Is FSB and Bus Speed same or different for all cores?

afnan123456

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Jun 12, 2012
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Does every core in the processor has the same bus speed and the same fsb even if their clocks are different?To make it simple, does the whole processor has its bus speed and fsb or the cores have their separate FSB speeds and Bus speeds?
 
Solution
FSB has nothing to do with the cores. Technically, FSB is outdated, since the Core i series the design is different and Intel calls the equivalent "DMI."

Bus speed is everything outside the cores themselves - primarily memory. The cores take the bus speed and pass it through a "multiplier" to get much higher speeds within the core. The bus speed stays constant but the multiplier ratio can change to let the cores run slower or faster depending on workload.
FSB has nothing to do with the cores. Technically, FSB is outdated, since the Core i series the design is different and Intel calls the equivalent "DMI."

Bus speed is everything outside the cores themselves - primarily memory. The cores take the bus speed and pass it through a "multiplier" to get much higher speeds within the core. The bus speed stays constant but the multiplier ratio can change to let the cores run slower or faster depending on workload.
 
Solution
the "front side bus" or FSB is an alternate blanket term for "cpu frequency," "north bridge frequency," and "ram frequency." In short it's an overarching frequency for the northbridge chipset of your computer. It existed in a similar fashion on all AMD and Intel chips up until Sandy Bridge, when intel moved most of their northbridge and part of their southbridge onto the cpu itself. From that point on Intel stopped using FSB, and started using BCLK, which operated similarly to FSB, only it also included the frequency the PCI-E slots, USB ports AND SATA ports ran on as well, which meant overclocking through bumping the BCLK tends to be both dangerous and extremely limited. (AMD actually never used a FSB, though on motherboards it's often refered to as such, when AMD started to use hypertransport (HT) even their FSB version called EV6 vanished. That said, AMD continued to support a "cpu frequency" function, and on some motherboards its still called FSB)

If you bump the FSB you tend to be overclocking several things at once (northbridge, ram and cpu)... including ALL of the cpu cores. Now most motherboards are able to automatically adjust the multipliers on the northbridge and ram to make a FSB overclock invisible to you, and allow you minuet control over those parts of your system. That said older boards had no such features, meaning you had to manually adjust the multipliers on your ram and northbridge to find the speeds you wanted when you overclocked using the FSB.
 

afnan123456

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Jun 12, 2012
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Thanks for your answer, i understand what you say, fsb was integerated in the CPUs and is different in architecture from the actual FSB. I get the fsb part, now I m creating a monitoring software, should i get Different bus speeds for all cores of a processor or a SINGLE bus speed for all cores. Please explain this.
 


there is one cpu frequency... and a cpu multiplier. the multiplier can be different on different cores. the frequency cannot.
 

afnan123456

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Jun 12, 2012
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OK thanx, the bus speed is same for all cores and there's only one bus. I guess that's my answer :)
 

afnan123456

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Well, to be precise, this is the bus i m talking about: http://www.mediafire.com/?msbex75o5xr7av6