i7 920 can get 8cores with HT enabled

[romulan]

i7 920 cant get 8cores with HT enabled

ive got an i7 920, on a 21 multiplier averclocked to 4.1GHZ with HT enabled.
problem is only 4 cores showing in cpu-z and everest.
when i was running stock speeds, 8 cores were showing but since my overclock, i only have 4.
anyone know why?
my board is a p6t deluxe v2.

thanks in advance.

ade

 

[romulan]

shows 4 cores, 4 threads

 

[romulan]

hyperthreading definatelt enabled, will run some tests tonight and see if i can find out at which point i lose hyperthreading.
my psu is an antec cp-850w

 

[romulan]

checked bios and HT definately enabled.
also reset bios to factory defaults and everest and cpu-z still show 4 cores/4 threads.
help!!!!!

 

[romulan]

thanks for the help guys, i re-stalled windows and now 8 cores showing again.

cheers