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 $370Nvidia GTX 1070 $344Samsung 850 Evo 250GB $100
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $269Samsung 850 Evo 500GB $115
Intel Core i5-8600K $260AMD RX 480 $280Samsung 850 Pro 256GB $135
HDDRAMUSB
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3000 C15 2x8GB $145SanDisk Extreme 64GB $80
Seagate Barracuda 3TB (2016) $77G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 32GB $30
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3200 C16 2x8GB $155SanDisk Ultra Fit 32GB $11
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