What ram speed is the best?

Solution
Depends on what you do with the rig, multi-tasking, video work, imaging, CAD, VMs, anything that's memory centric higher freq is better, gaming doesn't really require high freq DRAM currently as it's mainly used as a data conduit, but even in gaming 1866 will get you a few extra FPS over 1600 and a few more at 2133....with prices near the same from 1600 to 2133 and at times even 2400 would go with the highest that fits your budget

Tradesman1

Legenda in Aeternum
Depends on what you do with the rig, multi-tasking, video work, imaging, CAD, VMs, anything that's memory centric higher freq is better, gaming doesn't really require high freq DRAM currently as it's mainly used as a data conduit, but even in gaming 1866 will get you a few extra FPS over 1600 and a few more at 2133....with prices near the same from 1600 to 2133 and at times even 2400 would go with the highest that fits your budget
 
Solution