Internals, Testing Methodology and System Setup


The front and rear of the RD400 pre-installed on its adapter card look just about like any other adapter-installed M.2 SSD out there.

A 512GB capacity with what appears to be only two flash packages? This bears more investigation:

The lettering had essentially zero contrast and was near impossible to read, so the above image was lighted in a unique way and post processed to make things a bit clearer. The controller is TC58NCP070GSB and the flash is TH58TFTJFLBAEG, which appears to be Toshiba 15nm 128Gbit die parts. How do you get 256GB out of a single flash package when the dies only hold 16GB each? You stack them 16 high of course!

Yes that's right, just like AMD's HBM employs TSV to stack RAM dies, Toshiba is using it to stack flash dies. The principle is the same, and it enables higher die stacks with less complication and failure rate.

Another thing that I noted while looking at the RD400 layout and part numbers was the striking similarity to the Toshiba XG3 SSD. We hadn't reviewed the XG3 itself since it was an OEM-only part, but The SSD Review did a piece on it. I performed the same ATTO run as their piece and here is what I found:

I believe it's safe to say that Toshiba simply put their OEM XG3 (with a possible tweak or two) under the OCZ umbrella of retail products. This makes sense as OCZ is essentially Toshiba's consumer facing SSD brand.

Testing Methodology

Our tests are a mix of synthetic and real-world benchmarks. IOMeter, HDTach, HDTune, Yapt and our custom File Copy test round out the selection to cover just about all bases. If you have any questions about our tests just drop into the Storage Forum and we'll help you out!

Test System Setup

We have several storage testbeds. A newer ASUS P8Z77-V Pro/Thunderbolt and an ASUS Z87-PRO. Variance between both boards has been deemed negligible when testing SATA devices. Future PCIe and SATA device testing, including this review, take place on a new ASUS Sabertooth X99, which comes equipped with USB 3.1, M.2, and can also handle SFF-8639 devices with the proper adapter.

PC Perspective would like to thank Intel, ASUS, Corsair, Kingston, and EVGA for supplying some of the components of our test rigs. 

Hard Drive Test System Setup
CPU Intel Core i7 5820K @ 4.125 GHz
Motherboard ASUS Sabertooth X99
Memory 16GB Micron DDR4 @ 3333
Hard Drive G.Skill 32GB SLC SSD
Sound Card N/A
Video Card EVGA GeForce GTX 750
Video Drivers GeForce Game Ready Driver 347.88
Power Supply Corsair CMPSU-650TX
DirectX Version N/A
Operating System Windows 8.1 Pro X64 (update)
  • PCPer File Copy Test
  • HDTach
  • HDTune
  • IOMeter
  • YAPT
  • PC Perspective Exclusive Latency Percentile
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