CPU two cores or one core
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From: shegeek72 on 19 Jan 2010 17:36 On Jan 19, 7:50 am, "Ian D" <tau...(a)nowhereatall.com> wrote: > P4s only have single cores. Pentium Ds are dual core. Starting with > the Prescott series, P4s have hyperthreading, (HT). There is one > physical core and a virtual core. This appears as 2 CPUs in Task > Manager. For an OS and apps that can utilize HT, this allows for > more efficient thread scheduling as there are 2 processing paths, > although the individual threads are still processed sequentially. > In a true multicore CPU the threads can be processed simultaneously. What's interesting is Intel brought back hyperthreading in its i7 series. If you have a CPU monitor that can display multiple cores you'll see 8 cores!
From: Paul on 19 Jan 2010 18:23 Gabriel Knight wrote: > Hi all > > I have this CPU here : > > http://www.cpu-world.com/sspec/SL/SL7Z9.html > > I have installed one in a pc before and it came up as a two core, as in when > I look in "task manager" then "performance" there are two cubes for the "CPU > Usage History"... Is this CPU a Dual Core? as far as I know its a P4 single > core CPU. > > Thanks > GK > A Hyperthreaded processor has one physical core and one virtual core. The virtual core gets to run, if the physical core is blocked. As such, you get 1.1x performance than if the virtual core is turned off. So Hyperthreading, at the best of times, gives 10% more performance. The main benefit, may be a slightly smoother desktop, due to less blocking of running tasks (i.e. you can feel a difference between a single core AthlonXP and a hyperthreaded P4, when both have the same performance level). http://processorfinder.intel.com/Details.aspx?sSpec=SL7Z9 A Pentium D by comparison, has two physical cores and you get 2.0x performance. http://processorfinder.intel.com/details.aspx?sSpec=SL88S Both processors (the hyperthreaded single core and the true dual core) would have two graphs in Task Manager. If you were to turn off Hyperthreading in the BIOS, then the next time the OS boots, there would be one graph. Paul
From: TVeblen on 20 Jan 2010 06:43 On 1/19/2010 5:36 PM, shegeek72 wrote: > On Jan 19, 7:50 am, "Ian D"<tau...(a)nowhereatall.com> wrote: > > P4s only have single cores. Pentium Ds are dual core. Starting > with >> the Prescott series, P4s have hyperthreading, (HT). There is one >> physical core and a virtual core. This appears as 2 CPUs in Task >> Manager. For an OS and apps that can utilize HT, this allows for >> more efficient thread scheduling as there are 2 processing paths, >> although the individual threads are still processed sequentially. >> In a true multicore CPU the threads can be processed simultaneously. > > What's interesting is Intel brought back hyperthreading in its i7 > series. If you have a CPU monitor that can display multiple cores > you'll see 8 cores! > In Windows 7 there is an advanced boot feature that allows you to tell the OS how many "processors" it can work with to speed boot time. So for an i7-920 machine should this setting be 4 or 8?
From: DevilsPGD on 20 Jan 2010 14:34 In message <hj6q8j$mk2$1(a)news.eternal-september.org> TVeblen <Killtherobots(a)hal.net> was claimed to have wrote: >On 1/19/2010 5:36 PM, shegeek72 wrote: >> On Jan 19, 7:50 am, "Ian D"<tau...(a)nowhereatall.com> wrote: >> > P4s only have single cores. Pentium Ds are dual core. Starting >> with >>> the Prescott series, P4s have hyperthreading, (HT). There is one >>> physical core and a virtual core. This appears as 2 CPUs in Task >>> Manager. For an OS and apps that can utilize HT, this allows for >>> more efficient thread scheduling as there are 2 processing paths, >>> although the individual threads are still processed sequentially. >>> In a true multicore CPU the threads can be processed simultaneously. >> >> What's interesting is Intel brought back hyperthreading in its i7 >> series. If you have a CPU monitor that can display multiple cores >> you'll see 8 cores! >> >In Windows 7 there is an advanced boot feature that allows you to tell >the OS how many "processors" it can work with to speed boot time. So for >an i7-920 machine should this setting be 4 or 8? Unless you have specific needs, you're probably best off leaving it alone. Defaulting to all processors logical processors is generally the way to go, and this is the default.
From: TVeblen on 20 Jan 2010 15:36
On 1/20/2010 2:34 PM, DevilsPGD wrote: > In message<hj6q8j$mk2$1(a)news.eternal-september.org> TVeblen > <Killtherobots(a)hal.net> was claimed to have wrote: > >> On 1/19/2010 5:36 PM, shegeek72 wrote: >>> On Jan 19, 7:50 am, "Ian D"<tau...(a)nowhereatall.com> wrote: >>> > P4s only have single cores. Pentium Ds are dual core. Starting >>> with >>>> the Prescott series, P4s have hyperthreading, (HT). There is one >>>> physical core and a virtual core. This appears as 2 CPUs in Task >>>> Manager. For an OS and apps that can utilize HT, this allows for >>>> more efficient thread scheduling as there are 2 processing paths, >>>> although the individual threads are still processed sequentially. >>>> In a true multicore CPU the threads can be processed simultaneously. >>> >>> What's interesting is Intel brought back hyperthreading in its i7 >>> series. If you have a CPU monitor that can display multiple cores >>> you'll see 8 cores! >>> >> In Windows 7 there is an advanced boot feature that allows you to tell >> the OS how many "processors" it can work with to speed boot time. So for >> an i7-920 machine should this setting be 4 or 8? > > Unless you have specific needs, you're probably best off leaving it > alone. > > Defaulting to all processors logical processors is generally the way to > go, and this is the default. The default setting is one processor. Regardless, it doesn't make any noticeable difference either way. |