Dual core processor not showing up correctly in task manager on WinXP

[denveritguy780]

I built a machine with a Gigabyte GA-MA770-DS3 motherboard and a dual
core Opteron processor. When I run task manager (Win 2003 server) on
my servers I see a separate CPU graph for each core (4 total for 2 x
dual core processors). On the machine running XP with the Opteron I
only see the one CPU graph. Is this correct or is the OS somehow not
utilizing the dual core feature?

 

[JS]

Download CPUID (CPU-Z).
http://www.cpuid.com/

 

[SC Tom]

I built a machine with a Gigabyte GA-MA770-DS3 motherboard and a dual
core Opteron processor. When I run task manager (Win 2003 server) on
my servers I see a separate CPU graph for each core (4 total for 2 x
dual core processors). On the machine running XP with the Opteron I
only see the one CPU graph. Is this correct or is the OS somehow not
utilizing the dual core feature?

Look under View, CPU History, and check One Graph per CPU and see what you
get.

SC Tom

 

[Paul]

Look under View, CPU History, and check One Graph per CPU and see what you
get.

SC Tom

Another thing you can check...

Depending on when the OS was installed (i.e. when a previous
single core processor was present), it could be the HAL which
is wrong. In Device Manager, check under the "Computer" entry.
My dual core processor reports "ACPI Multiprocessor PC" and
I get two graphs in Task Manager. If it says "Uniprocessor",
that could account for the missing core. Changing Uniprocessor
to Multiprocessor is relatively easy - not all HAL changes are
as easy, so if the install is really screwed up, it might
be more difficult to correct.

Also, depending on the vintage of the motherboard, there
is a BIOS setting that can mess this up as well. Something
like "MPS version", with choices 1.1 and 1.4. Newer boards
shouldn't have a problem with that, but some older boards
appear to have screwed up the implementation.

Paul

 

[JohnO]

Another thing you can check...

Depending on when the OS was installed (i.e. when a previous
single core processor was present), it could be the HAL which
is wrong. In Device Manager, check under the "Computer" entry.
My dual core processor reports "ACPI Multiprocessor PC" and
I get two graphs in Task Manager. If it says "Uniprocessor",
that could account for the missing core. Changing Uniprocessor
to Multiprocessor is relatively easy - not all HAL changes are
as easy, so if the install is really screwed up, it might
be more difficult to correct.

Also, depending on the vintage of the motherboard, there
is a BIOS setting that can mess this up as well. Something
like "MPS version", with choices 1.1 and 1.4. Newer boards
shouldn't have a problem with that, but some older boards
appear to have screwed up the implementation.

Paul

That BIOS setting fixed the same problem for me...just changing the setting
to 1.1 fixed it...then switching back to 1.4 and all is well. No idea why it
worked.

-John O