DDR3-1600 w/Pentium G645 (only supports 1066)

Building grams a new machine. Here is what I have. I would like to buy 8GB of 1600 ram, link here:

Corsair XMS3 Series 8GB DDR3-1600 (PC3-12800) CL9 Dual Channel Desktop Memory Kit (Two 4GB Memory Modules)
http://www.microcenter.com/single_product_results.aspx?...

This is 1333 same brand if it makes a diff in stability
http://www.microcenter.com/single_product_results.aspx?...

The G645 only supports 1066 ram. With this mother board will it just down clock to 1066 no probs? I want this ram to avoid future upgrade, and the price is nice and cheap with rebate.

CPU: Pentium G645 2.9GHz ($50 @ microcenter)
http://www.microcenter.com/product [...] _Processor
Mobo: ASRock B75M-DGS LGA1155 ($50 @ superbiz)
http://www.superbiiz.com/detail.php?p=MB-B75MGDS&c=fr&s...
GPU: integrated w/G645
PSU: Corsair 430 Watt builders ($35 @ newegg)
http://www.newegg.com/Product/Prod [...] 430%20watt
Case: Powerspec TX-606 mATX Mini-Tower Computer Case ($25 @ microcenter)
http://www.microcenter.com/product [...] puter_Case

Thanks for anyhelp! Cheers!