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HD Tune — Transfer rates
HD Tune lets us present transfer rates in a couple of different ways. Using the benchmark's "full test" setting gives us a good look at performance across the entire drive rather than extrapolating based on a handful of sample points. The full test gives us fodder for line graphs, which we've split up by drive maker. You can click the buttons below each line graph to see how the 840 Pro Series and our mechanical hard drive compare to different SSDs.

To keep the line graphs from getting too crowded, the comparisons with competitor drives include only the 840 Pro with the latest DXM04B0Q firmware. The Samsung line graphs show how the initial 840 Series and 840 Pro releases stack up against the new firmware for each model. The results based on the new firmware are identified with parentheses, so they should be easy to spot. We've also set apart the 840 Pro using a different shade than the other Samsung SSDs.

The new firmware has no impact on the 840 family's read performance in HD Tune. Samsung dominates the top of the standings, with the 840 Pro and 840 Series practically tied for first place. Impressively, the next-fastest drive is the old 830 Series.

Here, we get our first glimpse of the difference in performance characteristics between the Samsung 840 Series and its Pro sibling. The Pro offers much higher sequential writes speeds, beating its TLC-equipped counterpart by about 175MB/s. It's not even close.

Although the MLC-based drives provide stiffer competition, the 840 Pro is still the fastest of the bunch. Once again, the new firmware has no effect on performance.

HD Tune runs on unpartitioned drives, a setup that isn't always ideal for SSDs. For another perspective, we ran CrystalDiskMark's sequential transfer rate tests, which call for partitioned drives. We used the app's default settings: a 1GB transfer size with randomized data.

Different benchmark, same story for the Samsung SSDs. The 840 Pro leads the field in both the read and write speed tests, highlighting the poor write performance of the standard 840 Series. Here, the difference in write speed amounts to nearly a factor of two.

The 840 Pro's closest competition is the OCZ Vector, which is the fastest non-Samsung drive in both CrystalDiskMark tests. Only 1MB/s separates the Vector from the 840 Pro in the write speed test, though the OCZ drive trails by a wider margin in the read speed test.