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Samsung 850 EVO 250GB 3D V-NAND SSD Review

By: Chris Ramseyer | SSDs in Storage | Posted: Dec 8, 2014 9:05 pm
TweakTown Rating: 97%Manufacturer: Samsung

Futuremark PCMark 8 Extended - Consistency Test

 

Version and / or Patch Used: 2.0.228

 

Heavy Usage Model:

 

Futuremark's PCMark 8 allows us to wear the test drive down to a reasonable consumer steady state, and then watch the drive recover on its own through garbage collection. To do that, the drive gets pushed down to steady state with random writes, and then idle time between a number of tests allows the drive to recover.

 

Precondition Phase:

1. Write to the drive sequentially through up to the reported capacity with random data.

2. Write the drive through a second time (to take care of overprovisioning).

 

Degradation Phase:

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for ten minutes.

2. Run performance test (one pass only).

3. Repeat one and two, eight times, and on each pass, increase the duration of random writes by five minutes.

 

Steady state Phase:

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for 50 minutes.

2. Run performance test (one pass only).

3. Repeat one and two, five times.

 

Recovery Phase:

1. Idle for five minutes.

2. Run performance test (one pass only).

3. Repeat one and two, five times.

 

PCMark 8's Consistency test provides a ton of data output that we use to judge a drive's performance. Here we see the three states of performance for the select SSDs, light use, consumer steady state, and worst case.

 

Storage Bandwidth - All Tests

 

samsung_850_evo_250gb_3d_v_nand_ssd_review_64

 

In this next series of tests, we show the 850 EVO both with and without RAPID Mode enabled.

 

Storage Bandwidth - Heavy Load

 

samsung_850_evo_250gb_3d_v_nand_ssd_review_65

 

In both configurations, with and without RAPID Mode, the 850 EVO does poorly under heavy use. The SLC buffer is full, and the drive is pressed into operating at TLC speeds.

 

Storage Bandwidth - Typical Consumer Load

 

samsung_850_evo_250gb_3d_v_nand_ssd_review_66

 

Things change under typical consumer conditions. On its own, the 850 EVO performs well, but is still outpaced by a small group of other drives. Once you enable RAPID Mode, the 850 EVO shoots off to levels of performance that are impossible to achieve with regular consumer SSDs.

 

RAPID Mode is a software built into the Magician software. Samsung will release Magician 4.5 today, and new RAPID algorithms included in the software deliver higher levels of performance. Magician software is free to use for Samsung SSD owners, starting with the 840 Pro / EVO series.

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