A A desktop orientated measure of RAM speed that favours bandwidth over latency.
Memory frequency scales reasonably well with real world performance which is largely determined by data throughput. The more GB of data that can be transferred per second the better. If two sets of memory have the same bandwidth (GB/s) then the better performing kit will have lower latency. Lower latency memory allows faster retrieval of individual blocks of data which therefore allow computations to complete faster. The effective RAM speed index is weighted as 80% multi-core throughput, 10% single-core throughput and 10% latency. Dual channel RAM running at 3000 MHz on a skylake chip ~= 100%. See a current list of RAM Kits sorted by effective speed here.

The Best.
CPUGPUSSD
Intel Core i7-7700K $309Nvidia GTX 1070 $382Samsung 850 Evo 250GB $100
Intel Core i5-7600K $231AMD RX 480 $608Samsung 850 Pro 256GB $135
AMD Ryzen 7 1700 $280Nvidia GTX 1060-6GB $248Samsung 850 Evo 500GB $167
HDDRAMUSB
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $34
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $696SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $40HyperX Fury DDR4 2133 C14 2x8GB $133SanDisk Ultra Fit 32GB $13
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