Can someone tell me?!?!

[lerum 49]

This would only happen in windows!

One CPU *magically* turns into two overnight!

[kryppe 0]

lol, its probably the skin / theme that you are using for XP that has screwed up

[hijinks 40]

do you have a hyperthreading cpu?

[lerum 49]

i do have hyperthreading, i'm also overclocking @3.6Ghz

 

the processor is the new LGA775 socket and originally it was 3Ghz

[anyweb 490]

hyperthreading=two cpu's as far as windows and linux are concerned

 

try disabling hyperthreading in the bios and reboot, boom only one cpu appears

 

cheers

 

anyweb

[lerum 49]

so does it run double the speed or is it windows trying to make out that it is better that it really is?

[anyweb 490]

windows is correctly reporting that there are 'two' cpu's

 

http://www.pcworld.com/news/article/0,aid,107492,00.asp

 

linux does the EXACT same thing (install a modern distro on that box and you'll get the SMP kernel by default, smp= Symmetric Multiprocessing )

 

if you want to know if it runs at double the speed of 'one' cpu then do a benchmark, or better yet, google for Hyperthreading Performance

 

this is not a windows issue at all,

 

 

cheers

 

anyweb

 

Hyperthreading in Windows

 

Hyperthreading in Linux

[lerum 49]

i'll try most of them!

[hijinks 40]

its not gonna run at twice the speed. using linux in our weather models we get around a 30% performance gain with HT on using the 2.6 kernel. So it is some gain but not twice.

 

Basically HT allows the CPU to do two commands per clock cycle so it seems it as two cpu's