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WD Black SN850X SSD Review – Quick Conclusion

The WD Black SN850X is a great SSD – If you came to this review wondering whether it is a good drive, I can unquestionably say it 100% is. You are getting a much more evolved and current upgrade on the already popular SN850 and a drive that is a much more comparable drive to recent releases from the likes of Seagate Firecuda 530, whilst also throwing significant shade at the Samsung 980 Pro into the bargain. Digging a little deeper into the specs of the SN850X itself shows that a handful of strategic (and of course more recently developed improvements at the WD R&D level) are what push this drive much further along in the food chain that then2020 released SN850. That said, some areas of the SN850X have seen little or no change since the SN850, such as near identical durability ratings (TBW/DWPD) and the drive still running a little hotter than it’s competitors. Had WD released the SN850X at the tail end of 2021 (when information of the X version of the WD Black SSD first emerged), then I think it would have made a considerably bigger impact! Nonetheless, WD is riding something of a hot streak with their WD Black PCIe4 series right now (the release of the more affordable HMB built SN770 and the SN850 getting official PS5 Compatibility by Sony), so releasing the WD Black SN850X right now, as the PCIe5 generation drags its feet commercially due to hardware shortages and the pandemic affecting the supply chain) makes alot of sense too. The SN850X arrives with a price point that, when stacked up against the 2yr available SN850, may seem a pinch high, but it won’t be long till we see this newly established PCIe4 WD Black family more organically tier its pricing. Bottom line, if you were considering the SN850 SSD for your gaming or content creation setup (or indeed any other setup that will leverage ‘write’ activity) I would strongly recommend stretching your budget a pinch further and opting for the WD Black SN850X SSD. It is worth remembering though that unless you are running a particularly powerful setup, you will only see improvements in the SN850X over the SN850 in write performance, with only marginally improvements in read rates.

Testing the WD Black SN850X m.2 PCIE4 NVMe SSD

The WD Black SN850X 2TB was provided by WD for this test and it was tested using multiple benchmark tools, from a cold boot, in the 2nd storage slot (i.e not the OS drive). Each test was conducted three times (full details of this are shown in the YouTube Review of the WD Black SN850X over on NASCompares):

Test Machine:

• Windows 10 Pro Desktop System
• Intel i5 11400 Rocket Lake – 6-Core 2.6/4.4Ghz
• 16GB DDR4 2666MHz Memory
• Intel B560M mATX Motherboard
• OS Storage, Seagate Firecuda 120 SSD
• Test SSD connected to Secondary PCIe Gen 4 M.2 Slot

Here is the Video Review of the WD Black SN850X SSD and PC Benchmarks:

Using CrystalDisk, we got a good measure of the drive and verified that this PCIe Gen 4 x4 SSD was indeed using the 4×4 lane. Additionally, the temp averaged out around 48C between each test being conducted, with the drive being encased in a regular Eluteng M.2 $10 heatsink. Much like the WD Black SN850, this new entry into the WD Black series certainly ran quite hot.

The first tests were conducted using the ATTO disk benchmark software. The first was a 256MB test file size and below is a breakdown of the transfer rates and IOPS. The 2nd Test was a 1GB test file and finally, the last test was with a 4GB test file. The system was given 1-minute cool downtime between tests, no screen recording software was used (remove overhead) and a heatsink was used throughout (no reboots). Write performance continued to impress throughout, but the read performance was a pinch lower than expected, likely down to the i5 in the system compared with the Xeon/Ryzens that many Manf brands choose to max-benchmark their drives with

ATTO Disk Benchmark Test #1

256MB File PEAK Read Throughput  = 6.41GB/s

256MB File PEAK Write Throughput = 6.22GB/s

ATTO Disk Benchmark Test #2

1GB File PEAK Read Throughput  = 6.42GB/s

1GB File PEAK Write Throughput = 6.21GB/s

ATTO Disk Benchmark Test #3

4GB File PEAK Read Throughput  = 6.41GB/s

4GB File PEAK Write Throughput = 6.21GB/s

Next, although the ATTO tests were quite good, I moved on to the Crystal Disk Mark testing to see how well it would handle our next barrage of tests. The first test was the 1GB file testing, which measured both sequential and random, as well as the read and write IOPS. Test were conducted on a 1GB, 4GB and 16GB Test File. I also included a mixed 70/30 read and write task to give a little bit more of a realistic balanced workload. These tests were conducted with 1-minute cooling break in between. The WD Black SN850X did not crack the 7,000MB/s threshold on the mid-range test PC, but once again, the Write performance was very impressive indeed!

CRYSTALDISK MARK 1GB TEST

CRYSTALDISK MARK 4GB TEST

CRYSTALDISK MARK 16GB TEST

Next, I switched to AS SSD benchmark. A much more thorough test through, I used 1GB, 3GB and 5GB test files. Each test includes throughput benchmarks and IOPS that are respective to the larger file sizes (important, if you are reading this and trying to compare against the reported 4K IOPS from the manufacturer).

AS SSD Benchmark Test #1

AS SSD Benchmark Test #2

AS SSD Benchmark Test #3

Ordinarily, I would introduce tests like BlackMagic and AJA into the mix here, but even a short burst of testing on an NVMe like this would over saturate the cache memory on board. Nevertheless, in the short term we still could ascertain the reported performance on 1GB, 4GB and 16GB file testing was:

1GB AJA File Test Results (Peak) = 5894MB/s Read &5721MB/s Write

4GB AJA File Test Results (Peak) = 5861MB/s Read & 5759MB/s Write

16GB AJA File Test Results (Peak) = 6008MB/s Read & 5734MB/s Write

Overall, the WD Black SN850X was certainly able to provide some solid performance, as well as potentially exceed the test figures here on a more powerful machine. Given the reported Read and Write statistics that the brand has stated publically, I think there is enough evidence here to back up those claims. IOPs were a little lower than I expected, but again, we were testing very large file types, so this would have to be taken in context. I do wish most SSD brands provided benchmarks for different tiers of systems, rather than only stating the systems at the very, VERY top end. It makes sense, to run the drive in a system without any potential bottlenecks, but a 2nd or even 3rd round of test results that cover more mid-range or domestic systems would give users better scope of the drive’s potential in their own setup. Nevertheless, the peak performance of the WD Black SN850X was still exceptionally high AND sustained in my mid tier test machine and certainly a great indication that this drive will consistently live in the 6,500MB/s+ area in read/write in even the most modest setups.

AORUS NVMe Gen4 1TB

В другом углу у нас есть SSD AORUS нового поколения, который был представлен в этом 2019 году, емкостью 1 ТБ и 2 ТБ, что вдвое и в четыре раза больше, чем в предыдущем. Он также использует память Toshiba, хотя в этом случае модель BiCS4 с 96-слойной технологией NAND 3D TLC. Конкретно это будет 4 чипа, каждый из них по 256 ГБ. Для управления у нас есть новый контроллер Phison PS5016-E16, изготовленный в 28 нм, который способен обрабатывать 8 ТБ памяти в 8 каналах. Внутри находятся два 32-битных процессора ARM Cortex R5.

Частота последовательного чтения и последовательной записи для этого нового твердотельного накопителя составляет 5000 МБ / с и 4400 МБ / с соответственно. При этом количество операций ввода-вывода в секунду составляет 750 тыс. И 700 тыс. Соответственно.

WD Black SN850X SSD Review – Design

The WD Black SN850X SSD is a PCIe Gen 4×4 M.2 Key NVMe SSD that is completely backwards compatible with PCIe Gen 3×4 SSD slots where necessary (though crucially not M.2 SATA) that improves upon the architecture of the WD Black SN850 in a few key areas to produce a higher performance point in most of the key areas you want/need. Running on NVMe 1.4 architecture, the drive is reported to be the fastest PCIe m.2 SSD that Western Digital has ever produced and manages to saturate a maximum 7,300MB of the potential 8,000MB of PCIe 4×4 lanes.

The top of the SSD has the large ‘WD Black SN850X’ label that you do NOT need to remove when in operation (with or with a heatsink). Removing this label shows us a tightly packed arrangement of components/cells on the SSDs PCB. An SSD is not unlike a PC in it’s architecture, with a Controller (CPU), DRAM (Memory) and NAND (storage space). There are additional power/transistors in place to aid smooth operation, but ultimately these are the key components we need to focus on.

As mentioned earlier, if we flip the SSD over, we can see that this 2TB SSD is single-sided (i.e just a bare board on the back). The WD Black SN850X 4TB model IS double-sided, arriving with 4x 1TB NAND modules and an additional DDR4 Memory module, but this 2TB does an excellent job of keeping things nice and compact, whilst allowing much more direct, manageable and efficient heat dissipation. Something we will DEFINITELY touch on later.

The SN850X also benefits from being a completely first-party/in-house SSD. Many PCIe 4 SSDs that have arrived on the scene in the last two years can be broken down into two strict camps. The larger one is made up of brands such as Seagate, Sabrent, ADATA, Patriot and more who rely on 3rd party companies such as Phison and Innogrit to provide components (eg SSD controllers). The other smaller camp in the world of SSDs is comprised of brands such as Western Digital, Samsung and Crucial who tend to rely much more (often exclusively) on first-party controllers and NAND for their drives, allowing them to craft media that is much more precise in it’s execution, as well as allows them better quality control, supply and pricing. There are benefits to either approach in SSD design, but many users like the idea of a near complete or near enough completely in-house designed SSD.

So that is the physical design of the WD Black SN850X SSD. But what about the hardware components themselves? Does the WD Black SN850X SSD change things up much from the SN850? Let’s find out.

Review of the WD Black SN850X PCIe Gen 4 NVMe SSD

Before you sink your teeth into the review of the WD Black SN850X SSD, it is important to understand that this is not the same as the widely available and industry applauded SN850 SSD. On the face of it, the difference is simply the ‘X’ prefix – Is that really much of a difference? I think it would be pretty fair to say that when the PCIe 4 generation of SSDs hit the consumer market, the one that made the BIGGEST (and earliest) splash was the WD Black SN850. Originally released in Autumn 2020, although it wasn’t the first PCIe4 M.2 SSD, it WAS the first commercially available drive to hit 7,000MB/s (followed incredibly closely by Samsung’s 980 Pro). Now, 2020 was quite a while ago now (give or take a pandemic or two) and in that time a wide variety of top tier (and indeed mid-low tier) brands have expanded in the PCIe 4 SSD tier, challenging the WD Black SSD in terms of performance, durability and price. The 2020 released WD Black SN850, although still hot in the basket of buyers of PS5 storage and regularly on sale during Black Friday and the like, is no longer the groundbreaking drive that it once was. And THIS with where the WD Black SN850X comes in. Now, the SN850X is NOT designed to be a replacement to the SN850. In fact, in recent months, we saw Western Digital roll out the WD Black SN770, a DRAMless, more efficient and more affordable alternative. The SN850X is designed to complete the product family in the PCIe4 M.2 NVMe tier and whereas the SN850 gains notoriety and licencing with the Sony PS5, the WD Black SN850X has its sights squarely on the Premium PC Gamer and Premium Performance tier exclusively (content creators, professional streamers and eSports). But is the WD Black SN850X really that much different? Is this a cash grab or is this a legitimate answer by WD to challengers in the PCIe4 SSD tier? Let’s find out.

Note – Now that the WD Black SN850X SSD has been released, is the 2020 released WD Black SN850 SSD Still Worth Your Money in 2022/2023? Find out HERE on the blog or in 4mins HERE on YouTube, or the full performance test HERE.

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