WD Black SN770 2TB SSD Review - High-Capacity + Elite Performance

WD's Black SN770 1TB DRAMless proved to be Western Digital's best-performing SSD to date. Now let's see what the 2TB model can do.

@JonCoulterSSD
Published Fri, Feb 25 2022 8:08 AM CST
Rating: 100%Manufacturer: Western Digital (WDS200T3X0E)

Introduction & Drive Details

The last DRAMless SSD from Western Digital we reviewed, the 1TB WD Black SN770, turned out to be the most amazing SSD we've ever seen. This power-sipping, 4-channel DRAMless SSD changed everything we thought we knew about DRAMless SSDs. The PCIe Gen4 x4 interfaced SN770 defied all our preconceived notions about what the necessary ingredients for an Elite performing SSD had to be.

This drive clearly demonstrated that power-hungry, fire-breathing 8-channel controllers and expensive onboard DRAM are no longer required for hyper-class performance. In fact, the SN770 demonstrated that HMB (Host Memory Buffer) technology has become so efficient that we just might be witnessing the beginning of the end of onboard DRAM. After all, the SN770 is the overall most powerful consumer SSD WD has ever brought forth in terms of real-world performance. Just mind-blowing for a single package, 4-channel DRAMless SSD.

We should also point out that a huge part of the winning combination for the SN770 is the 512Gbit 112 Layer BiCS 5 flash it's arrayed with. BiCS 5 is true 4-plane flash and, as we've pointed out previously and provided it's managed by a controller running firmware that plays nice with it, is by far the best-performing flash currently adorning consumer SSDs.

We think so highly of the 1TB WD Black SN770 that we could not stand to wait for Western Digital to send over a 2TB review unit, so we bought our own. We need more of that DRAMless goodness. Now, we just assumed the 2TB model would be arrayed with two 1TB flash packages, and if so, despite WD's quoted performance specs, it might be even faster than the 1TB model. It turns out that's not the case. The 2TB model, like all others in WD's DRAMless stable, is arrayed with a single flash package.

2TB in a single flash package is something we've not seen before and is pretty amazing in its own right. But what that means is the 2TB model, just as it's spec'd by WD, will not be as fast as the 1TB model due to its 1024Gbit die composition. So, will it still be an Elite performer? That's what we want to know. Join us as we find out.

Drive Details

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We anticipated the 2TB model would need two flash packages to reach its capacity, but nope. The 2TB WD Black SN770 follows right along with what we've seen physically with Western Digital's DRAMless offerings for some time now. A single-sided 2280 PCB with a tiny SanDisk 4-channel controller upfront, some sort of coprocessor to the right of the controller, and a single flash package at the rear of the PCB.

Jon's Test System Specifications

Synthetic Benchmarks: CDM, Anvil, ATTO

CrystalDiskMark

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Testing with CDM reveals Western Digital's sequential throughput specs for the 2TB model to be pretty much spot on, if not a bit on the conservative side. In terms of sequential throughput, not much has changed by going to 1024Gbit flash. Random read performance, however, is down considerably compared with the 1TB model, which will have an impact on consumer workloads and gaming. This is what we expect to see whenever die capacity increases, so no surprises here.

Anvil's Storage Utilities

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Scoring here is down around 900 points compared with its 1TB sibling. Nevertheless, 9,000 points still lands our 2TB test subject in pretty good company, especially considering this is a DRAMless SSD.

Moving over to IOPS at QD128, we find the 2TB SN770 delivering a maximum IOPS of 620K, roughly 100K less than its 1TB sibling but still quite extraordinary for a DRAMless SSD.

ATTO

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As we've seen so far, higher capacity dies have little to no impact on sequential throughput. In fact, our 2TB test subject managed to best its 1TB sibling in 128K read throughput. Very nice.

Real-World Testing: Transfers, 3DMark SSD Gaming Test, PCM10 Storage

Transfer Rates

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The 2TB model continues to pretty much match its smaller sibling. Both are beating a bunch of 7,000 MB/s capable 8-channel SSDs. Impressive.

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It is quite impressive that the 2TB SN770 is the fastest of the Gen4 5,000 MB/s class SSDs, even outpacing several 8-channel drives with onboard DRAM and its smaller sibling to boot.

3DMark SSD Gaming Test

UL's newest 3DMark SSD Gaming Test is the most comprehensive SSD gaming test ever devised. We consider it superior to testing against games themselves because, as a trace, it is much more consistent than variations that will occur between runs on the actual game itself. This test is in fact the same as running the actual game, just without the inconsistencies inherent to application testing.

In short, we believe that this is the world's best way to test an SSDs gaming prowess and accurately compare it against competing SSDs. The 3DMark SSD Gaming Test measures and scores the following:

  • Loading Battlefield V from launch to the main menu.
  • Loading Call of Duty Black Ops 4 from launch to the main menu.
  • Loading Overwatch from launch to the main menu.
  • Recording a 1080p gameplay video at 60 FPS with OBS (Open Broadcaster Software) while playing Overwatch.
  • Installing The Outer Worlds from the Epic Games Launcher.
  • Saving game progress in The Outer Worlds.
  • Copying the Steam folder for Counter-Strike Global Offensive from an external SSD to the system drive.
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Gaming is a performance metric that matters to the majority of DIY consumers, especially to the enthusiast crowd that TweakTown caters to. We knew 1024Gbit flash would lower performance here. The question was, by how much? Roughly 10%, but even so, the 2TB SN770, despite its inherent handicaps, can outperform SSD the likes of Samsung's 2TB 980 Pro. Wow.

PCM10 Storage Tests

PCMark 10 Storage Test is the most advanced and most accurate real-world consumer storage test ever made. There are four different tests you can choose from; we run two of them.

The Full System Drive Benchmark and the Quick System Drive Benchmark. The Full System Drive Benchmark writes 204 GB of data over the duration of the test. The Quick System Drive Benchmark writes 23 GB of data over the duration of the test. These tests directly correlate with mainstream user experience.

PCMark 10 Full System Drive Benchmark

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This particular test writes 204GB data and covers a broad range of common consumer tasks, including booting Windows 10, file transfers, Adobe and Office applications, and startup times for games including Battlefield V, COD Black Ops 4, and Overwatch. Unlike synthetic numbers, this is comprehensive real-world data which is why we use it to rank SSDs in terms of user experience.

Roughly 9% less performance than its 1TB sibling. However, this performance hit is minimal in reality as the 2TB SN770, although slower than the 1TB model, is still among the fastest SSDs ever made. It's faster at heavy consumer workloads than most 7,400 MB/s Hyperclass SSDs, and that's with only one flash package and no onboard DRAM. Considering the 2TB model is made with 1024Gbit die, we find this to be an even more incredible accomplishment than we saw with the 512Gbit based 1TB model.

PCMark 10 Quick System Drive Benchmark

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Once again, a roughly 10% reduction in performance from 1TB to 2TB. But who cares? Look at where it lands on our chart. This is performance that matters.

Final Thoughts

Low power PCIe Gen4 x4 DRAMless SSDs are looking incredibly attractive at this point. By far, the best of this new class of value-centric hyper-performing SSDs is Western Digital's SN770. Overall, we deem it the most accomplished flash-based storage device ever made. Period, end of story. At 1TB, the WD Black SN770 is indeed the best performing SSD available in the Americas. At 2TB, its overall 9-10% slower than the 1TB model, but that still doesn't matter as we see it, based upon where it lands on the following chart:

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We rank SSDs in terms of overall user experience (performance where it matters most) as expressed by PCMark 10 storage and 3DMark gaming storage tests. We consider a user experience score of 11K or more to verify an SSD as a TweakTown Elite performer.

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For Western Digital to do this with 1024Gbit flash on a single package, mind you, is even more incredible than doing it with 512Gbit flash. The 2TB model is almost as fast as the 1TB model, our current performance champion for the Americas, but offers twice the capacity. Even though it's DRAMless with only 4-channels to work with, we find it to be the most desirable flash-based SSD money can buy. Western Digital's WD Black SN770 2TB is TweakTown Elite and worthy of our highest award.

Pros

  • Gaming
  • Consumer Workloads
  • Pricing

Cons

  • Not well suited for PS5
Buy at Amazon

Performance

100%

Quality

100%

Features

98%

Value

100%

Overall

100%

The Bottom Line

2TB of the most accomplished flash-based storage device ever made. You need this.

TweakTown award
100%

WD Black SN770 2TB NVMe PCIe Gen4 x4 M.2 SSD

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* Prices last scanned on 12/31/1969 at 6:00 pm CST - prices may not be accurate, click links above for the latest price. We may earn an affiliate commission.

Jon joined the TweakTown team in 2013 and has since reviewed 100s of new storage products. Jon became a computer enthusiast when Windows XP launched. He was into water cooling and benching ATI video cards with modded drivers. Jon has been building computers for others for more than 10 years. Jon became a storage enthusiast the day he first booted an Intel X25-M G1 80GB SSD. Look for Jon to bring consumer SSD reviews into the spotlight.

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