OWC 32GB (2 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S9M032K) at Amazon.com
My PC has an i3 3240 processor and 4GB 1333 MHz RAM DDR3. Can I put another RAM but has more than 1600 MHz? - Quora
Kllisre Ddr3 8gb 1333mhz 1600mhz Ram Memory Support Dual Channel Pc Desktop Dimm - Rams - AliExpress
Is the DDR3 8GB 1600MHz RAM supported for an Intel H61S1 motherboard? - Quora