8-core PC but only 4 processors being used

[ECS1]

hi all

I have 8 processors and they all show up in the Device Manager. Under Windows XP all 8 of these were utilised, but I recently went over to Windows 7 and it only uses 4.

How can I resolve this problem?

thks a lot

ed

 

[mckillwashere]

Im showing that the Intel Xeon X5365 is only a 4 thread processor.

 

[ECS1]

Maybe I have two of them?

Not sure about the tech details - 8 of them show up under "processors" in Device Manager, and under Windows XP when I ran task manager, under "performances" you could see all 8 working. Now it's only 4.

 

[mckillwashere]

Ya need more that win 7 home premium mate

Multi-core processor and multiprocessor limits

The maximum quantity of cores in 1 physical processor of a PC that Windows 7 supports is: 32 for 32-bit, 256 for 64-bit. The maximum quantity of physical processors of a PC that Windows supports is: 2 for Professional, Enterprise, and Ultimate; 1 for Starter, Home Basic, and Home Premium.http://en.wikipedia.org/wiki/Windows_7#cite_note-115


http://en.wikipedia.org/wiki/Windows_7
at the very bottom
http://en.wikipedia.org/wiki/Windows_7#cite_note-115

 

[Pusspa]

i read somewhere here it is related to win7 'parking' the cores. i will try to find the thread.

EDIT: http://www.sevenforums.com/performance-maintenance/118577-easy-way-improve-cpu-usage.html

 

[mckillwashere]

Its related to a software limitation to the os much like early versions of Xp being able to utilize 4+ gb or ram and no be x64. And Win7 Starter not being able to use more than 2Gb or ram.

 

[ECS1]

How very annoying - the guy who upgraded for me obviously didn't know that and recommended Home Premium!

Thanks for the info.

 

[mckillwashere]

Not a problem.
Sorry about that

 

[PeaB4YouGo]

Ya need more that win 7 home premium mate

Multi-core processor and multiprocessor limits

The maximum quantity of cores in 1 physical processor of a PC that Windows 7 supports is: 32 for 32-bit, 256 for 64-bit. The maximum quantity of physical processors of a PC that Windows supports is: 2 for Professional, Enterprise, and Ultimate; 1 for Starter, Home Basic, and Home Premium.


Windows 7 - Wikipedia, the free encyclopedia
at the very bottom

I use W7 Home Prem, I have a 4 core i7 processor and I see 8 processors running in nearly ALL my processor monitors. Each core has two processors. That is the way I understood it would work BEFORE I bought the system. Is Wiki wrong, this time?

 

[mckillwashere]

Ya need more that win 7 home premium mate

Multi-core processor and multiprocessor limits

The maximum quantity of cores in 1 physical processor of a PC that Windows 7 supports is: 32 for 32-bit, 256 for 64-bit. The maximum quantity of physical processors of a PC that Windows supports is: 2 for Professional, Enterprise, and Ultimate; 1 for Starter, Home Basic, and Home Premium.


Windows 7 - Wikipedia, the free encyclopedia
at the very bottom

I use W7 Home Prem, I have a 4 core i7 processor and I see 8 processors running in nearly ALL my processor monitors. Each core has two processors. That is the way I understood it would work BEFORE I bought the system. Is Wiki wrong, this time?

you have one physical processor.... he has 2 look up the specs for his machine. it linked directly to the MS website.

 

[Hopalong X]

PeaB4

You have four cores and 8 threads. Windows shows all 8 threads as seperate processors.
Hyper Threading.

Intel® Hyper-Threading Technology: Your Questions Answered - Intel® Software Network

 

[pparks1]

I use W7 Home Prem, I have a 4 core i7 processor and I see 8 processors running in nearly ALL my processor monitors. Each core has two processors. That is the way I understood it would work BEFORE I bought the system. Is Wiki wrong, this time?

You have a single physical processor with 4 logical cores and hyper threading enabled thus showing you 8 total CPU's.

In the case of this user, he has 2 physical CPU's with 4 logical cores on each one. Windows Home Premium is limited to 1 physical CPU socket...thus only 1 of his CPU's can be used.

You will need to move to Windows 7 Professional or Ultimate.

 

[Layback Bear]

Thanks pparks1 I get it now. Nice to know information for next build.

 

[sygnus21]

Sorry, I'm a little confused the OP's answer here....

Maybe I have two of them?

Not sure about the tech details - 8 of them show up under "processors" in Device Manager, and under Windows XP when I ran task manager, under "performances" you could see all 8 working. Now it's only 4.

Is the OP asking the question, or giving the answer???

I "assume" the OP has two based on the other info given, but...

Just my way of thinking

 

[stormy13]

sygnus21, pparks1 hit the answer,

In the case of this user, he has 2 physical CPU's with 4 logical cores on each one. Windows Home Premium is limited to 1 physical CPU socket...thus only 1 of his CPU's can be used.

You will need to move to Windows 7 Professional or Ultimate.

he just needed to go a little further with what the OP said about all 8 cores showing up and active in XP. Don't forget that XP Pro supported up to 2 sockets as well (and was a never ending source of confusion and debate with regards to XP Home when dual cores started coming out, which Home supported no problem).

 

[sygnus21]

@stormy13,

That I understood, and given the info as a whole, I agree. It's just that question he posed

Thanks