In a full system drive benchmark using a blank drive, the UD90 managed an average bandwidth of 391.53 MB/s and an average access time of 70 μs (microseconds). At 50% capacity, performance degraded slightly with an average bandwidth of 332.64 MB/s and an average access time of 83 μs. End users tend not to use blank drives, so all the benchmarks I follow show results when the drives are filled to the same 50% capacity.
But first, a word of comparison tables to follow. I haven’t tested the “lower end” PCIe Gen4 drives yet, but comparing this (currently) $62 drive to the likes of the Samsung 990 PRO seems silly. It seems. At some point there will be a more reasonable roundup of affordable drives.
First, let’s use CrystalDiskMark to look at random 4K reads and writes with queue depths of 1, 2, 4, and 8 (all single-threaded).
