Performance Comparisons – Client QD Weighted
These results attempt to simplify things by focusing on what really matters – the Queue Depths that folks actually see when using these products. A dimension is eliminated from the previous charts by applying a weighted average to those results. The weights were derived from trace recordings of moderate to heavy workloads, which still ended up running closer to QD=1-2 even on a slower SATA SSD. The intent here is to distill the results into something for those wanting 'just the facts' to grab and go when making their purchasing decisions. Don't be alarmed by the low figures. Remember, these are low queue depths – the place where these SSDs actually operate when in use by those not just running benchmarks all day!
Since client workloads lean heavily towards reads, keep a focus on the blue bars for a moment. The new WD and SanDisk parts turn in figures in the 19k range, which beat all other comps except for the Samsung 960 EVO at 20k and the PRO at 25k. For a caching SSD, these two new products come extremely close to Samsung's caching part.
Now let's shift to random writes (orange bars) for a moment. First, the new WD parts beat *all* comps here. We normally don't include Optane memory parts like the Intel SSD 800P or even the 900P because they walk all over NAND SSDs, but take a look at those results really quick and then come back here. The 800P turns in figures in the ~75-78k range, while the 900P pushes to the low 98k's. The WD Black is OVER 101k in this same test! That is the top score we have ever measured for this metric. Ever. …and it's beating an HHHL Optane SSD!
Samsung still owns the field for sequential reads, but once again the WD and SanDisk are cleaning house on writes, and yes, those are once again the highest recorded scores across all SSDs we've ever tested (scroll down), including Optane parts. It's really too bad that client workloads are typically heavier on reads than writes.
This % read sweep chart shows the random QD weighted results between full reads and full writes. We look for a smooth curve here and all SSDs behave as expected with no surprises.