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Last response: in Windows 7
December 27, 2010 8:59:25 PM

Hi All

I want to know the diffference between having Hyperthreading on and off on a Intel Core i3 M350 2.27GHz running windows 7...

I want to know whether if it is ON or OFF. All cases involve Word 2007 with a person typing at 79wpm, using web browser to browse Tom's Hardware-like websites.
-Better performance
-Make the laptop produce more heat or produce less heat (running the same apps in both cases)
-Make the laptop last longer
-Longer or shorter battery life

Thank you all for your information

More about : hyperthreading

a c 209 $ Windows 7
December 27, 2010 9:11:41 PM

To see if hyperthreading is ON or OFF run Task Manager (Ctrl+Shift+Esc) and click the "Performance" tab. If there are two CPU graphs then for a Core i3 it means HT is OFF. Four graphs means HT is ON.

For Word and web browsing you probably won't see any difference in performance, heat or battery life. Those types of programs are normally constrained by how fast the user can type or click links, and that's WAY slower than the CPU.

The only reason you might see a difference with hyperthreading is if the program has to use the CPU heavily. For example a web page with a 3D Flash object showing a continuously moving scene might perform better while doing other work with 4 threads instead of just 2.
December 27, 2010 9:26:43 PM

For the 3rd paragraph, with it on will it give more heat and less battery life or what?
Related resources
a b $ Windows 7
December 27, 2010 9:39:25 PM

You can't trust Task Manager all of the time.

Using sminlal's Core i3 example, what happens if you disable one core through the BIOS Setup but you leave HT enabled? Task Manager is going to show two graphs just like it would with both cores enabled and HT disabled.

Just run CPU-Z. It tells you how many cores and how many threads are enabled. A Thread-to-Core ratio of 2:1 would indicate that HT is enabled.
December 27, 2010 9:56:57 PM

I know

But I want to know, which will give better battery life and/or less heat: On, or Off
December 27, 2010 10:28:12 PM

Do you really have to ask this?!

Your computer will be doing less with it off...
work it out.
a b $ Windows 7
December 27, 2010 10:30:07 PM

the higher power consumption it will deplete the battery power faster. ..

Best solution

a b $ Windows 7
December 27, 2010 10:38:58 PM

With HT turned on it consumes more power which means more heat and shorter battery runtime.

I would say ~2% more power consumed at idle and ~10% more power consumed under full load with HT turned on.
December 27, 2010 11:03:19 PM

Best answer selected by edmond419.
December 27, 2010 11:03:40 PM

Thank you ko888. very helpful. That's the answer I'm looking for