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Mac Pro Westmere Internal SATA Bandwidth

Last updated 2010-09-05 - Send Feedback
Related: bandwidth, Mac Pro, Macs, RAID, RAID scalability, SSD

The 2010 Mac Pro motherboard still has a maximum bandwidth of around 690MB/sec for internal SATA ports, as shown below (I’ve previously tested with up to 4 SSDs in the 2009 model).

Using DiskTester, I tested a RAID-0 stripe of 3 X 200GB OWC Mercury Pro RE solid state drives. That configuration ought to reach speeds of about 840MB/sec for reads, and 780MB/sec writes, if scalability were perfect.

The actual speed figures shown below are not so high, because the Mac Pro SATA ports share a maximum bandwidth limitation.

Since two SSDs are good for about 510MB/sec reads and 470MB/sec writes (as actually measured), the improvement with three of them is not as impressive as one might hope.

Still, there’s no denying that even two SSDs offer a level of performance that outstrips the ability of most programs to use it. Using three SSDs is a smart move for anyone working with programs like PTGui.

Actual measured speed vs performance available from SSDs

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Lloyd recommends 32GB RDIMM modules for most users (more expensive LRDIMMS are for 512GB or more).



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