This is my first post on this forum! Last week my 6 core MP with 512 GB and D700's 12 GB arrived (replacing my 3.1) I had already received 64 GB RAM (Crucial) form B&H. After days of slow and erratic performance I suspected a hardware problem. I ran Geekbench to see if I could spot something. With the 64 GB of RAM from Crucial http://browser.primatelabs.com/geekbench3/472030 With my 12 GB original RAM that came from Apple http://browser.primatelabs.com/geekbench3/472068 Check the difference in memory performance; 326 single core and 350 mulit core for the 64 GB Crucial memory, then 2992 single core and 4335 multi core with the 12 GB that came with the computer. It now opens 5D3 RAW files in a second or two instead of 15 to 30 seconds! What a waist of time and energy it has been trying to figure out what was wrong.