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Old 02-15-2008, 11:42 PM
Mark Kirkwood
Default Looking for PCI-X external SATA controller

I wrote:

I think 64-bit 66Mhz PCI will actually do 526Mb/s theoretical maximum
... I can achieve 220Mb/s real I/O bandwidth (4 disk array) on my gear
here. (old Supermicro P4TDER).

Actually, doing the calculation properly gets 508 MB/s (532 MB/s is
often quoted, but that is using 1000 instead of 1024 bytes to the
Mbyte). For the interested:

32-bit 33.33 Mhz PCI bus can transfer 32*33.33*1000000/(8*1024*1024) =
127 MB/s
32-bit 66.66 MHz PCI bus can transfer 32*66.66*1000000/(8*1024*1024) =
254 MB/s

64-bit 66.66 MHz PCI bus can transfer (skip obvious calc now) 508 MB/s

Clearly PCI-X with its 100, 133.33 and 266.66 MHz variants will get you
763, 1017 and 2034 MB/s.



P.S : also typo'ed the machine - is a P3TDER...
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