Well...It talks about increasing CPU performance, (Core i5 M 520, Westmere generation) have XOR performance of over 4 GB/s and RAID-6 syndrome performance over 3 GB/s over a single execution core. It seems it doesn't touch on rebuilding part. With your latest CPU running XOR, I haven't seen a...
Not sure when LSI use these MRAM for the HBA. But you can have a look on the review of the 9300-4i4e
The card also have this chip there
Well..it is just the basic requirement for a 3008 to support Integrated Mirroring.
There is nothing about Cache, the chip itself has 6MB memory