WD Black SN770 Review: Affordable Gen 4 SSD


While many of us are nonetheless the use of SATA SSDs, and a couple of even standard onerous drives, maximum desktop PCs and laptops at the moment are the use of PCIe NVMe era.

It provides the smallest shape issue, best speeds and bigger energy potency, and the fee top class isn’t as important because it as soon as used to be. To differentiate their merchandise, SSD makers have embraced the brand new Gen 4 same old for those units, developing extra value strata.

At the highest finish of this scale, we’ve merchandise just like the Seagate FireCuda 530, WD Black SN850 and Samsung 980 Pro all exceeding 7,000MB/s learn speeds on PCIe 4.0 M.2 slots.

That’s with regards to the theoretical restrict for this interface and highest for those who need to get the perfect functionality from an AMD Threadripper or Intel Twelfth-gen platform.

But now not everybody needs to pay for those final performers, and through turning down the flame just a little, some makers are providing serviceable answers that extra can have the funds for.

The new WD Black SN770 is this kind of choices, promising 5,000MB/s learn speeds for much less cash consistent with GB than the extra unique finish of the marketplace. Is this price bearing in mind, or must you stay your money for both a larger Gen 3 pressure or a smaller high-performance product?

Design & Build

As 2280 NVMe drives move, the type of SN770 is as generic as they arrive. On the highest aspect is the NAND package deal at the left and the controller is at the proper with a couple of discrete portions surrounding it.

The underside has no visual elements, this design comes and not using a heatsink, and WD has no choices the place one is integrated.

The WD Black SN770 comes with no heat spreader

Architecturally, the SN770 makes use of 112-layer TLC NAND flash blended with an in-house controller created through SanDisk, speaking to the host PC the use of NVMe 1.4 over a PCIe 4.0 bus.

The NVMe style at the present time is not to use DRAM to clean transfers however as an alternative use both SLC caching and, in terms of the SN770, RAM within the host PC as a buffer.

Not having a DRAM cache reduces price however affects on functionality, despite the fact that the level of this pace relief relies at the quantity of pressure house left to be dynamically used as an SLC cache and gear of the host methods reminiscence subsystem.

The SN770 isn’t the primary NVMe pressure I’ve observed with this configuration from Western Digital. It in the past used this means at the SN570, amongst different designs.

One snag with the host reminiscence buffer (HMB) means is that the Sony PS5 doesn’t enhance that era. That can be extra of an issue if Western Digital have been promoting the SN770 for this function, however it’s also underneath the 5,500MB/s low watermark for third-party modules at the PS5 anyway.

When Western Digital despatched my overview pattern, it used to be in particular discussed to not take a look at it in a PS5, and whilst it could paintings somehow, this isn’t one thing I’d counsel you do.

What I might suggest for all PC deployments is a third-party warmth spreader. While I didn’t come across thermal throttling in my exams, warding off any over the top build-up of warmth is more likely to lengthen the lifetime of the pressure and permit it to perform at the most productive conceivable speeds.


Depending on how you plan to make use of an SSDs, staying power is both one thing you might be all in favour of or now not. For those who hammer their pressure relentlessly, the SN770 is a mean performer when it comes to how a lot writing it will possibly deal with.

The 250GB pressure provides simply 200TB of TBW (Total Bytes Written), which will increase to 300TB for the 500GB choice. But those who paintings their SSDs onerous must imagine the 600- and 1200TBW staying power of the 1- and 2TB drives.

At related capacities, the TBW is lower than the Crucial MP600 LPX and Kingston KC3000, however taking the 1TB pressure for example, it’s on par with the Crucial P5 Plus, Samsung SSD 980 Pro and WD Black SN850.

My recommendation is unchanged in this matter, in that if TBW (Total Bytes Written) is doubtlessly a topic for you, then purchase the most important capability drives to raised distribute the workload between NAND cells.

An essential level in this matter is that important put on simplest happens when random writes occur, with a lot much less with sequential and reading in most cases. Therefore, when you write video recordsdata for example, that gained’t impart an identical quantity of wear and tear to NAND cells as random writes of small recordsdata.

TBW is normally calculated as being for the worst-case 4K random writes, and that’s now not how maximum customers utilise those drives, making the actual TBW for many customers a lot, a lot upper.

For a normal consumer that doesn’t write 500GB of random knowledge on a daily basis, TBW isn’t more likely to ever be an element, even at the smaller capability SN770. And, to underline its self assurance, Western Digital provides a five-year guaranty if the pressure doesn’t exceed quoted TBW over all the vary.

WD Black SN770 Benchmarked on CrystalDiskMark 8.0.4 Default Profile and 32GiB file size


The functionality on be offering within the SN770 is dictated, to some extent, through the capability selected.

If you want the most productive pace, I’d almost definitely keep away from the 250GB fashion. The makers quoted pace has it rated at 4,000MB/s sequential reads, and simply 2,000MB/s writes.

The 500GB choice has a a lot more first rate 5,000MB/s reads and 4,000Mb/s writes. But the 2TB pressure is going marginally sooner with 5,150MB/s reads and 4,850MB/s writes.

For unknown causes, the quickest SN770 is the 1TB fashion quoted with 4,900MB/s for sequential writes. My overview pattern used to be the 1TB pressure, and by the use of trying out, I will be able to verify those numbers via a slew of artificial exams.

The WD Dashboard allows Game Mode to be activated

But for complete transparency, one oddity with this SSD over others I’ve examined is this one has ‘Game Mode’. A distinct configuration that you’ll be able to turn on the use of the WD Dashboard utility on those drives.

I did some exams in Game Mode, and it didn’t be offering any dramatic growth over the traditional operations of the drives within the benchmarks I take advantage of. That’s to be anticipated as Game Mode, consistent with Western Digital, is supposed to fortify functionality with sport workloads, and artificial benchmarks don’t have the similar workload.

For this reason why, the entire benchmarks I’ll be citing had been executed with Game Mode disabled.

Using CrystalDiskMark 8.0.4, I noticed learn speeds of five,189MB/s and write of 4,909MB/s the use of the default profile and 32GiB report measurement. In a Real-World profile, the write pace used to be the similar however learn pace declined to five,086MB/s.

Running ATTO subsidized up the former research with top learn functionality of 4.19GB/s and writing at 4.62GB/s. Therefore, the headline ratings aren’t outstanding. It’s crushed through the Crucial P5 Plus, however the ratings are higher than a Gen 3 pressure of any selection can ship.

If the SN770 has a weak point, it’s that after the native RAM buffer and SLC cache are saturated, functionality has a tendency to fall off a cliff when the actual pace of the NAND is uncovered.

In my trying out, this ended in painful write speeds of round 550MB/s. But on a recent pressure, it took some really extensive write operation to succeed in this level, and maximum customers can be not likely to come across this decline till the pressure used to be extra closely occupied.

Typically SLC cache use of house takes 3 times that of standard garage, so in case you have 300GB of house left, the SLC cache will paintings smartly till you could have written 100GB. Once the write operation is whole, the cache written house is transformed into common use, and the prospective cache house is recovered.

This restoration occurs somewhat temporarily, and the pressure is able to settle for any other massive write afterwards.


As the SN770 used to be by no means going to be the quickest Gen4 SSD, it wanted a just right reason why to shop for, and that’s the fee.

Its MSRP in US bucks is $59.99, $79.99, $129.99, and $269.99 for the 250GB, 500GB, 1TB and 2TB fashions respectively. Online costs are decrease, and I discovered the 1TB SN770 on Best Buy and Amazon.com for only $114.99.

In the United Kingdom, the MSRP for the ones capacities is £56.99, £77.99, £134.99, and £269.99, and you’ll be able to purchase at those costs at once from the Western Digital store. You too can get it from the likes of Amazon, Scan, Box, Overclockers and (*4*).

That makes the 1TB pressure less expensive than the 500GB Seagate FireCuda 530, round $30 lower than the SN850 1TB and Samsung 980 Pro, and $40 wanting the Sabrent 1TB Rocket Plus.

In brief, this can be the most cost effective Gen 4 branded pressure through some margin. However, I want to indicate that probably the most competitor units enhance {hardware} encryption and feature better sustained functionality for those who write massive volumes of information.

Overall, the SN770 constitute just right worth and is surely a better choice than buying an end-of-line Gen3 design.

If you are now not certain which SSD to shop for, test our highest SSDs chart with a variety of choices and purchasing recommendation.


The first essential factor to know in regards to the SN770 is that it replaces the getting older SN750, a Gen 3 pressure that peaked at reading speeds of three,400MB/s and writes of three,100MB/s.

In comparability, the SN770 is a dramatically higher proposition, even for the ones nonetheless the use of Gen 3 slots than the SN750. It provides significantly better energy potency, making it helpful for computer customers.

The simplest unhappiness is that the SN750 had a 4TB fashion, and that choice is lacking from the SN770 vary. WD padded out the fashions with a 250GB choice of doubtful worth that, consistent with the legit numbers, isn’t price bearing in mind.

While the 500GB fashion is much less kneecapped, it’s the 1- and 2TB variations that bask within the functionality and worth sunshine, and I’d counsel the ones.

Where this pressure appears much less engaging is for the ones operating mission-critical workouts the place functionality is the entirety. It isn’t the fastest Gen 4 pressure, and it will possibly’t maintain its writing speeds over the lengthy haul.

But, briefly sprints, like when video games are introduced, it’s advantageous. The simplest mistake that Western Digital made used to be to permit the functionality to drop underneath the appropriate degree to be PS5 licensed, ruling out a whole segment of conceivable patrons.

For PC players, the WD Black SN770 is price bearing in mind for the ones operating to the cheap. It delivers enough pace to release titles temporarily, nevertheless it prices about 40% lower than the flagship branded designs. Even when you issue purchasing a third-party warmth spreader, it nonetheless represents a just right deal.

If you wish to have the quickest pressure conceivable, then you definitely gained’t get it at this value, however when you simply need an inexpensive workhorse gaming SSD, then the SN770 is a reputable selection.


WD Black SN770: Specs

  • Capacities: 250GB, 500GB, 1TB and 2TB
  • Colour: Black
  • Controller: WD in home through SanDisk
  • Flash Memory: 112-layer TLC NAND
  • Dimensions: (L x W x H): 80 x 22 x 2.38mm
  • Weight: 5.5g
  • Interface: M.2 NVMe PCI slot (PCIe Gen4, downgradable to Gen3, Gen2 and Gen1)
  • Quoted Sequential Read (500GB, 1TB, 2TB,4TB): 4,000MB/s, 5,000MB/s, 5,150MB/s and 5,150MB/s MB/s
  • Quoted Sequential Write (500GB, 1TB, 2TB,4TB): 2,000MB/s, 4,000MB/s, 4,900MB/s and 4,850MB/s MB/s
  • Quoted Random Read/Write IOPS (500GB, 1TB, 2TB,4TB): 240K/480K, 460K/800K, 740K/800K and 650K/800K
  • Total Bytes Written (250GB, 500GB, 1TB, 2TB): 200TB, 300TB, 600TB and 1,200TB.
    Warranty: 5 years


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