Real life performance, Not going to see a biggy betwene the Intel Sata II ports and the mavel Sata III ports.
SSDs perform bestter with Intel iaSTor controller. SSDs take a hit when placed on marvel control effectively negating the Sata III bandwidth increase..
DON"T sweat Sequencial read/right benchmarks. ONE - High scores do not translate to High real life performance for an OS + Program dive. TWO Sequencial is least important matrix.
Us AS SSD to look at your drive, upper left will show:
.. Make and FW ver
.. Driver for Intel Chipset the best driver is iaSTor followed by msahci. If IDE it will also show "BAD"
.. Also will show if partitions are aligned properly.
There are some "real life" bench marks out there that shou that there is not a big diff operating a sata III SSD on Sata II vs SATA III, Yes there is some the key word here is not a Big diff.
Bottom line: instal on Intel Sata II port and use Intel's latest chipset driver. Don't run Benchmark, but be impressed with the great performance gain over what it replaced - a Mechanical HDD.
PS Your bench mark program uses data that is Highly compressable, not real life like. AS SSD comes closer (still not perfect) while I find the best to be PCMark Vantage for simulating a real user experience.