I don't think so. There is NO controller made yet with TRIM for ANY SATA III drive. Marvell is lying about having it on their controller just so they can sell their controllers to MB manufacturers. Well know fact.
If this was the case, wouldnt a lot of people not recommend the c300?
Wouldnt reviews add a con for a lack of TRIM or garbage cleaning?
At least have the decency to google around.