Because it boosts write speeds but doesn't work so well when reading, the drive recorded a high average write speed of 409.47MB/s but a greatly diminished 240.79MB/s read.
It was here where nCache 2.0 was most visibly at work. Lastly, we ran our most demanding small files test. We measured an average read speed of 416.97MB/s and an average write speed of 414.13MB/s, which again is decent rather than spectacular. In the large file test, the Ultra 3D SSD to its credit didn't slow down too much, considering it had a lot more files to deal with. In the huge file test, for instance, the SanDisk drive averaged a read speed of 425.91MB/s and a write speed of 487MB/s, which is fine but not on par with the best of the best. Things were a bit closer in our own file transfer tests, which replicate real-life usage more accurately than synthetic benchmarks, but the Ultra 3D SSD still came out behind, sometimes by more than 100MB/s. By contrast, the 860 Evo scored 400.8MB/s and 364MB/s respectively - it's not even a close fight. Switching to CrystalDiskMark's 4K file test saw read speeds drop to an underwhelming 254.2MB/s, and write speeds to 237.6MB/s. However, when subjected to more gruelling tasks, the Ultra 3D SSD doesn't hold up nearly as well. In the standard sequential test, it scored an immense read speed of 563MB/s and an equally impressive 535MB/s write speed. Besides slightly exceeding SanDisk's own advertised speeds, these also edge ahead of the 860 Evo, if only by about 1MB/s in the read test and 3MB/s in the write test. Testing with CrystalDisk Mark, it initially looks as though the Ultra 3D SSD will go blow-for-blow on performance as well. SanDisk Ultra 3D SSD 500GB review: Performance You might only end up saving a pound or two on the 860 Evo equivalent, as SanDisk's SSD is still near the higher end of the SATA-based market, but still. The Ultra 3D SSD also comes in very slightly cheaper than its Samsung rival: we calculated its cost per gigabyte as 24.3p for the 250GB model, 20.8p for the 500GB model, 24p for the 1TB model and 18.7p for the 2TB model.
That's still very ambitious, as even the 860 Evo only claims to reach 550MB/s read and 520MB/s write. Opt for the smallest capacity, and these drop to 550MB/s read and 525MB/s write. Before we get to benchmark results, let's take a look at the key specs: the Ultra 3D SSD is available in 250GB, 500GB (the model we're reviewing here), 1TB and 2TB varieties, all of which, with the exception of the 250GB model, are quoted as having a maximum read speed of 560MB/s and a maximum write speed of 530MB/s. The Ultra 3D SSD is a good showcase of nCache 2.0 in action, and that goes for demonstrating its limitations as well as showing off its benefits. Samsung 860 Evo review 250GB: The best SATA SSD you can buy
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