First, DDR3-1600 is fine you'll need to either: 1. AI OC Tuner -> DOCP and use a DRAM OC Profile, or FSB -> 240HMz and adjust the CPU Multiplier/Ratio, or 3. CPU-NB Frequency -> 2400MHz. However, that's primarily for the AMD Phenom x4/x6 family. An AMD Athlon isn't the best choice with DDR3-1600,and the added instability isn't worth the fractional gains.
The RAM I posted are all 1.50v DDR3-1333 and will work easily and are 'plug 'n play.'
If you want something faster the DDR3-1333 CAS 7 RAM, I added (2) kits F3-10666CL7D-8GBXH & F3-10666CL7D-8GBRH - http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=100007611%20600006069&IsNodeId=1&bop=And&CompareItemList=147|20-139-075