Change them, and go into Windows, then Run any Benchmark such as 3Dmark, SiSoft Sandra, Super PI, memTest86 or whatever..
if it can complete the test succefully, then just leave it, otherwise, change them back
it does NOT hurt to TRY
of if u want, by adding Voltage, you can run them with faster speed
I got a Crucial/Micron RAM, which rated at 2.5/3/3/6, I could run them at 2.5/2/2/5 at default voltage without any problem, and by adding 0.1 Volt, I can run it perfectly at 2/2/2/5
since Corsair is a great manufacturer of making ram as we all know, you shouldn't have any problem to run it faster