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View Full Version : Is 798.3 Mhz Clock Speed Normal for G74sx



weaksauce
11-10-2011, 11:26 PM
When idle, my clock speed in CPU-Z reads 798.3 Mhz. Is this normal? I thought Turbo boost was supposed to go from 2 Ghz to 2.8 Ghz?

4161

fostert
11-10-2011, 11:35 PM
This is perfectly normal: when the cpu isn't being taxed and is "idle" the EIST technology in the intel chips downclocks them to ~800 MHz. The moment you run something that uses one or more cores that will OC to somewhere between 2.3 and 2.7 GHz. I have never seen my G74 reach its full potential of 2.8-2.9 GHz in windows even when running prime 95 on a single core (reviews of the G74 also see this problem; see http://www.notebookcheck.net/Review-Asus-G74SX-3DE-Gaming-Notebook.56809.0.html) but my cpu freq. goes to 2.925 GHz under linux quite readily.

weaksauce
11-11-2011, 12:03 AM
thanks for the quick reply. much appreciated.

380mcn
11-11-2011, 11:59 AM
This is perfectly normal: when the cpu isn't being taxed and is "idle" the EIST technology in the intel chips downclocks them to ~800 MHz. The moment you run something that uses one or more cores that will OC to somewhere between 2.3 and 2.7 GHz. I have never seen my G74 reach its full potential of 2.8-2.9 GHz in windows even when running prime 95 on a single core (reviews of the G74 also see this problem; see http://www.notebookcheck.net/Review-Asus-G74SX-3DE-Gaming-Notebook.56809.0.html) but my cpu freq. goes to 2.925 GHz under linux quite readily.

so, it's a "windows feature" not passing the 2.7barrier..

JRd1st
11-11-2011, 12:05 PM
Actually, its an Intel feature, I think. Most people would like their notebooks to use lless power when idling. Anyway, don't you wanna be "green"? Lol

Yahooligan
11-11-2011, 04:28 PM
Actually, its an Intel feature, I think. Most people would like their notebooks to use lless power when idling. Anyway, don't you wanna be "green"? Lol

Not sure how it would be an Intel thing limiting Windows to 2.7GHz while Linux gets the full boost? The CPU doesn't know or care what OS is running. :)

JRd1st
11-11-2011, 04:30 PM
Because Intel made Turbo Boost. Isn't turbo boost what does the boosting?

fostert
11-11-2011, 05:05 PM
Turbo Boost is based on ACPI, which is either implemented in hardware (i.e. BIOS) or software (i.e. OS). Since the G74Sx unfortunately does not implement this standard in BIOS, TB relies on software ACPI. Perhaps the Windows implementation is different than that in the latest Linux kernels: I had to upgrade to the 3.0 kernels to get the full 2.925 GHz in Linux, because the old stable 2.6.32 kernel did not even allow the CPU to clock beyond 2.0 GHz!