I have 2 SSDs (same model, smaller capacity) for / connected on the mainboard. 
Their sync write performance is also poor - less than 600 iops, 4k blocks. 

On Nov 7, 2013, at 9:44 PM, Kyle Bader <kyle.ba...@gmail.com> wrote:

>> ST240FN0021 connected via a SAS2x36 to a LSI 9207-8i.
> 
> The problem might be SATA transport protocol overhead at the expander.
> Have you tried directly connecting the SSDs to SATA2/3 ports on the
> mainboard?
> 
> -- 
> 
> Kyle
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