WD

WD Ultrastar DC SN655 3.84TB U.3

WUS5EA138ESP7E1
Ultrastar DC SN655oltpTLC3.84TBNVMe-PCIe4U.3
$208.07/TB
$799.00
newNot available
Price updated
Price accurate as of Sep 14, 2026, 01:30 PM
No current offer

The WD Ultrastar DC SN655 3.84TB U.3 is a 3.84TB NVMe-PCIe4 SSD in new condition. It has no current offer on Amazon; the in-stock alternatives nearest its capacity are listed below.

In stock instead - nearest to 3.84TB

6 in-stock listings · this listing has no current offer on Amazon · ranked by live cost per tb, refreshed every few hours

DriveCapacityCondition$/TBPrice
Micron 7400 PRO 3.84TB U.3
MTFDKCB3T8TDZ
3.84TBREFURB$182.87$702Buy/View Price
Dell 3.84TB SAS SSD Read Intensive 12G
MZILT3T8HBLS
3.84TBREFURB$208.33$800Buy/View Price
Micron 7450 PRO 3.84TB U.3
MTFDKCC3T8TFS
3.84TBREFURB$518.23$1990Buy/View Price
Kioxia CD8 Series 3.84TB NVMe U.2
KCD8XVUG3T84
3.84TBNEW$656.51$2521Buy/View Price
Micron 7600 PRO 3.84TB U.2 PCIe5
MTFDLAL3T8THG
3.84TBNEW$676.82$2599Buy/View Price
Samsung PM9A3 3.84TB U.2 NVMe
MZQL23T8HCLS
3.84TBREFURB$911.46$3500Buy/View Price
Before you buy: check the bay and the lanes

U.2 and U.3 drives need a backplane wired for NVMe or an adapter carrying PCIe lanes to the bay - a SAS backplane will not do it. Check your chassis supports NVMe in the slot you plan to use before ordering. NVMe drive prices and form factors

Same capacity, other options
DriveInterfaceCond$/TBPrice
Micron 7400 PRO 3.84TB U.3NVMe-PCIe4Refurb$182.87$702.22Buy
Dell 3.84TB SAS SSD Read Intensive 12GSAS-12GRefurb$208.33$799.99Buy
Micron 7450 PRO 3.84TB U.3NVMe-PCIe4Refurb$518.23$1990.00Buy
Kioxia CD8 Series 3.84TB NVMe U.2NVMe-PCIe4New$656.51$2521.00Buy
Model context

Part of the WD line we track.

Quick Verdict

The WD Ultrastar DC SN655 3.84TB U.3 delivers enterprise NVMe performance at $208.07/TB. Suited to read-intensive cloud workloads and mixed enterprise applications. Verify U.2/U.3 backplane compatibility before ordering.

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Specifications

Capacity3.84TB
Form FactorU.3
InterfaceNVMe-PCIe4
Recording TechTLC
Sector Size
Workload Rating
DWPD
TBW7008TB
Warranty5 years
ASINB0CP67QYTF
Market context

We do not have enough in-stock comparators of this type today to place this price against the rest of the market. The category page below ranks everything we do have.

Where the wider market has moved

These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.

Compare against every 3.84TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 3.84TB NVMe-PCIe4
#1Samsung PM9A3 3.84TB E1.S NVMe
$138.02/TB
#2Samsung PM9A3 3.84TB U.2 NVMe
$166.41/TB
#3Samsung PM9A3 3.84TB U.2 NVMe
$169.01/TB
#4Micron 7400 PRO 3.84TB U.3
$182.87/TB
#5Micron 7400 PRO 3.84TB U.3
$194.01/TB

Frequently Asked Questions

The Ultrastar DC SN655 3.84TB U.3 is designed for mixed enterprise workloads including virtualization, databases and analytics.

The Ultrastar DC SN655 3.84TB U.3 uses a U.3 form factor with NVMe-PCIe4 interface. Compatible with servers featuring U.2 or U.3 backplanes including Dell PowerEdge, HPE ProLiant Gen10+, and Supermicro with appropriate NVMe backplane.

Endurance is measured in DWPD (Drive Writes Per Day). Check the manufacturer datasheet for this drive's specific endurance rating.

Use Case Scenarios

🗄️
OLTP Database Primary Storage
PostgreSQL, MySQL or Oracle requiring low latency and high IOPS.
✓ Excellent fit
NVMe delivers sub-200μs latency vs 5ms for HDD — a 25x improvement that directly reduces query response times. At 1 DWPD verify your daily write volume stays within endurance limits.
🤖
AI/ML Training & Inference
GPU server loading training datasets or serving inference at high throughput.
✓ Excellent fit
NVMe at 6,900MB/s eliminates storage bottlenecks when loading datasets to GPU memory. Consider multiple drives for larger datasets.
💾
Bulk Cold Data Archive
Storing large volumes of infrequently accessed data.
✗ Not ideal
At ~$208/TB, NVMe costs 10x more than enterprise HDD for cold data. Unless you need fast retrieval, HDDs or LTO tape are far more cost-effective.

Maintenance & Troubleshooting

Maintenance Checklist

On installUpdate drive firmware
Check manufacturer website for latest firmware. Enterprise SSDs receive updates that fix performance and reliability issues.
On installEnable power loss protection verification
Enterprise NVMe drives have onboard capacitors for power loss protection. Verify in drive logs after first power cycle.
MonthlyCheck SMART/NVMe health attributes
Run nvme smart-log /dev/nvme0 (Linux). Monitor: Media_Errors, Available_Spare, Percentage_Used.
MonthlyMonitor write endurance consumption
Track Percentage_Used SMART attribute. At 80%+ consider planning replacement. At 3.84TB and 1 DWPD you have 7,176,192GB lifetime writes.
QuarterlyReview error logs in server BMC
Check iDRAC, iLO or IPMI logs for NVMe errors, PCIe link speed downgrades, or unexpected resets.

Troubleshooting Guide

Cause: PCIe slot not initialized, missing NVMe driver, BIOS not updated, or U.2 cable issue.
Fix: Check BIOS for NVMe in PCIe enumeration. Update server firmware. Reseat U.2 cable. Verify PCIe bifurcation if using adapter. Test in another slot.