Samsung DDR3-1333 4GB/512Mx64 Original Memory at Amazon.com
Kingston ValueRAM 16GB 1333MHz DDR3 PC3-10666 ECC Reg CL9 DIMM DR x4 Server Memory KVR13R9D4/16 at Amazon.com
eat your DDR4. my DDR3 does 2200mhz cl 10-13-13-38. yes, cl10! the trick is to ignore reddit and just put the voltage higher than what they say is safe, you'll get better
8GB DDR3 1866MHz PC3-14900 DIMM Memory for Apple Mac Pro
Crucial 8GB Kit (2 x 4GB) DDR3L-1333 SODIMM Memory for Mac | CT2K4G3S1339M | Crucial.com