Query about Bandwidth rate computation

December 3, 2010 at 08:44:38
Specs: Win Xp Sp3, P4 3.0ghz / 1gb ddr 400
Many websites list pci (32bit) can achieve up to 133mb/s but according to this http://www.pcguide.com/ref/mbsys/bu... they are wrong. U have to multiply 133 by 0.95367 to get the real pci bandwidth. if this is true, it will change a lot of bandwidth's(agp, pci-e, qpi, fsb etc) for eg. Ddr2 800 max bandwidth will not 6400mb/s it will be 6103mb/s. I need someone to tell me if this is correct or not. Thanks

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#1
December 3, 2010 at 09:21:42
thats weird i know this equation for the fsbin mb\s
bus frequency * 4 (quad pumped) * 64 (bits) / 8 (to convert to byte). depending on ur fsb if its 200 so its 800/8 which gives 6400mb\s thats the equation i know
from the link u gave he said 32/8*33.3=133.3 MB/sec which i think is correct but then he said 32/8*33.3*1,000,000/1,048,576=127.2 MBytes/second.
which is weird
check this
http://www.compute-aid.com/64bitpci...

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#2
December 3, 2010 at 09:45:33
"not technically correct" may be it is ok to say max bandwidth of pci(32bit) is 133.3mb/s just like it's ok to call pci-e, qpi, hypertransport a bus, technically it's not a bus. Iam not 100% sure.

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