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Samsung 850 Pro 1TB SSD Review - The New Performance King - PCMark 8 Consistency Test

Samsung 850 Pro 1TB SSD Review - The New Performance King
Utilizing the most advanced NAND structure to date, the Samsung 850 Pro takes SATA past the Extreme. Today Chris gives us his full thoughts in this review. (KRX:005930)
| SSDs in Storage | Posted: Jul 1, 2014 2:00 am
TweakTown Rating: 90%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 10 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 8 times, and on each pass increase the duration of random writes by 5 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 1 and 2 for 5 times.

 

Recovery Phase:

1. Idle for 5 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 5 times.

 

Storage Bandwidth

 

PCMark 8's Consistency test provides a ton of data output that we use to judge a drive's performance.

 

TweakTown image content/6/4/6478_60_samsung_850_pro_1tb_ssd_review_the_new_performance_king.png

 

Here we get our first look at the new RAPID Mode that now uses up to 4GB of DRAM, up from the previous 1GB mark. RAPID will use 25% of your system DRAM, up to 4GB total on a system with 16GB.

 

Also in this section is the 850 Pro 1TB without RAPID Mode, let's start with that configuration. The 850 Pro on it's own manages to secure the top spot for Recovery 1 and Recovery 1 performance. These are light use and after idle time performances. The blue line, heavy use, shows the 850 Pro is a little slower than the Extreme PRO 960GB but only by a small margin.

 

RAPID Mode increases the two light load performances but decreases the performance under a heavy, dirty state. The DRAM cache fills up and then needs to dump the data to the drive while at the same time data is coming and going from the drive. This slows everything down some. Cache misses also comes into play as well as they add latency.

 

Storage Bandwidth - All Tests

 

TweakTown image content/6/4/6478_61_samsung_850_pro_1tb_ssd_review_the_new_performance_king.png

 

Here we see the bandwidth results from all of the tests. RAPID does a very good job when the road is open, like when under a light workload or the flash is clean. The 850 Pro 1TB on it's own does much better under heavy load and manages to secure a position in the hyper class of 1TB products. The SanDisk Extreme PRO, the 850 Pro's only competition in this capacity size delivers more consistent bandwidth but is a little slower than the flash is clean.

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