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The 4TB M.2 Drive That Turns a Single PCIe Slot Into a High-Speed Storage Volume

Your server has an empty PCIe slot. You do not need a GPU. You do not need another NIC. You need fast, local NVMe storage that does not consume a front-panel drive bay. The Samsung 990 PRO 4TB in an M.2-to-PCIe adapter card (Supermicro AOC-SLG3-2M2 or equivalent) delivers 7,450 MB/s sequential read and 1,600K random read IOPS from a single PCIe 3.0 x4 slot — enough throughput to saturate the adapter, enough capacity to host a dozen VMs on local storage.

Technical Specifications

Parameter	Specification
Capacity	4TB (also: 1TB, 2TB)
Form Factor	M.2 2280 (80mm)
Interface	PCIe 4.0 x4, NVMe 2.0
NAND Type	Samsung V-NAND V8 (236-layer 3D TLC)
Controller	Samsung Pascal (in-house, 8nm process, nickel-coated heat spreader)
DRAM Cache	4 GB LPDDR4 (1 GB per 1 TB of NAND)
Sequential Read	Up to 7,450 MB/s
Sequential Write	Up to 6,900 MB/s
Random Read (4K, QD32)	Up to 1,600K IOPS
Random Write (4K, QD32)	Up to 1,550K IOPS
Endurance	2,400 TBW (4TB model), ~0.33 DWPD equivalent over 5 years
MTBF	1,500,000 hours
Power (Idle / Avg Read / Avg Write / Max)	0.055W / 5.5W / 6.3W / 7.8W
Thermal Throttling	Dynamic Thermal Guard — throttles at 82C. Nickel-coated controller spreads heat.
Security	AES-256 hardware encryption, TCG Opal 2.0, IEEE 1667, Microsoft eDrive
Physical	80.15 x 22.15 x 2.38 mm (M.2 2280), ~9g
Temperature	0C to 70C
Warranty	5-year limited (manufacturer), 2,400 TBW limit

Consumer SSD in a Server? When It Makes Sense (and When It Does Not)

Scenario	990 PRO 4TB	Enterprise SSD (PM9A3 3.84TB)	Verdict
Read-heavy cache (90+ percent reads, low write volume)	7,450 MB/s, 1,600K IOPS, $300	6,800 MB/s, 1,000K IOPS, $450	990 PRO wins on price-performance
Write-heavy logging (500 GB writes per day)	2,400 TBW total: exhausted in ~13 years at 500 GB/day	14,016 TBW: exhausted in ~77 years	Enterprise SSD wins on endurance confidence
VMware boot volume (OS only, read-mostly)	4TB, ~$75/TB. Overkill for boot but cheap enough.	3.84TB, ~$117/TB	990 PRO wins on cost per TB
Production database (mixed read-write, 2 DWPD)	Not rated for 2 DWPD sustained. 0.33 DWPD catastrophic.	1 DWPD, enterprise data path protection	Enterprise SSD. Never deploy consumer in production DB.
Edge server, 2-drive limit, cost-sensitive	4TB NVMe boot+data in one M.2 slot	U.2 requires NVMe backplane. M.2 enterprise options are more expensive.	990 PRO wins for edge cost sensitivity

Compatibility

M.2 2280 NVMe PCIe 4.0 x4. Requires M.2 slot or M.2-to-PCIe adapter. Compatible with Supermicro AOC-SLG3-2M2, ASUS Hyper M.2, and any M.2 NVMe-capable motherboard or adapter. Dell servers with M.2 slots: R470, R670, R770 support M.2 natively on specific motherboard revisions. Older Dell servers require adapter card.