AS SSD is a benchmark that uses non-compressible and completely random data. This benchmark is useful because some controllers, like the once popular but now defunct SandForce SF-2281, compress data first before moving them around. However, with non-compressible and random data, controllers cannot compress the data first, which forces them to deal with data as they are. Therefore, this is a useful benchmark to prevent drivers using controllers like the SF-2281 controller or similar from gaining an upper hand.
On AS SSD’s Copy Benchmark, we can see that the Samsung SSD 960 Pro was the runaway performer as it recorded the highest transfer speeds on all three workloads. Trailing behind was the OCZ RD400 and then the Plextor M8Pe. But it has to be said that both the OCZ and Plextor drives performed quite similarly. The ADATA XPG SX8000, on the other hand, was disappointing as its recorded transfer speeds were the lowest by a significant margin.
Moving on to sequential read and write performance, there’s no surprises as the Samsung SSD 960 Pro led the way once more with its blistering read and write speeds. The Plextor M8Pe came in second with its very competitive read and write speeds. The ADATA XPG SX8000 also faired quite well here with its very decent read and write speeds. Finally, the OCZ RD400 was erratic as its read speeds were good, but its write speeds were quite underwhelming, as it was the only drive to record under 1GB/s.
On the 4K workload, all four drives were quite comparable and competitive. The OCZ RD400 stood out for its high write speeds, but the Samsung SSD 960 Pro had the upper hand when it came to read speeds.
On the more intensive 4K, 64 thread workload, the Samsung SSD 960 Pro was the clear leader, recording speeds of over 1.2GB/s for both reads and writes. The Plextor M8Pe was a strong performer here, recording over 1GB/s read speeds and 631MB/s write speeds. The OCZ RD400 was a distant third, and the ADATA XPG SX8000 was quite disappointing once more as it was markedly slower than the fastest performing drives.