In the Full System Drive benchmark with an empty drive, the UD90 managed average bandwidth of 391.53 MB/s, with average access time of 70 μs (microseconds). Filled to 50% capacity, the performance dropped a bit to 332.64 MB/s average bandwidth and 83 μs average access time. As end-users tend not to use empty drives, all benchmarks to follow show results with the drive filled to the same 50% capacity.
But first, a word on the comparison charts to follow. I have not tested “low-end” PCIe Gen4 drives to this point, and putting this (currently) $62 drive up against the likes of a Samsung 990 PRO seems ridiculous. At some point there will be a more reasonable roundup of affordable drives, so please ignore the massive pricing gulf for now.
First, let’s take a look at random 4K reads and writes using CrystalDiskMark, at queue depths of 1, 2, 4, and 8 (all single-thread):
