Slow SSD speed with OWC Mercury Elite Pro Dual

[DerKommissar]

So, I wanted a low cost way to test to see if my problems are the SSD or the enclosure. I've got an old MacBook Pro 13 inch Mid 2010 lying around that I have intended to fix up for my daughter, so I picked up the cheapest 120 Gb SSD at Microcenter- the Sandisk SSd Plus. It's got read speeds high enough to test the limits of the enclosure, and I won't be paying for any performance that the SATA II in the MacBook can't use. So, this crappy little Sandisk had significantly faster reads- 364 MBs, a figure I believe to be closer to the limit of the enclosure. Writes were a bit slower than my Crucial at 288 MBs, but they were far more steady- write speed is quite variable on the Crucial. So...I guess we know the answer. While I do think the enclosure is limited to well below TB 1 speeds, my Crucial MX 300 is also performing significantly under its benchmarks on reads. It's too late for me to take it back, so I'm a bit ticked over the whole thing. I'm guessing either I have a bum Crucial MX 300 SSD OR there's something strange about it's performance in Mac OS X (OR there is a performance penalty from being a boot drive). I don't think it's worth doing an internal install after these results. A bargain basement SSD should not bench better than the Crucial.