hrrm ,
6x ACARD's go 62k on PCMV and 2 C300 and 2 LE's go 100K?
and these acards win the PCMV world record by a decent margin over 8 C300?
what exactly is going on ?

results over these benches seem non scientific at all, every bench shows different figures, it is almost impossible to get a real approximation of any hardware behavior over any real time work load .

as for the cache on the 1231ML vs the ICHR, maybe it's the protocol differences between the PCI-e and the south bridge interconnects (DMI), the raid card could be suffering from it's own overhead, maybe an HBA such as the 9211 would act differently or more closer to the south bridge,
it should be tested maybe with the same SSD's setup, to figure out the real difference, the 2GB the acards give vs the 3GB the 2 C300 and 2 LE's isn't a severe difference,
it could be burst speed, yet if this benchmark is being finished in a second for 3GB of data transfer then this is all cache operation.

on a different matter,
how in hell, did IOMeter random read 4KB test with this setup did 510MBps vs the CDM 31MBps?
there isn't seem to be any queue depth involved as the average access time is at ~0.4ms (or either it's 32 which is still very high compared to 4 X25-V's at 290MBps).
and last last thing is, it seems the merge between the LE's and the C300 has droped down the C300 relatively high 0.7 write access time to only 0.212).