The bottleneck interface is likely to be a IC chip hardwired somewhere on the motherboard. The bottleneck you have is similar to that of using 1866 MHz DDR3 with a MB buss interface that can only deliver to the CPU chipset at a rate of 1333MHz. While the 1866MHz RAM works just fine with the 1333MHz MB and with a CPU that might easily handle 1866MHz, both will be limited to the 1333MHz MB interface conduit that connects the two (among ***many*** other things the two must communicate with via the MB).

So, yes, your CPU might be able to easily handle SATA3 drive rates but only if you had a SATA3-rated  MB interface between it and the SATA3 drive.

Jack E/NJ           

You might check to see if you can get any additional system info for your particular machine by doing an online scan at http://edge.crucial.com/store/listparts.aspx?mfr=Acer&model=TravelMate%20B113-E-2409 

The SATA-3 comments therein only pertain to the drive and not necessarily your motherboard. It states that "Data Transfer Rate is the rate at which data can be sent or received. This is determined by your motherboard. A drive with a higher transfer rate will only run at the rate of the motherboard's transfer rate "

It's conceivable that you could find a SATA-3  mainboard that would fit your case. But you're likely not gonna get much of a bang for the bucks you're gonna spend on the upgrade.

Jack E/NJ