WD Black SN770 500GB PCIe 4.0 NVMe SSD Review

Name: Western Digital Black SN770 500 GB
Brand: Western Digital
SKU: western-digital-black-sn770-500-gb
Rating: 3.7 (105 reviews)

Posted on May 17, 2026 by Raymond Chen

The WD Black SN770 500GB is the sweet spot of WD's budget Gen4 lineup, trading flagship features for a 5,000 MB/s read rating and a 5-year warranty.

WD Black SN770 500GB PCIe 4.0 NVMe SSD Review

Western Digital builds the SN770 around an in-house SanDisk-designed four-channel NVMe controller paired with BiCS5 112-layer Kioxia 3D TLC NAND. There is no onboard DRAM cache; the drive uses the NVMe Host Memory Buffer (HMB) feature to borrow a small slice of system RAM for its mapping table. The PCB is single-sided M.2 2280, which fits cleanly into thin-and-light laptops, mini PCs, and PS5-style heatsink carriers where bottom-side components would foul the slot. No heatsink is included in the retail box, and WD did not need to include one — the SN770 runs cool enough that motherboard-supplied cooling is plenty in nearly every install.

The SN770 is sold in 250 GB, 500 GB, 1 TB, and 2 TB capacities. The 500 GB tier sits a notch below the headline 1 TB and 2 TB ratings: WD spec sheets it at 5,000 MB/s sequential reads and 4,000 MB/s sequential writes, with 460,000 random read IOPS and 800,000 random write IOPS. Compared to the 250 GB sheet (4,000/2,000 MB/s) it is a substantial jump; compared to the 1 TB sheet (5,150/4,900 MB/s) it is a small step back, because there are fewer NAND dies to interleave. This is the smallest capacity that meaningfully feels like a Gen4 drive.

In this tier the SN770 500GB lines up directly against the WD Blue SN580 500GB, the Crucial P3 Plus 500GB, the Kingston NV2 500GB, and the Samsung 980 (PCIe 3.0). Among the DRAM-less Gen4 cohort, the SN770 has the most polished firmware, the longest warranty, and the most consistent random performance — the in-house controller is genuinely competitive. PS5 owners can use this drive in the console, but the 5,000 MB/s read rating sits a touch below Sony's 5,500 MB/s recommendation, so a 1 TB or 2 TB SN770 (5,150 MB/s) is a tidier match for that role.

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🚀 Performance and benchmarks

WD rates the 500 GB SN770 at up to 5,000 MB/s sequential reads and 4,000 MB/s sequential writes, with 460,000 random read IOPS and 800,000 random write IOPS. Those numbers comfortably outclass any SATA drive and roughly match a strong PCIe 3.0 NVMe on writes while delivering true Gen4 speeds on reads. Game loads, application launches, OS boot, and most DirectStorage workloads all feel sharp on this drive. Compared to a flagship like the WD Black SN850X, the gap shows up in queued mixed workloads and long sustained transfers, not in everyday desktop tasks.

Performance comparison

Western Digital Black SN770 500 GB vs M.2 4.0 x 4 peers

Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 4.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.

Patriot Viper PV593 1 TB: 14,500 MB/s read, 14,000 MB/s write
Patriot Viper PV593 2 TB: 14,500 MB/s read, 14,000 MB/s write
Patriot Viper PV593 4 TB: 14,500 MB/s read, 14,000 MB/s write
Patriot Viper PV573 2 TB: 14,000 MB/s read, 12,000 MB/s write
Western Digital Black SN770 500 GB (this drive): 5,000 MB/s read, 4,000 MB/s write

Like most TLC NVMe drives, the SN770 uses a dynamic SLC cache to absorb burst writes. Independent reviewers consistently find that the SLC cache on the 500 GB SN770 handles tens of gigabytes of writes at full speed before exhaustion, after which sustained writes drop into native TLC territory in the low gigabyte-per-second range. For users who copy a movie, install a game, or move a project folder, this transition is invisible. For users who routinely write 100 GB or more in one shot — large video archives, scratch disks, big game library migrations — the cache wall is something to plan around. The DRAM-less HMB design is the other practical trade-off: under deep mixed random workloads it lags DRAM-equipped drives like the Samsung 990 Pro, but for the buyer profile this drive is aimed at, the difference is academic.

🖥️ Endurance and warranty

Western Digital backs the SN770 with a 5-year limited warranty, and on the 500 GB capacity the endurance allowance is 300 TBW — half of the 1 TB model and double the 250 GB. That works out to roughly 165 GB of writes per day, every day, for five straight years before the rating is exhausted. A typical desktop or laptop user writes well under 50 GB per day, so the warranty time limit will expire long before any normal workload approaches the TBW ceiling. Power users running constant Steam reinstalls or video work should still keep an eye on SMART write counters, but for the target buyer this is a non-issue.

WD lists an MTBF of 1,750,000 hours for the SN770 family. MTBF is a population statistic, not a per-drive guarantee, so treat it as a sign of design confidence rather than a forecast. Warranty coverage is handled directly through Western Digital's support portal, which usually moves faster than a retailer return once the original purchase window has closed. As with every consumer SSD, the warranty ends at whichever boundary is reached first: five calendar years or 300 TBW.

📊 Specs

Category	Value
Capacity [?]	500 GB
Interface [?]	M.2 4.0 x 4
Controller [?]	SanDisk
Memory type [?]	Kioxia 112-L TLC
DRAM [?]	No (HMB)
Read speed (MB/s) [?]	5000
Write speed (MB/s) [?]	4000
Read IOPS [?]	460000
Write IOPS [?]	800000
Endurance (TBW) [?]	300
MTBF (million hours) [?]	1.75
Warranty (years) [?]	5

Conclusion

The WD Black SN770 500GB is the right pick for buyers who want a clean Gen4 boot drive and a second-tier game volume without paying for a flagship controller or DRAM. It is best suited to mainstream desktops, gaming laptops, mini PCs, and PCIe 3.0 upgrades that simply want to step into Gen4 territory. Heavy creators, PS5 owners chasing Sony's 5,500 MB/s read recommendation, and anyone planning sustained large-file workloads should look at the SN770 1 TB or 2 TB instead, where read speeds climb to 5,150 MB/s and endurance scales sharply. Among DRAM-less Gen4 rivals — Kingston NV2, Crucial P3 Plus, WD Blue SN580 — the SN770 500GB is the most consistent option backed by the longest warranty.

+ Pros

5,000 MB/s sequential reads on PCIe 4.0
300 TBW endurance with 5-year warranty
Single-sided M.2 2280 fits laptops and carriers
In-house SanDisk controller, BiCS5 Kioxia TLC
Strong 800,000 random write IOPS rating
Runs cool without an added heatsink

- Cons

4,000 MB/s writes trail the 1 TB SKU sharply
No DRAM hurts deep mixed random workloads
Just under PS5 5,500 MB/s read recommendation
Small SLC cache on the 500 GB die layout
No included heatsink in the retail box

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✨ Video Review

WD Black SN770 SSD Review – Mid Range Gaming Greatness?

⁉️ FAQ

Yes. The SN770 500GB is a competent gaming drive for the budget Gen4 tier. Its 5,000 MB/s read rating cuts asset streaming and level-load times down to near-flagship territory, and the 460,000 random read IOPS keep the OS and game launchers responsive. The 500 GB ceiling is the real limit — modern AAA titles routinely run 80–150 GB, so plan on holding two to four current games plus the OS. Buyers who want a primary game library and OS on a single Gen4 drive should step up to the 1 TB SN770 for more breathing room and faster writes.

The SN770 500GB physically fits the PS5 M.2 slot — it is a PCIe 4.0 NVMe drive in a single-sided 2280 form factor with a low-profile PCB. The catch is Sony recommends sustained read speeds of at least 5,500 MB/s, and the 500 GB SN770 is rated for 5,000 MB/s. The console will accept the drive and games will run, but Sony may flag it as below spec and you could see slightly longer load times on storage-heavy titles. For a Gen4 PS5 expansion, the SN770 1 TB at 5,150 MB/s clears the bar and is the cleaner pick.

No, the SN770 is a DRAM-less design. Instead of a dedicated DRAM chip on the PCB it uses the NVMe Host Memory Buffer (HMB) feature, which borrows roughly 32–64 MB of system RAM to hold the logical-to-physical mapping table. HMB works well for typical desktop and gaming workloads and lets WD hit a lower price point, but it does not match the consistency of a true DRAM cache under deep queue depths or sustained random work. DRAM-equipped alternatives such as the WD Black SN850X or Samsung 990 Pro hold up better in those niche scenarios.

The 500 GB SN770 is rated for 300 TBW (terabytes written) over its 5-year warranty period. The warranty ends at whichever comes first — five years on the calendar, or 300 TBW of host writes. In day-to-day terms, 300 TBW is roughly 165 GB of writes per day for five straight years, far beyond what a normal desktop, laptop, or gaming workload generates. The TBW figure scales with capacity across the family: 250 GB carries 200 TBW, 500 GB has 300 TBW, 1 TB has 600 TBW, and 2 TB has 1,200 TBW.

In most desktops and laptops, the SN770 500GB does not require an added heatsink. The DRAM-less in-house controller is relatively low-power, the single-sided PCB has fewer hot components than dense flagship drives, and motherboard-supplied M.2 covers are more than enough cooling for typical workloads. PS5 use is the one mandatory case — Sony requires a heatsink that keeps the assembly within 110 × 25 × 11.25 mm. A thin third-party heatsink also makes sense in laptops with poor M.2 airflow or in builds with heavy sustained writes.

Yes, by a meaningful margin. The 500 GB SN770 is rated at 5,000 MB/s sequential reads and 4,000 MB/s sequential writes, while the 1 TB version steps up to 5,150 MB/s reads and 4,900 MB/s writes. Random IOPS climb even more sharply, from 460,000/800,000 on the 500 GB to 740,000/800,000 on the 1 TB. The reason is NAND parallelism — bigger capacities have more flash dies running side by side. For most everyday tasks the difference is small, but in heavy mixed workloads or large file copies the 1 TB SKU pulls ahead.

The SN770 500GB and Crucial P3 Plus 500GB are direct rivals in the budget DRAM-less Gen4 tier. The P3 Plus is rated faster on the sequential read sheet (around 4,700 MB/s) but uses QLC NAND in many capacities, which makes its sustained writes drop sharply once the SLC cache fills. The SN770 sticks with TLC, has stronger random write IOPS, and ships with a 5-year warranty against Crucial's 5-year coverage. For a primary boot drive that needs to feel consistent, the SN770 500GB is the more dependable pick; the P3 Plus is a cheaper secondary or media drive.