R
Ron Reaugh
Some small format/ultracompact laptops suffer from a major performance
deficiency that is being hidden by laptop manufacturers.
Intel CPUs come with built in thermal sensing and self throttle when too
hot. Some small format laptops simply can not EVER run at full rated CPU
speed for more than short bursts in a room at normal temperature, 20C.
Their design includes insufficient thermal dissipation for continuous
saturated CPU usage. Such continuous CPU usage is seen in backups using
data compression and many other types of CPU intensive processing like voice
recognition, some games, some video processing and Matlab. A Toshiba 3500
TabletPC I've been studying can at best run continuously at about 600
MHz(spec is 1.33GHz Pentium M) in a 25C room. A Sony X505 contains a very
obfuscated disclaimer regarding CPU speed in its spec sheet on its website
which is this issue. Similar obfuscated disclaimers about CPU speed do
appear in both the 3500 and M200 spec sheets at Toshiba's website.
This is not a battery saving issue where CPU throttling is a designed in
positive advertised feature/advanatge. This is all about when the laptop is
AC powered and one ASSUMES that the laptop provides full performance. It
does NOT!
One can see this behavior using a program like MobileMeter which will show
the CPU temperature jumping to a maximum like 88C and then the CPU speed
plummets.
http://dssc3031.ece.cmu.edu/~tamaru/mobilemeter/mobilemeterreadme-e.htm
download:
http://www.geocities.co.jp/SiliconValley-Oakland/8259/release/0310/mm0310.zip
Large format laptops like the Sony K27 and Gateway M505 have sufficient
cooling and will run at full rated CPU speed continuously.
Is anyone aware of this issue and how widely spread this is?
deficiency that is being hidden by laptop manufacturers.
Intel CPUs come with built in thermal sensing and self throttle when too
hot. Some small format laptops simply can not EVER run at full rated CPU
speed for more than short bursts in a room at normal temperature, 20C.
Their design includes insufficient thermal dissipation for continuous
saturated CPU usage. Such continuous CPU usage is seen in backups using
data compression and many other types of CPU intensive processing like voice
recognition, some games, some video processing and Matlab. A Toshiba 3500
TabletPC I've been studying can at best run continuously at about 600
MHz(spec is 1.33GHz Pentium M) in a 25C room. A Sony X505 contains a very
obfuscated disclaimer regarding CPU speed in its spec sheet on its website
which is this issue. Similar obfuscated disclaimers about CPU speed do
appear in both the 3500 and M200 spec sheets at Toshiba's website.
This is not a battery saving issue where CPU throttling is a designed in
positive advertised feature/advanatge. This is all about when the laptop is
AC powered and one ASSUMES that the laptop provides full performance. It
does NOT!
One can see this behavior using a program like MobileMeter which will show
the CPU temperature jumping to a maximum like 88C and then the CPU speed
plummets.
http://dssc3031.ece.cmu.edu/~tamaru/mobilemeter/mobilemeterreadme-e.htm
download:
http://www.geocities.co.jp/SiliconValley-Oakland/8259/release/0310/mm0310.zip
Large format laptops like the Sony K27 and Gateway M505 have sufficient
cooling and will run at full rated CPU speed continuously.
Is anyone aware of this issue and how widely spread this is?