A A desktop orientated measure of RAM speed that favours bandwidth over latency.
Real world performance scales reasonably well with memory frequency (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 allows faster retrieval of individual blocks of data which can allow some 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 and their effective speeds here.

The Best.
CPUGPUSSD
Intel Core i7-8700K $340Nvidia GTX 1070 $447Samsung 850 Evo 250GB $95
AMD Ryzen 5 1600 $170Nvidia GTX 1060-6GB $295Samsung 850 Evo 500GB $137
Intel Core i7-7700K $290AMD RX 480 $330Samsung 850 Pro 256GB $139
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $180SanDisk Extreme 64GB $41
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $960SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $60HyperX Fury DDR4 2133 C14 2x8GB $226SanDisk Extreme 16GB $20
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