The What's Next Western Digital event back in May 2022 saw the introduction of new products in the WD_BLACK lineup. On the portable SSD (PSSD) front, the WD_BLACK P40 Game Drive SSD augmented the company's strong set of offerings in the gaming market. As a complement to the popular WD_BLACK P50 Game Drive SSD, the new PSSD retained the USB 3.2 Gen 2x2 (20 Gbps) link while adding RGB lighting to the case.

The P40 was launched at a much lower price point compared to the P50. In order to achieve the lower price point and make the P40 a mid-range offering, the company has cut some corners while still advertising the drive as a 2GBps-class one. The review below presents a detailed evaluation of the WD_BLCK P40 Game Drive SSD and compares it against a host of other PSSDs in the same capacity class. Our analysis reveals use-cases where the P40 does make sense to use without spending much more for the premium-class P50.


External bus-powered storage devices have grown both in storage capacity as well as speeds over the last decade. Thanks to rapid advancements in flash technology (including the advent of 3D NAND and NVMe) as well as faster host interfaces (such as Thunderbolt 3 and USB 3.x), we now have palm-sized flash-based storage devices capable of delivering 3GBps+ speeds. While those speeds can be achieved with Thunderbolt, mass-market devices have to rely on USB. Within the USB ecosystem, USB 3.2 Gen 2 (10 Gbps) is fast becoming the entry level for thumb drives and portable SSDs. Premium devices sporting the USB 3.2 Gen 2x2 (20 Gbps) interface have been making it to the market over the last couple of years, with host support in desktops and other computing platforms starting to pick up. Broadly speaking, there are five distinct performance levels in this market:

  • 2GBps+ drives with Thunderbolt 3 or USB4, using NVMe SSDs
  • 2GBps drives with USB 3.2 Gen 2x2, using NVMe SSDs or direct USB flash drive (UFD) controllers
  • 1GBps drives with USB 3.2 Gen 2, using NVMe SSDs or direct UFD controllers
  • 500MBps drives with USB 3.2 Gen 1 (or, Gen 2, in some cases), using SATA SSDs
  • Sub-400MBps drives with USB 3.2 Gen 1, using UFD controllers

The PSSD we are looking at today - the WD_BLACK P40 Game Drive - belongs to the second category in the above list. Western Digital's WD_BLACK lineup of products targets the gaming market, with focus on performance numbers as well as industrial design / RGB lighting. The company has also been using the lineup to bring new technology to the market - such as the WD_BLACK P50 Game Drive SSD back in 2019. It was one of the first 20 Gbps PSSDs to hit the market when it was launched. This allowed the company to charge a premium for the high-performance product that continues to this day. In an attempt to expand the lineup with a mid-range offering, WD launched the P40 Game Drive SSD with very similar specs (up to 2000 MBps) earlier this year at a much lower price point.

The WD_BLACK P40 Game Drive SSD retains the industrial design and appearance of its premium sibling, while being slightly more compact. One of the key updates appreciated by the target market is the addition of RGB lighting (controllable via WD's dashboard software) to the case. Instead of supplying two separate cables, WD is providing a single Type-C to Type-C cable with an attached Type-C to Type-A adapter.

WD_BLACK P40 Game Drive SSD - Package Contents

The solid aluminum metal casing lends a rugged look to the drive, and lays to rest any potential thermal concerns during operation.


CrystalDiskInfo provides a quick overview of the PSSD as seen by the host system. The P40 support S.M.A.R.T passthrough and TRIM, as shown in the screenshot below. Compared to the DRAM-equipped SN750E used in the P50, WD is using a DRAM-less SN560E in the P40. The cost-savings translate to the lower price on the P40 compared to the P50.

S.M.A.R.T Passthrough - CrystalDiskInfo

The table below presents a comparative view of the specifications of the different storage bridges presented in this review.

Comparative Direct-Attached Storage Devices Configuration
Downstream Port 1x PCIe 3.0 x4 (M.2 NVMe) 1x PCIe 3.0 x4 (M.2 NVMe)
Upstream Port USB 3.2 Gen 2x2 Type-C USB 3.2 Gen 2x2 Type-C
Bridge Chip ASMedia ASM2364 ASMedia ASM2364
Power Bus Powered Bus Powered
Use Case Mid-range 2GBps-class, compact, and sturdy portable SSD in a gumstick form-factor targeting the gaming market Premium 2GBps-class, compact, and sturdy portable SSD in a gumstick form-factor targeting the gaming market
Physical Dimensions 107 mm x 51 mm x 13 mm 118 mm x 62 mm x 14 mm
Weight 79 grams (without cable) 115 grams (without cable)
Cable 30 cm USB 3.2 Gen 2x2 Type-C to Type-C
Attached Type-C female to Type-A male adapter (resultant Type-C to Type-A cable length : 33 cm)
30 cm USB 3.2 Gen 2x2 Type-C to Type-C
30 cm USB 3.2 Gen 2 Type-C to Type-A
S.M.A.R.T Passthrough Yes Yes
UASP Support Yes Yes
TRIM Passthrough Yes Yes
Hardware Encryption Not Available Not Available
Evaluated Storage Western Digital SN560E PCIe 3.0 x4 M.2 2280 NVMe SSD
SanDisk / Toshiba BiCS 5 112L 3D TLC
Western Digital SN750E PCIe 3.0 x4 M.2 2280 NVMe SSD
SanDisk / Toshiba BiCS 4 96L 3D TLC
Price USD 130 USD 210
Review Link WD_BLACK P40 Game Drive SSD 1TB Review WD_BLACK P50 Game Drive SSD 1TB Review #1 (2020)
WD_BLACK P50 Game Drive SSD 1TB Review #2 (2021)

Prior to looking at the benchmark numbers, power consumption, and thermal solution effectiveness, a description of the testbed setup and evaluation methodology is provided.

Testbed Setup and Evaluation Methodology

Direct-attached storage devices are evaluated using the Quartz Canyon NUC (essentially, the Xeon / ECC version of the Ghost Canyon NUC) configured with 2x 16GB DDR4-2667 ECC SODIMMs and a PCIe 3.0 x4 NVMe SSD - the IM2P33E8 1TB from ADATA.

The most attractive aspect of the Quartz Canyon NUC is the presence of two PCIe slots (electrically, x16 and x4) for add-in cards. In the absence of a discrete GPU - for which there is no need in a DAS testbed - both slots are available. In fact, we also added a spare SanDisk Extreme PRO M.2 NVMe SSD to the CPU direct-attached M.2 22110 slot in the baseboard in order to avoid DMI bottlenecks when evaluating Thunderbolt 3 devices. This still allows for two add-in cards operating at x8 (x16 electrical) and x4 (x4 electrical). Since the Quartz Canyon NUC doesn't have a native USB 3.2 Gen 2x2 port, Silverstone's SST-ECU06 add-in card was installed in the x4 slot. All non-Thunderbolt devices are tested using the Type-C port enabled by the SST-ECU06.

The specifications of the testbed are summarized in the table below:

The 2021 AnandTech DAS Testbed Configuration
System Intel Quartz Canyon NUC9vXQNX
CPU Intel Xeon E-2286M
Memory ADATA Industrial AD4B3200716G22
32 GB (2x 16GB)
DDR4-3200 ECC @ 22-22-22-52
OS Drive ADATA Industrial IM2P33E8 NVMe 1TB
Secondary Drive SanDisk Extreme PRO M.2 NVMe 3D SSD 1TB
Add-on Card SilverStone Tek SST-ECU06 USB 3.2 Gen 2x2 Type-C Host
OS Windows 10 Enterprise x64 (21H1)
Thanks to ADATA, Intel, and SilverStone Tek for the build components

The testbed hardware is only one segment of the evaluation. Over the last few years, the typical direct-attached storage workloads for memory cards have also evolved. High bit-rate 4K videos at 60fps have become quite common, and 8K videos are starting to make an appearance. Game install sizes have also grown steadily even in portable game consoles, thanks to high resolution textures and artwork. Keeping these in mind, our evaluation scheme for direct-attached storage devices involves multiple workloads which are described in detail in the corresponding sections.

  • Synthetic workloads using CrystalDiskMark and ATTO
  • Real-world access traces using PCMark 10's storage benchmark
  • Custom robocopy workloads reflective of typical DAS usage
  • Sequential write stress test

In the next section, we have an overview of the performance of the WD_BLACK P40 Game Drive SSD in these benchmarks. Prior to providing concluding remarks, we have some observations on the device's power consumption numbers and thermal solution also.

Synthetic Benchmarks - ATTO and CrystalDiskMark
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  • TheCurve - Saturday, November 19, 2022 - link

    Loved this review! Direct, no fluff, just honest advice and data
  • AlB80 - Sunday, November 20, 2022 - link

    Support for USB3 10Gbps x2 links are optional for USB4.
  • hMunster - Monday, November 21, 2022 - link

    Does OS X finally support TRIM on non-Thunderbolt external SSDs?
  • Techie2 - Monday, December 5, 2022 - link

    It's now December and not a single Gen 5 consumer SSD is being offered for sale. That's rather strange considering all the hoopla and claims that these drives would be available in Oct. '22.
  • yifu - Tuesday, December 13, 2022 - link

    we need to support anandtech, when innerfidelity went away, there is only commercials reviews. we need, we need some kind of honest authority, otherwise it's just chaos, and shit!!!
    I have allowed anandtech from ad blocker.
  • sonsjhon09 - Thursday, December 29, 2022 - link

    I appreciate your work

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