# Intel Optane DC P5800X 400GB — The Fastest SSD Ever Made (2026)

The Intel Optane DC P5800X 400GB is the highest-performance solid-state drive ever produced, pairing second-generation Optane persistent memory with a PCIe 4.0 interface for 7,400 MB/s symmetric throughput and an extraordinary 100 drive-writes-per-day endurance rating.

Quick answer: The Intel Optane DC P5800X 400 GB is a category-defying product that has no direct successor and no true peer. It combines PCIe 4.0 interface speeds with Optane's unmatched low-queue-depth random performance and an endurance rating that makes even the most durable NAND drives look disposable. It is also a dead-end product: Intel discontinued Optane media production in 2022, and while Solidigm (SK Hynix) continues to sell remaining inventory and provide support, no future Optane SSDs will be manufactured. For the workloads that justify its cost — latency-sensitive financial trading, write-intensive database logging, high-endurance caching tiers — the P5800X remains the best SSD ever made and is likely to hold that title for years after it disappears from the market. For everyone else, a high-end NAND NVMe drive like the Samsung 990 PRO or Solidigm P44 Pro delivers far more capacity per dollar and performance that is already overkill for consumer and prosumer workloads. The P5800X is not a product you buy; it is a product you deploy to solve a specific, expensive performance or endurance problem that NAND cannot address.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 400 GB |
| Interface | U.2 2.5" or E1.S |
| Controller | Intel |
| Memory type | Intel Optane 2nd Gen |
| DRAM cache | No |
| Sequential read | 7400 MB/s |
| Sequential write | 7400 MB/s |
| Random read IOPS | 1550000 |
| Random write IOPS | 1600000 |
| Endurance | 73000 TBW |
| MTBF | 2 |
| Warranty | 5 years |

## Performance

The P5800X 400 GB delivers a performance profile that no NAND-based SSD can approach, particularly at the low queue depths that characterise real-world workloads. Sequential throughput saturates the PCIe 4.0 x4 interface in both directions at 7,400 MB/s, and unlike NAND drives where writes are only fast inside the pSLC cache, the P5800X maintains full write speed indefinitely — there is no cache, no folding, and no write cliff. A full-drive sequential write of the entire 400 GB completes at 7,400 MB/s from start to finish, a feat that no NAND SSD of any generation can match.

The defining characteristic, however, is random performance at low queue depths. The P5800X delivers approximately 450,000–500,000 random 4K read IOPS at QD1 — nearly an order of magnitude more than the ~15,000–20,000 IOPS that the best NAND SSDs manage at the same queue depth. Random 4K write at QD1 is similarly dominant at 350,000–400,000 IOPS versus ~50,000–60,000 IOPS for a top-tier NAND drive. This low-QD dominance is what makes Optane transformative for real-world server and workstation workloads: databases, virtualisation, and software compilation are all dominated by small, scattered I/O at low queue depths where NAND controllers cannot hide their media latency behind parallelism. The P5800X's 4K random read latency is approximately 5–7 microseconds, compared to 50–80 microseconds for a fast NAND SSD and roughly 0.1 microseconds for DRAM. It occupies a unique position roughly 50–100x slower than DRAM but 10–20x faster than NAND, with persistence that DRAM lacks.

Thermally, the P5800X is a 15 mm U.2 device designed for server chassis with forced airflow. The 18–21 W power draw under full load requires active cooling in most environments; the drive incorporates thermal throttling that engages at 85 °C, but a well-ventilated server chassis or a U.2-to-PCIe adapter card with a heatsink keeps the drive in the 50–65 °C range under sustained load.

## Endurance, TBW & Warranty

Intel warrants the DC P5800X 400 GB for 5 years, with an endurance rating of 100 drive writes per day (DWPD) under a random 4K write workload. This translates to 40 TB of writes per day, or approximately 73,000 TBW over the 5-year warranty period. For context, the highest-endurance consumer NVMe drive on the market — a 2 TB Phison E16 TLC drive like the Sabrent Rocket 4.0 — carries 3,600 TBW total. The P5800X 400 GB, despite having one-fifth the capacity, offers roughly 20 times the total write endurance. This endurance is made possible by Optane's fundamentally different physics: 3D XPoint media does not require the erase-before-write cycle that wears out NAND cells, and writes are performed in-place by changing the resistance state of the storage material, which causes negligible wear compared to the charge-trap or floating-gate programming of NAND. Intel's warranty and support for the P5800X are enterprise-grade, with advance replacement options and technical support channels that differ from Intel's consumer SSD programme. The Solidigm transition following SK Hynix's acquisition of the Optane business may affect long-term warranty service, and enterprise buyers should confirm current support channels with their distributor.

## Pros and Cons

**Pros:**

- Fastest SSD ever made — no NAND drive comes close
- 7,400 MB/s symmetric read/write, sustained indefinitely
- 100 DWPD endurance — 73,000 TBW over 5 years
- ~5–7 μs random 4K latency vs. 50–80 μs for NAND
- 450K+ random read IOPS at QD1 — 10x NAND SSDs
- No write cliff, no cache, no folding — Optane is different
**Cons:**

- Extremely expensive — ~$3–4/GB at launch
- U.2 form factor requires compatible hardware (not M.2)
- 400 GB capacity is small for consumer use
- 18–21 W power draw requires active cooling
- Optane discontinued — no future products or long-term supply
- Enterprise support channels required for warranty service


## Verdict

The Intel Optane DC P5800X 400 GB is a category-defying product that has no direct successor and no true peer. It combines PCIe 4.0 interface speeds with Optane's unmatched low-queue-depth random performance and an endurance rating that makes even the most durable NAND drives look disposable. It is also a dead-end product: Intel discontinued Optane media production in 2022, and while Solidigm (SK Hynix) continues to sell remaining inventory and provide support, no future Optane SSDs will be manufactured. For the workloads that justify its cost — latency-sensitive financial trading, write-intensive database logging, high-endurance caching tiers — the P5800X remains the best SSD ever made and is likely to hold that title for years after it disappears from the market. For everyone else, a high-end NAND NVMe drive like the Samsung 990 PRO or Solidigm P44 Pro delivers far more capacity per dollar and performance that is already overkill for consumer and prosumer workloads. The P5800X is not a product you buy; it is a product you deploy to solve a specific, expensive performance or endurance problem that NAND cannot address.

## Frequently Asked Questions

### What is Intel Optane and how is it different from NAND?

Intel Optane is a brand name for 3D XPoint (pronounced 'cross-point'), a non-volatile persistent memory technology co-developed by Intel and Micron. Unlike NAND flash, which stores data as electrical charges in floating-gate or charge-trap cells, 3D XPoint stores data by changing the electrical resistance of a chalcogenide glass material. The key differences: Optane is bit-addressable at the hardware level (NAND is page/block-based), Optane supports in-place writes without requiring an erase cycle first (NAND requires erasing an entire block before rewriting any page within it), and Optane's read/write latency is roughly 10–20x lower than NAND. These properties give Optane its defining advantages: symmetric read/write throughput, near-DRAM latency at low queue depths, and extreme write endurance. The trade-offs are cost (roughly 10x NAND per gigabyte), capacity density (NAND scales to much higher capacities per die), and power consumption.

### What is DWPD and how does 100 DWPD compare to NAND SSDs?

DWPD (drive writes per day) measures how many times the full capacity of the drive can be overwritten every day for the duration of the warranty. The P5800X 400 GB is rated at 100 DWPD, meaning it can sustain 40 TB of writes daily for 5 years — roughly 73,000 TBW total. By comparison, a high-endurance consumer NAND SSD like the Sabrent Rocket 4.0 2 TB carries 3,600 TBW (about 1 DWPD), and a premium consumer drive like the Samsung 990 PRO 2 TB carries 1,200 TBW (about 0.33 DWPD). Enterprise NAND SSDs typically rate at 1–10 DWPD. The P5800X's 100 DWPD is two orders of magnitude more endurance than a consumer NAND drive and 10–100x more than an enterprise NAND drive. The endurance comes from Optane's in-place write capability: because writes do not require a preceding erase cycle, there is no write amplification from garbage collection, and the media itself experiences negligible wear per write cycle.

### Can the P5800X 400GB be used in a desktop PC?

Yes, but with significant caveats. The P5800X uses a U.2 (SFF-8639) connector, not M.2, so it requires either a motherboard with a native U.2 port (rare on consumer boards), a U.2-to-M.2 adapter cable (which connects the drive's U.2 port to an M.2 slot), or a PCIe add-in card that accepts U.2 drives. The drive is 15 mm thick and will not fit in laptop drive bays. Power consumption of 18–21 W under load means it needs active airflow — a fanless desktop with poor case ventilation will see the drive thermal-throttle. For a consumer desktop, a U.2-to-PCIe adapter card in a well-ventilated case is the most practical installation method. However, the 400 GB capacity is small by consumer standards, and the performance benefits of Optane over a fast NAND NVMe drive are negligible for gaming, web browsing, and general productivity. The P5800X makes sense in a desktop only for specialised workstation use cases: compiling large codebases, running local databases with heavy write loads, or as a high-endurance scratch disk for professional content creation.

### Why was Intel Optane discontinued?

Intel announced the winding-down of its Optane business in July 2021 as part of a broader restructuring under CEO Pat Gelsinger. The Optane business was sold to SK Hynix, which formed a subsidiary called Solidigm to manage the remaining Optane inventory and support. 3D XPoint production at Micron's Lehi, Utah fab (the only facility that manufactured the media) ceased in 2022. The reasons were primarily economic: 3D XPoint was extremely expensive to manufacture compared to NAND, the market for ultra-premium storage was smaller than Intel projected, and competing technologies (high-end enterprise NAND SSDs with computational storage, CXL-attached memory, and faster NAND interfaces) eroded Optane's unique value proposition for all but the most latency-sensitive and write-intensive workloads. The P5800X is now a collector's item as much as a storage product — the last and fastest of its kind, with no successor planned by any manufacturer.

### How does the P5800X compare to the fastest NAND SSDs like the Samsung 990 PRO?

The comparison is not straightforward because the products serve different markets, but the performance gaps are instructive. Sequential throughput is close — the 990 PRO delivers 7,450/6,900 MB/s versus the P5800X's 7,400/7,400 MB/s — but the P5800X's write speed is fully sustained while the 990 PRO's write speed drops sharply once its pSLC cache is exhausted. Random 4K at QD1 is where Optane dominates: the P5800X delivers ~450,000 read IOPS and ~350,000 write IOPS, versus the 990 PRO's ~18,000 read and ~55,000 write IOPS — a 25x read advantage and 6x write advantage for Optane. Latency is similarly lopsided: ~6 μs for P5800X versus ~50–80 μs for the 990 PRO. Endurance is the largest gap: 73,000 TBW versus 1,200 TBW. However, the 990 PRO costs roughly $0.08/GB at 2 TB, while the P5800X cost roughly $3–4/GB at launch. For consumer workloads, the 990 PRO is the better product. For the enterprise workloads Optane was designed for, the 990 PRO is not in the same conversation.

### Is the P5800X suitable for a home lab or NAS?

The P5800X can be used in a home lab or NAS, but the value proposition is narrow. The drive's strengths — extreme low-queue-depth random performance and 100 DWPD endurance — are most relevant as a write cache (SLOG/ZIL for ZFS, bcache, or LVM cache) in front of a larger NAND or HDD storage pool, or as a dedicated database volume for workloads like PostgreSQL, MySQL, or Elasticsearch. The 400 GB capacity is well-matched to these caching and logging roles. For a home NAS serving media files and backups, a consumer NAND NVMe drive provides far more capacity per dollar and the Optane performance and endurance advantages are irrelevant. Installation in a home lab requires the same U.2 connectivity considerations as desktop use, plus server-grade cooling. Used P5800X drives occasionally appear on the secondary market at significant discounts to the original MSRP, which is the most realistic acquisition path for home-lab enthusiasts.

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Last updated: 2026-05-23. Source: https://ssdrive.net/intel-dc-p5800x-400-gb