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Sabrent Rocket 4 Plus vs. WD_BLACK SN850

The Rocket 4 Plus and Western Digital WD_BLACK SN850 are two of the latest NVMe PCIe 4.0 solid state drives. So, what are the main differences between these competing products?

You can find out in this comparison guide between the Sabrent and Western Digital SSDs.

Quick Summary

When comparing the same capacities, the 1 TB Sabrent Rocket 4 Plus and 1 TB WD_BLACK SN850 are identical at maximum sequential reading and maximum sequential writing.

With that said, the 2 TB Sabrent Rocket 4 Plus has a slightly faster maximum sequential read speed as well as being quite a bit faster at maximum sequential writing speed when compared to the 2 TB WD_BLACK SN850.

If you are interested, you can purchase either of the aforementioned solid state drives on Amazon with the following links:

You can also check out our comparison between the SN850 and 980 Pro with this guide. Furthermore, you can take a look at how the Rocket 4 Plus stacks up against the other similar Sabrent SSDs with this article.

Rocket 4 Plus vs. SN850 Comparison Chart

You can find a comparison table for the two PCIe 4.0 storage drives below.

 Sabrent Rocket 4 Plus NVMe PCIe 4.0 SSDWD_BLACK SN850 NVMe PCIe 4.0 SSD
Capacity Options1 TB

2 TB

4 TB
500 GB

1 TB

2 TB
Optional Heatsink VariantNoYes
Model Numbers1 TB Rocket 4 Plus: SB-RKT4P-1TB

2 TB Rocket 4 Plus: SB-RKT4P-2TB

4 TB Rocket 4 Plus: SB-RKT4P-4TB
500 GB WD_Black SN850: WDS500G1X0E-00AFY0

1 TB WD_Black SN850: WDS100T1X0E-00AFY0

2 TB WD_Black SN850: WDS200T1X0E-00AFY0

500 GB WD_Black SN850 with Heatsink: WDS500G1XHE-00AFY0

1 TB WD_Black SN850 with Heatsink: WDS100T1XHE-00AFY0

2 TB WD_Black SN850 with Heatsink: WDS200T1XHE-00AFY0
Form FactorM.2 2280M.2 2280
InterfacePCIe 4.0 x4PCIe 4.0 x4
NAND3D TLCBiCS4 96L TLC
ControllerPhison PS5018-E18WD_BLACK G2
Maximum Sequential Read Speed1 TB Rocket 4 Plus: Up to 7000 MB per second

2 TB Rocket 4 Plus: Up to 7100 MB per second

4 TB Rocket 4 Plus: Up to 7100 MB per second
500 GB WD_Black SN850: Up to 7000 MB per second

1 TB WD_Black SN850: Up to 7000 MB per second

2 TB WD_Black SN850: Up to 7000 MB per second
Maximum Sequential Write Speed1 TB Rocket 4 Plus: Up to 5300 MB per second

2 TB Rocket 4 Plus: Up to 6600 MB per second

4 TB Rocket 4 Plus: Up to 6600 MB per second
500 GB WD_Black SN850: Up to 4100 MB per second

1 TB WD_Black SN850: Up to 5300 MB per second

2 TB WD_Black SN850: Up to 5100 MB per second
Warranty5-year warranty5-year warranty
PricingCheck price on Amazon.Check price on Amazon.

Capacity Options

The Rocket 4 Plus is the only one of these two storage drives to come with a 4 TB capacity option while the WD_BLACK SN850 is the only one to offer a 500 GB capacity option.

Both SSDs can be purchased in 1 TB and 2 TB capacities.

You can find a breakdown of the available capacity options for both products below:

Rocket 4 Plus:

  • 1 TB
  • 2 TB
  • 4 TB

WD_BLACK SN850:

  • 500 GB
  • 1 TB
  • 2 TB

Optional Heatsink Variant

The SN850 comes with a variant that includes a heatsink.

Model Numbers

You can take a look at the model numbers for the Sabrent and Western Digital solid state drives below:

  • 1 TB Rocket 4 Plus: SB-RKT4P-1TB
  • 2 TB Rocket 4 Plus: SB-RKT4P-2TB
  • 4 TB Rocket 4 Plus: SB-RKT4P-4TB
  • 500 GB WD_Black SN850: WDS500G1X0E-00AFY0
  • 1 TB WD_Black SN850: WDS100T1X0E-00AFY0
  • 2 TB WD_Black SN850: WDS200T1X0E-00AFY0
  • 500 GB WD_Black SN850 with Heatsink: WDS500G1XHE-00AFY0
  • 1 TB WD_Black SN850 with Heatsink: WDS100T1XHE-00AFY0
  • 2 TB WD_Black SN850 with Heatsink: WDS200T1XHE-00AFY0

Form Factor

The two storage drives in this versus guide use the M.2 2280 form factor.

Interface

Both internal SSDs use the PCIe 4.0 x4 interface.

NAND

For NAND, the Sabrent Rocket 4 Plus comes equipped with 3D TLC while the Western Digital WD_BLACK SN850 is equipped with BiCS4 96L TLC.

Controller

When it comes to the controller, the Rocket 4 Plus uses the Phison PS5018-E18 while the WD_BLACK SN850 uses the WD_BLACK G2.

Maximum Sequential Read Speed

When comparing the same capacity options for maximum sequential reading speeds, the 1 TB Rocket 4 Plus and 1 TB WD_Black SN850 are identical.

The 2 TB Rocket 4 Plus does have a little bit faster max reading speed when compared to the 2 TB WD_Black SN850. The advantage is 100 MB per second, which translates to an increase of 1.43%.

You can take a look at the maximum sequential read speed specifications for both internal drives below:

  • 1 TB Rocket 4 Plus: Up to 7000 MB per second
  • 2 TB Rocket 4 Plus: Up to 7100 MB per second
  • 4 TB Rocket 4 Plus: Up to 7100 MB per second
  • 500 GB WD_Black SN850: Up to 7000 MB per second
  • 1 TB WD_Black SN850: Up to 7000 MB per second
  • 2 TB WD_Black SN850: Up to 7000 MB per second

Maximum Sequential Write Speed

The 1 TB Rocket 4 Plus and the 1 TB WD_Black SN850 are also identical when it comes to maximum sequential writing speeds.

On the other hand, the 2 TB Rocket 4 Plus is 1500 MB per second faster than the 2 TB WD_Black SN850. This translates to a sizable 29.41% advantage.

You can check out the maximum sequential write speeds below:

  • 1 TB Rocket 4 Plus: Up to 5300 MB per second
  • 2 TB Rocket 4 Plus: Up to 6600 MB per second
  • 4 TB Rocket 4 Plus: Up to 6600 MB per second
  • 500 GB WD_Black SN850: Up to 4100 MB per second
  • 1 TB WD_Black SN850: Up to 5300 MB per second
  • 2 TB WD_Black SN850: Up to 5100 MB per second

Warranty

The Sabrent Rocket 4 Plus NVMe PCIe 4.0 Solid State Drive and Western Digital WD_BLACK SN850 NVMe PCIe 4.0 Solid State Drive each comes with a 5-year warranty.

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