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WD Black SN770 NVMe SSD vs WD_BLACK SN850X 1TB NVMe SSD with Heatsink

The SN850X is the faster drive and the one to buy for a new PCIe 4.0 build or a PS5, where its heatsink and higher sequential and random speeds pay off. The SN770 is the smarter pick for older laptops, PCIe 3.0 systems and tight budgets, since it runs cooler, comes in a shorter M.2 2230 size, and still feels quick in games. Owners rate both highly; the SN850X edges ahead on sustained writes and thermals, while the SN770 wins on efficiency and fit.

  • Choose the WD Black SN770 if you have a PCIe 3.0 slot, a compact M.2 2230 bay, or want a cool-running drive that still loads games fast.
  • Choose the WD_BLACK SN850X with heatsink if you have a PCIe 4.0 desktop or a PS5 and want the highest speeds and steadier performance under long writes.

Prices

  • WD Black SN770 NVMe SSD: $65.00 at Walmart (checked today)
  • WD_BLACK SN850X 1TB NVMe SSD with Heatsink: $147.44 at Stockyfy.com (last seen Nov 8)
  • Difference: the WD Black SN770 NVMe SSD is $82.44 cheaper than the WD_BLACK SN850X 1TB NVMe SSD with Heatsink at the latest prices (Nov 8 and Nov 10)
Western Digital
WD Black 1TB SN770 NVMe Internal Gaming SSD

WD Black SN770 NVMe SSD

WD Black 1TB SN770 NVMe Internal Gaming SSD

4.6(924 ratings)
$65.00at WalmartChecked 13 h ago
See all prices and details
Visit Walmart
Pros
  • Fast Gen4 reads at a lower power draw
  • Fits M.2 2230 slots in compact laptops and handhelds
  • Single-sided design suits thin devices
  • Backward compatible with PCIe Gen3
  • Well rated by owners
Cons
  • No heatsink, so sustained writes can slow on hot systems
  • Slower than the SN850X on large file transfers
  • No hardware encryption listed
WD BLACK
WD_BLACK 1TB SN850X NVMe SSD with Heatsink

WD_BLACK SN850X 1TB NVMe SSD with Heatsink

WD_BLACK 1TB SN850X NVMe SSD with Heatsink

4.7(611 ratings)
$147.44at Stockyfy.comChecked Nov 8
See all prices and details
Visit Stockyfy.com
Pros
  • Top-tier Gen4 speeds near the interface limit
  • Heatsink keeps performance steady under load
  • High random write IOPS for game installs and updates
  • Game Mode 2.0 and RGB control in the Dashboard
  • Available up to 8TB
Cons
  • Heatsink version needs clearance and may not fit laptops or some PS5 setups without the cover
  • Runs hotter and draws more power
  • 2280 length only, so no 2230 fit

What separates them

WD Black SN770 NVMe SSDWD_BLACK SN850X 1TB NVMe SSD with Heatsink
Sequential readUp to 5,150 MB/sUp to 7,300 MB/s
Sequential writeUp to 4,900 MB/sUp to 6,300 MB/s
Random 4KB IOPSNot published for this model800K read / 1.1M write
HeatsinkNone; single-sided bare driveIntegrated heatsink version
Form factorsM.2 2280 and shorter M.2 2230M.2 2280 only
Power and heatLower power draw, runs cooler in laptopsRuns hotter; heatsink helps sustain speed
Game softwareWD_BLACK Dashboard with gaming modeDashboard plus Game Mode 2.0 and RGB control
Hardware encryptionNo 256-bit AESNot listed as a feature

Price history

$424.99$99.99
Oct 30Nov 10
  • WD Black SN770 NVMe SSD: lowest $99.99 on Nov 7 at Best Buy; $99.99 on Nov 9.
  • WD_BLACK SN850X 1TB NVMe SSD with Heatsink: lowest $147.44 on Nov 9 at Stockyfy.com; $259.87 on Nov 10.

Prices at every store

WD Black SN770 NVMe SSD

  • WalmartNew

    In stockSold by Daily Spirit DealsReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $65.00Free shippingChecked 13 h ago
    Visit Walmart
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $249.99Checked Oct 30
    Visit Amazon
  • eBayNew

    Availability unknownSold by r1gallery (99% positive, 790 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $250.00Free shippingChecked Nov 9
    Visit eBay
  • Best BuyNew

    Out of stock

    $99.99Free shippingChecked Nov 9
    Visit Best Buy

Store links may earn us a commission. Some prices via Klarna.

All 5 stores and price history →

WD_BLACK SN850X 1TB NVMe SSD with Heatsink

  • Stockyfy.comNew

    In stock

    $147.44Free shippingChecked Nov 8
    Visit Stockyfy.com
  • NeweggNew

    In stock

    $259.87+ $29.99 shippingChecked 2 h ago
    Visit Newegg
  • WalmartNew

    In stockSold by Altius TechnologiesReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $334.49Checked 2 h ago
    Visit Walmart
  • eBayNew

    Availability unknownSold by disa.i_57 (100% positive, 13 ratings)Ships from Germany · duties may applyReturns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $222.86+ $18.94 shippingChecked Nov 8
    Visit eBay

Store links may earn us a commission. Some prices via Klarna.

All 7 stores and price history →

Specs compared

SpecWD Black SN770 NVMe SSDWD_BLACK SN850X 1TB NVMe SSD with Heatsink
hard_drive_capacity1 TB1 TB
colorBlackMulticolor
sizeNone1
TypeNVMe SSDSSD
InterfaceNVMePCIe Gen4 x4 NVMe
Form FactorM.2 2230, M.2 2280M.2
UseInternal—
Device CompatibilityPC—
Wireless ConnectivityNo—
DurabilityNot crush-proof—
Read Speed5150 MB/s (1TB and 2TB models)—
Write Speed4,900 MBps—
Show all 33 specsShow fewer specs
SpecWD Black SN770 NVMe SSDWD_BLACK SN850X 1TB NVMe SSD with Heatsink
NVMe SupportYes—
PCIe SupportYes—
CachenCache 4.0 Technology—
Data EncryptionNo 256-bit AES hardware-based encryption—
Design HighlightsSingle-sided—
Typical UsersGamers—
RemovableNo—
shape—SSD w/ Heatsink
M.2 Form Factor—2280
Wi-Fi

What reviewers say

WD Black SN770 NVMe SSD

  • 4.6 / 5924 ratings

Owners rate the SN770 highly, calling it a fast, reliable Gen4 drive for the money. Most praise comes from gamers and laptop upgraders who see big load-time drops. Complaints center on sustained write speed and the lack of DRAM.

What people mention
  • SpeedPraisedOwners say games and apps load much faster than on SATA or Gen3 drives.
  • ValuePraisedBuyers call it one of the better price-to-performance Gen4 drives.
  • Sustained writesMixedLarge transfers can slow once the cache fills, though everyday use feels fast.
  • DRAM cacheCriticisedSome owners note the lack of DRAM and hardware encryption versus premium drives.

WD_BLACK SN850X 1TB NVMe SSD with Heatsink

  • 4.7 / 5611 ratings

Owners rate it highly, with 4.7 out of 5 from 611 ratings. Most praise the fast load times and the heatsink keeping performance steady in a PS5 and in gaming PCs. A few mention heat and fit as the main drawbacks.

What people mention
  • SpeedPraisedOwners say games and large files load noticeably faster than on older SATA or Gen3 drives.
  • HeatsinkPraisedBuyers like that the included heatsink keeps performance steady during long gaming sessions.
  • HeatMixedSome note the drive runs warm, though the heatsink helps in most setups.
  • FitMixed

Questions and answers

Which is better for a PS5?
The SN850X with heatsink. Sony requires a heatsink for added M.2 drives, and the SN850X meets the speed requirement with room to spare. The SN770 works but needs a separate heatsink.
Is the SN850X worth stepping up to over the SN770?
Yes on a PCIe 4.0 desktop or PS5, where you get roughly 40% more sequential read speed, much higher random write IOPS and a heatsink. On a PCIe 3.0 laptop the SN770 already saturates the slot, so the extra speed goes unused.
Which runs cooler?
The SN770. It draws less power and is single-sided, which suits laptops and handhelds. The SN850X runs hotter, and its heatsink exists to keep it from throttling during long writes.
Will either fit my laptop?
Check the slot length. The SN770 comes in M.2 2230 and 2280, so it fits short bays. The SN850X is 2280 only, and the heatsink version is too tall for most laptops.
Which lasts longer?
Both use TLC NAND and carry multi-year warranties, and neither publishes a clear endurance edge at 1TB. The SN850X is built for heavier sustained writes; the SN770's lower heat is gentler on tight enclosures.
Do both work with the WD_BLACK Dashboard?
Yes. Both support drive health monitoring, but only the SN850X unlocks Game Mode 2.0 and RGB lighting control.

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Buying guides that pick them

  • Best 1TB NVMe SSDs
—
No
External Connection—USB-A
Depth (")—3.1
Width (")—0.9
Weight (oz)—0.8
Placement—Internal
Size (GB)—1000
Height (")—0.3
Random Write 4KB (max) (IOPS)—1100000
Sequential Write (MB/s)—6300
Sequential Read (MB/s)—7300
Random Read 4KB (max) (IOPS)—800000
A few say the heatsink version is too thick for tight laptop or slim slots.