PDA

View Full Version : Strange: 2 identical notebooks, different GHz processor speed



hotkiwi
01-09-2006, 08:11 PM
Friends,
I have this strange experience: I bought for my 2 daughters 2 identical notebooks: Compaq Presario M2000. They came with only 256 MB RAM, so installed in both of them another 512 MB today.
I looked under control panel > system properties > general and found two different processor speeds:
one reads:
HP
Mobile AMD Sempron (tm)
Processor 3000+
789 MHz, 640 MB of RAM
Physical Address Extension

and the other:
HP
Mobile AMD Sempron (tm)
Processor 3000+
1.79 GHz, 640 MB of RAM
Physical Address Extension

Why this difference???
Is 640 MB RAM what you would expect?

Cheers

Johan

Speedy Gonzales
01-09-2006, 08:22 PM
The 640 would be using 128mb for the onboard video.

256+512-128=640

Dont know why the speed would be different if theyre the same notebook.

robsonde
01-09-2006, 08:24 PM
i would put my $$ on the fact that one was on main power and the other was running on battery.

most laptops slow the CPU down a lot when not on main power.

Metla
01-09-2006, 08:34 PM
Laptops also (usually) reduce the clockspeed to match the task at hand so they very rarely run at full snot.

And the lower the battery charge the more Power Saving features take over, turning off devices, throtteling down the cpu speed (even when you are asking it to go hard) reducing the screen brightness....

hotkiwi
01-09-2006, 08:40 PM
You guys are genious. One was running on battery, the other on AC/DC.
Thanks a lot!!
Never knew the processor reduces its throttle by 50%.

Johan

Pete O'Neil
01-09-2006, 08:51 PM
Unless your daughters are doing something resource intensive you could probably get away with reducing the ammount of system ram that is assigned to the video chipset.

developer
01-09-2006, 09:32 PM
You can enable / disable the automatic speed adjustment.