(03-26-2012, 04:37 AM)AnyOldName3 Wrote: [ -> ]Don't count turbo boost as an overclock: it will hit the maximum for about 45 seconds, and then will drop significantly lower. I am not an expert, so you will have to google the speed you can expect to sustain for turbo boost, and how long exactly (it may be significantly more or less than 45s) it can hold the maximum turbo boost.
I've never heard of a time limit on Turbo Boost, where did you find that info? Tried googling, but no luck.
(03-26-2012, 04:50 AM)DefenderX Wrote: [ -> ]thanks for link, Shonumi.
my notice: When i start a game with Dolphin, the Turbo Boost speeds up my CPU to 2.9 GHz. 3-5 seconds later, the CPU stays constantly @ 2.8 GHz. But the Turbo Boost don't want to go over 2.8 GHz in Dual-Core mode. Even when the temperatures are raising to a very high level (like 90 degrees).
btw: same with Prime95
According to Wikipedia, "the increased clock rate is limited by the processor's power, current and thermal limits". I remember how insanely high you said your CPU got a while ago, almost hot enough to boil water.
It could be that if it did go to 3.1GHz, it'd be too much to handle.
yeah, and furthermore, every CPU is different.
the same as when you want to overclock an Intel Core i5-2500k - Some are better, some are worse. Some need more Vcore, some need less...
Quote:I've never heard of a time limit on Turbo Boost, where did you find that info? Tried googling, but no luck.
It doesn't. You can look up the documentation for turbo boost on intels website and it does not mention any time limits anywhere.
Turbo boost is limited by:
-# of active cores (only in turbo boost 1.0, nehalem chips)
-gpu activity (only in turbo boost 2.0, and only if the IGP is enabled)
-temperature
-power consumption
-clock rate limit
-core load (it will not overclock if the core load is not at 100%, because that would just be wasting power)
Also keep in mind that the cores do often run at different clock rates while turbo boost is active.
(03-26-2012, 05:34 AM)NaturalViolence Wrote: [ -> ]Quote:I've never heard of a time limit on Turbo Boost, where did you find that info? Tried googling, but no luck.
It doesn't. You can look up the documentation for turbo boost on intels website and it does not mention any time limits anywhere.
There are no time limits. It's just after a certain amount of time most CPUs cannot sustain the high clock rate without overheating. That could be interpreted as a time limit by someone, looking at the clock speed increase, then quickly decrease as the CPU overheats.
It isn't a time limit, it just gets too hot and draws too much power to sustain that speed, so brings it back down after a while, even if the same amount of work is being asked of it. That's why it's only a part time thing, not an overclock, and intel will sell something as a 3GHz with turbo boost to 3.3GHz processor, not a 3.3GHz processor. I can't exactly cite my sources, but what I wrote was a poorly worded mash up of things in other threads.
(03-26-2012, 04:50 AM)DefenderX Wrote: [ -> ]thanks for link, Shonumi.
my notice: When i start a game with Dolphin, the Turbo Boost speeds up my CPU to 2.9 GHz. 3-5 seconds later, the CPU stays constantly @ 2.8 GHz. But the Turbo Boost don't want to go over 2.8 GHz in Dual-Core mode. Even when the temperatures are raising to a very high level (like 90 degrees).
btw: same with Prime95
I've seen admin write stuff like
1 core 3.1Ghz
2 core 2.8Ghz
4 core 2.5Ghz
Dont know if the same applies here, try disabling dual core and checking
With dual core disabled: between 3.1 and 2.8GHz
Strange is: Most time, speed stays @ 2.8 GHz. Sometimes, it raises up to 3.1 GHz.
(03-26-2012, 05:34 AM)NaturalViolence Wrote: [ -> ]It doesn't. You can look up the documentation for turbo boost on intels website and it does not mention any time limits anywhere.
I thought so, thanks for confirming that. I looked around everywhere, but I only found one mention of a time limit on some other forum.
(03-26-2012, 05:44 AM)AnyOldName3 Wrote: [ -> ]It isn't a time limit, it just gets too hot and draws too much power to sustain that speed, so brings it back down after a while, even if the same amount of work is being asked of it. That's why it's only a part time thing, not an overclock, and intel will sell something as a 3GHz with turbo boost to 3.3GHz processor, not a 3.3GHz processor. I can't exactly cite my sources, but what I wrote was a poorly worded mash up of things in other threads.
Yeah, Turbo Boost isn't meant to run at the maximum all the time. Still, I doubt the i7-2670QM would scale back its Turbo Boost all the way to the stock 2GHz to keep everything in check. I imagine it could maintain some level of Turbo Boost for a while.
DefenderX, since you have the same CPU, how long can you play Dolphin and notice that Turbo Boost is still working? EDIT: nvm, you ninja'd the answer!
many hours.
although the temperatures are sometimes critical, my CPU don't throttle the speed.
Turbo boost can be run at its max speed permanently so long as you satisfy all of the conditions that I listed earlier.