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Meaning of "Quad"
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Mac Enthusiast
Join Date: Aug 2006
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does a quad 3Gz really have 12 Gz?or does it jut give you 4 that run sepratly at 3Gz? and a quad 64bit is....256bit or is it just a limit of 64 bit on each?  im not into the hardware of computers(as you can tell) but still am curious to the benifits of all this extra stuff.
[removed oversize sig image --tooki]
(Last edited by tooki; Sep 17, 2006 at 01:39 PM.
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Forum Regular
Join Date: Aug 2004
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The "quad" refers to the number of cores. There are 2 chips, each chip has 2 cores. Without bogging you down in details, each core behaves mostly as if it is a seperate chip. Each chip operates at the stated Ghz.
The the 32/64 refers to the largest piece of data the chip can handle. It doesn't directly impact the speed of the chips in the way you described.
-Xy
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MacPro (2.66, 4GB, 4x250GB, X1900+7300, 2x Dell 2005fpw, Samsung LNT4061)
MacBook Pro (2.2, 2GB, 120GB)
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Posting Junkie
Join Date: Oct 2005
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There are 4 64-bit 3Ghz chips in the Mac Pro. For some applications it will give you about the same performance as a single 12Ghz chip, while for others you'll get the same performance as a single 3Ghz chip.
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Clinically Insane
Join Date: Oct 2000
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I don't know if any app is threaded efficiently enough to give a true 400% boost in performance, or anything close thereto.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Junior Member
Join Date: Sep 2004
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There are a number of programs that scale almost linearly with extra processors. One example (though it is not a Mac OS X program) is LC5 (formerly L0phtCrack) by @stake ( @stake - Wikipedia, the free encyclopedia) which was formerly L0pht Heavy Industries and most recently acquired by Symantec.
I studied the metrics of this program for one project I worked on during my education. My results showed that in nearly every case LC5 used the symmetric multiprocessing (SMP, multiple processors) with almost 100% efficiency. In lay terms: 2 processors were twice as fast as 1, and 4 were twice as fast as 2.
Ideally, any program that processes independent data blocks without much need for I/O operations will scale in a near linear fashion with SMP.
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PowerBook G4 17-inch 1GHz (March 2003)
iBook G4 12-inch 1.33GHz (July 2005)
iMac 20-inch 2.0GHz Intel Core Duo (January 2006)
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Mac Enthusiast
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cool. thanks everyone 
MattJeff~
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