Is there anything I should be aware of while swapping the 3.5" 500 gig drive for a 2.5" 256 gig SSD in an iMac? A local Mac tech suggested there may be issues with the thermal sensor on the drive. It's got the Intel 6 Series SATA chipset and a system report shows that the link speed is 6 gig with a negotiated speed of 3 gig. Will that interface provide SATA 3 (my guess) or SATA 2 speeds? TIA.