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WD Blue 3D & SanDisk Ultra 3D 1TB SATA III SSDs Review

By: Jon Coulter | SSDs in Storage | Posted: Sep 6, 2017 4:14 pm
TweakTown Rating: 97%Manufacturer: SanDisk

70/30 Mixed Workload Test (Sledgehammer)

 

Version and / or Patch Used: Iometer 2014

 

Heavy Workload Model

 

This test hammers a drive so hard we've dubbed it "Sledgehammer." Our 70/30 Mixed Workload test is designed to simulate a heavy-duty enthusiast/workstation steady-state environment. We feel that a mix of 70% read/30% write, full random 4K transfers best represents this type of user environment. Our test allows us to see the drive enter into and reach a steady state as the test progresses.

 

Phase one of the test preconditions the drive for 1 hour with 128K sequential writes at QD32. Phase two of the test runs a 70% read/30% write at QD32, full random 4K transfer workload on the drive for 1 hour. We log and chart (phase two) IOPS data at 5-second intervals for 1 hour (720 data points). 60 data points = 5 minutes.

 

wd-blue-3d-sandisk-ultra-1tb-sata-iii-ssd-review_65

 

What we like about this test is that it reflects reality. Everything lines up, as it should. Consumer drives don't outperform Enterprise-Class SSDs that were designed for enterprise workloads. Consumer drives based on old technology are not outperforming modern Performance-Class SSDs, etc.

 

As we saw when we tested the Toshiba XG5 which uses the same 64-layer flash as the Blue 3D and the Ultra 3D, the sledgehammer drops pretty hard on BiCS 3. Just as it does on Intel 64-layer flash. Even the planar based WD Blue delivers better average performance.

 

 

 

Sustained Sequential Write

 

Version and / or Patch Used: Iometer 2014

 

Heavy Workload Model

 

We write to the drive for 1 hour with 128K sequential writes at QD32. We log and chart megabytes per second data at 5-second intervals for 1 hour (720 data points). 60 data points = 5 minutes.

 

wd-blue-3d-sandisk-ultra-1tb-sata-iii-ssd-review_66

 

The Blue 3D and the Ultra 3D both deliver an average sustained sequential write performance of 503 MB/s for an hour. This isn't as good as we are getting from the 850 EVO, but it is far better than we are getting from Intel's 545s which is based on IMFT 64-layer flash. This further illustrates the advantage that TLC 3D flash has over planar TLC flash.

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