Home Premium 64 and TWO dual cores

I have a HP Pavilion a6767c. It is a 64 bit machine. It has TWO Core Duo ES300's at 2.6 Ghz. (Thats 4 processors in all on TWO core duos). I am running Vista Home Premium.

My question: Other formus say that Home Premium will use multiple cores, but only one processor, whereas Business or Ultimate will use multiple processors and multiple cores.

When I ctl-alt-del the performance monitor has only two graphs.
Does this mean that Home Premium is only using one of the two dual cores and that I need to upgrade to Vista Ultimate to have the OS use both dual cores?

I bought the box for Autocad and I want maximum performance.

Thanks for any light anyone can shine on this question.

Hi DeFoster and welcome to Vista Forums

I found the following information for you. It would appear that the Home editions of Vista only support 1 physical processor. You can get dual processor support by upgrading to Ultimate.

More... http://www.winsupersite.com/showcase/winvista_editions_final.asp

id love one of those dual processor boards but i think its a bit daft to have 2x duo's, i would have personally gone for 2x quad's
but interesting to know that only ultimate supports 2 and the others only 1

Dwarf said:

Hi DeFoster and welcome to Vista Forums

I found the following information for you. It would appear that the Home editions of Vista only support 1 physical processor. You can get dual processor support by upgrading to Ultimate.
View attachment 14581
More... http://www.winsupersite.com/showcase/winvista_editions_final.asp

Click to expand...

your table seems a bit inaccurate as a 32-bit system will only EVER support 4GB on RAM, for the same reason FAT32 file systems are no longer true FAT32, a true FAT32 file system will only support 4GB volumes because that is as high as you can count using 32 bits of information. in these times that is not nearly enough and for the users that have to have a FAT32 file system for whatever reason use xFAT which the system percieves as a FAT32 but isn't really. xFAT lies to the system. a 64-bit system however will support the Maximum amount of physical memory supported by the machine