CPU, Mobo, RAM questions? I am confused!

I will build a PC with a CPU i5-2500K and RAM DDR3-1600, but I found out that Intel says the following (See this at Intel website):

Max RAM: 32GB
RAM type: DDR3-1066/1333
Max RAM bandwidth: 21 GB/s
ECC Memory Supported: No

Thus, according to Intel, I should pick a DDR3-1066/1333 and not DDR3-1600. I was going to buy the DDR3-1600 because I will build using a Gigabyte GA-Z68X-UD3H-B3. Could someone explain why I thought I could use DDR3-1600?

I see what happened. The Gigabyte motherboard manual states the following:

Support for DDR3 2133/1866/1600/1333/1066 MHz memory modules.

Then, what should I do? Go with what Gigabyte says or Intel? Thanks.