Yes, it does. I just disabled HT in BIOS and the number of cores goes up to 4, with 4 threads.
With HT disabled, Control Panel shows 4 CPU graphs.
Did not check with HT enabled.
lol thats weird.... maybe a problem with the CPU??? i have a similar problem, I have 12gb of ram installed onto my system and one day my core i7 920 decided to say 10gb, turns out it was the processor. I sent mine for warranty replacement. Try using CPU-Z to see what does that tell you.
PD. I used CPUZ and it turned out to show the 12gb of ram whereas both bios and OS said 10gb
Hi. Hope this might help unless u already have sorted it. But there might be other out there wanna know the solution. Now this is in general to rule out issues with one or more of the multiple cores and is by default unboxed. You can read more here: BOOT advanced option
Anyway, here it is a quick check for you(this is also in the abow link):
type "administrative tools" in the search bar on Start and klick it.
This will open a window for you. You will there choose "system configuration"
Klick on the tab "Boot" and choose "advanced options". U might have selected number of processors. Uncheck the box and accept.
Reboot is necessary.