CrystalDiskMark is a free disk benchmarking utility that is very simple to use. It takes eight measurements: the read and write speeds in megabytes per second (MBps) for sequential, 512KB, random 4KB and 4KB parallel disk operations. There are more screenshots from this benchmark posted on the web than any other, probably due to its clean and simple display. There is further information, including instructions on how to benchmark your own drives, on the CrystalDiskMark wiki page.

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CPUGPUSSDHDDUSB
Intel Core i7-4790K $318Nvidia GTX 970 $329Samsung 850 Pro 256GB $122WD Black 1TB (2013) $69SanDisk Extreme 64GB $32
Intel Core i5-4690K $230AMD R9 380 $220Samsung 850 Evo 500GB $156Barracuda 7200.14 1TB $49SanDisk Extreme 16GB $15
Intel Core i7-6700K $410AMD R9 390 $329Samsung 850 Evo 250GB $84WD Black 2TB (2013) $119SanDisk Extreme 32GB $22
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