

It's only at 4.0 GHz when it's ratio is 21x. I'd like that extra kick if needed, but not all the time (waste of power). Ideas?
a b K Overclocking
March 12, 2010 6:38:38 PM

in my opinion, anything past 4.0 on that CPU would show very minimal gains and only risk damage or reducing the life of that CPU.

If it were me and i could hit 4.0 with no problems, i would try to see if speedstep worked with that overclock, and disable turbo-boost. This way, you won't have to worry about the prospect of harming the CPU and when idle, it'll throttle down to save energy and the life-cycle of the CPU...

Though if anyone else reads this, would you agree that anything over 4.0 on a 920 is overkill and not worth the risk?
March 12, 2010 6:46:26 PM

OK. I really appreciate your input. I will consider that.

I'd like to hear what others have to say too because it's my understanding running at VCore 1.264V with max temps of 68 C is well within Intel's spec for this processor:
Quote:
Thermal Specification: 67.9°C (measured at the heat spreader, not the core)
VID Voltage Range: .80V-1.375V
a b K Overclocking
March 12, 2010 6:54:45 PM

Indeed, i know what you mean, but here's a similar situation, my Q6600 is @ 1.39 VCORE and running 3.6 fine, temps peak @ 65*cel average 55*cel and idle @ 34*cel, now when i up the voltage to 1.41 & bring it to 3.8, temps fly to 75*cel, average 63*cel & idle @ 50* cel

So, again, to me, it is not worth the small gain that i get (maybe 1-3% performance) going from 3.6 to 3.8

If you really want to test it and see if it'll be harmful, turn off turbo and OC it to 4.3, see what the temps hit.

My guess here is that @ the voltage you have set, turbo is attempting to boost but not liking the voltage or heat and thus throttling down...
March 12, 2010 7:20:58 PM

Yea I know what you mean. But even when I was at 4.2 GHz with temps around 72-74 C it's throttling to 20x (20x 200 MHz = 4.00 GHz, which is about the same as 21x 190 = 3.99 GHz) The second one (4.0 GHz w/Turbo) uses less Vcore and thus temperature. So I figure it's smarter (more efficient) to run 21x 190 than 20x 200.
!