How do I find out if my laptop is SATA III compatible?

I've currently got a Dell Inspiron 15R Special Edition laptop with an Ivy Bridge Core i5-3210M, 4GB of RAM and a 1TB WD Scorpio Blue hard drive in it. I'm thinking of taking it out and upgrading to a 120GB Samsung 840 Evo. I just want to make sure that my laptop is SATA 6Gbps compatible, because my current hard drive is running at 3Gbps. Is there any software utility or something that can tell me? It has an Intel HM77 chipset by the way.