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SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape

By: Chris Ramseyer | SSDs in Storage | Posted: Sep 12, 2014 5:00 pm
TweakTown Rating: 92%Manufacturer: SanDisk

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. Here we see the three states of performance for the select SSDs, light use, consumer steady state and worst case.

 

sandisk_ultra_ii_240gb_ssd_review_sandisk_tlc_nand_flash_takes_shape_64

 

For most mainstream users the performance to look at in this series are the orange and red bars. The orange and red bars show lighter workload conditions typically used with low cost SSDs. In all three workloads, the Ultra II is faster than the MX100, but slower than the ARC 100.

 

Storage Bandwidth All Tests

 

sandisk_ultra_ii_240gb_ssd_review_sandisk_tlc_nand_flash_takes_shape_65

 

Here we see all of the tests. The measurements start after the drives are in steady state and Recovery 1 starts adding 5 minute delays between each performance run. After the Ultra II recovers from the random write steady state, the performance increases significantly, but is still a hair lower than the ARC 100.

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