AS SSD:
AS SSD is a relatively new benchmark designed specifically for solid state drives. The application contains five synthetic tests used to determine the sequential and random read and write performance of a drive.
 Samsung SSD 850 PRO 256GB |
 Samsung SSD 850 PRO 256GB (RAPID Mode) |
 Samsung SSD 840 Evo 750GB |
 Samsung SSD 840 Pro 512GB |
AS SSD also includes a copy benchmark. This test copies an ISO (two large files), program (many small files) and game (small and large files), returning the speed and duration of each.
 Samsung SSD 850 PRO 256GB |
 Samsung SSD 850 PRO 256GB (RAPID Mode) |
 Samsung SSD 840 Evo 750GB |
 Samsung SSD 840 Pro 512GB |
HD Tune Pro 4.61:
Next, I ran a series of tests using HD Tune Pro. This hard disk utility measures a drive's performance by testing its sequential read and write speeds as well as its access time, burst rate and CPU usage. For this review, I'm also going to use it to benchmark the 850 PRO's random read and write speeds, random access times and the number of operations per second.
 Samsung SSD 850 PRO 256GB - HD Tune Read Benchmark |
 Samsung SSD 850 PRO 256GB (RAPID Mode) - HD Tune Read Benchmark |
 Samsung SSD 840 Evo 750GB - HD Tune Read Benchmark |
 Samsung SSD 840 Pro 512GB - HD Tune Read Benchmark |
 Samsung SSD 850 PRO 256GB - HD Tune Write Benchmark |
 Samsung SSD 850 PRO 256GB (RAPID Mode) - HD Tune Write Benchmark |
 Samsung SSD 840 Evo 750GB - HD Tune Write Benchmark |
 Samsung SSD 840 Pro 512GB - HD Tune Write Benchmark |
The 850 PRO performed very well when benchmarked with HD Tune. The drive had average read and write speeds of 498.6 MB/s and 474.8 MB/s, respectively, and a burst rate of 276.7 MB/s when reading. Surprisingly, RAPID mode had very little impact on the drive's read speed. However, it was slightly faster when writing.
 Samsung SSD 850 PRO 256GB - HD Tune Random Access Read |
 Samsung SSD 850 PRO 256GB (RAPID Mode) - HD Tune Random Access Read |
 Samsung SSD 840 Evo 750GB - HD Tune Random Access Read |
 Samsung SSD 840 Pro 512GB - HD Tune Random Access Readd |
 Samsung SSD 850 PRO 256GB - HD Tune Random Access Write |
 Samsung SSD 850 PRO 256GB (RAPID Mode) - HD Tune Random Access Write |
 Samsung SSD 840 Evo 750GB - HD Tune Random Access Write |
 Samsung SSD 840 Pro 512GB - HD Tune Random Access Write |
The 850 PRO didn't disappoint when doing random reads and writes. When writing 4KB blocks, it reached 21,878 IOPS and had an average speed of 85.461 MB/s. The drive was slightly faster when reading, reaching 24,646 IOPS with an average speed of 96.275 MB/s. As you can see, RAPID mode gave the 850 PRO's random read and write performance a considerable boost. With it enabled, the drive reached 159,033 random read IOPS and 128,419 random write IOPS.
