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 EVO 120GB |
 Samsung SSD 850 EVO 120GB (RAPID Mode) |
 Samsung SSD 850 PRO 256GB |
 Samsung SSD 840 EVO 750GB |
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 EVO 120GB |
 Samsung SSD 850 EVO 120GB (RAPID Mode) |
 Samsung SSD 850 PRO 256GB |
 Samsung SSD 840 EVO 750GB |
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 EVO's random read and write speeds, random access times and the number of operations per second.
 Samsung SSD 850 EVO 120GB - Read Benchmark |
 Samsung SSD 850 EVO 120GB (RAPID Mode) - Read Benchmark |
 Samsung SSD 850 PRO 256GB - Read Benchmark |
 Samsung SSD 840 EVO 750GB - Read Benchmark |
 Samsung SSD 850 EVO 120GB - Write Benchmark |
 Samsung SSD 850 EVO 120GB (RAPID Mode) - Write Benchmark |
 Samsung SSD 850 PRO 256GB - Write Benchmark |
 Samsung SSD 840 EVO 750GB - Write Benchmark |
The 850 EVO performed relatively well when benchmarked with HD Tune. The drive had average read and write speeds of 498.5 MB/s and 156.5 MB/s, respectively, and a burst rate of 206.4 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 EVO 120GB - Random Access Read |
 Samsung SSD 850 EVO 120GB (RAPID Mode) - Random Access Read |
 Samsung SSD 850 PRO 256GB - Random Access Read |
 Samsung SSD 840 EVO 750GB - Random Access Read |
 Samsung SSD 850 EVO 120GB - Random Access Write |
 Samsung SSD 850 EVO 120GB (RAPID Mode) - Random Access Write |
 Samsung SSD 850 PRO 256GB - Random Access Write |
 Samsung SSD 840 EVO 750GB - Random Access Write |
The 850 EVO didn't disappoint when doing random reads and writes. When writing 4KB blocks, it reached 21,522 IOPS and had an average speed of 84.070 MB/s. The drive was slightly faster when reading, reaching 22,158 IOPS with an average speed of 86.557 MB/s. As you can see, RAPID mode gave the 850 EVO's random read and write performance a considerable boost. With it enabled, the drive reached 107,192 random read IOPS and 129,483 random write IOPS.
