Intel announced the Optane Memory M15 on May 29, 2019, as a faster successor to the Optane Memory M10. It used 3D XPoint media, an M.2 PCIe 3.0 x4 interface and announced capacities of 16GB, 32GB and 64GB. Intel initially discussed July or mid-third-quarter availability, but later removed the M15 from its memory roadmap. In 2026, it is best understood as an announced, effectively canceled cache product—not a conventional retail SSD you can confidently build around.
What the Optane Memory M15 was
The M15 was designed primarily as an Intel Optane caching module. With Intel’s software stack, it could accelerate a separate SATA storage device such as a hard disk drive, SATA SSD or SSHD. Intel distinguishes these M-series cache modules from H10 and H20 products, which combined Optane memory and QLC NAND on one device (Intel’s product explanation).
Without Optane caching software, the module could also enumerate as a conventional NVMe device. Its maximum announced capacity of 64GB, however, made that a specialist use rather than a practical general-purpose boot drive. Contemporary launch coverage described it as an M.2 2280, M-key module using NVMe 1.1 over PCIe 3.0 x4 (AnandTech).
The M15 was announced during the Computex 2019 period. Intel did not announce pricing.
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- Pair Intel Optane memory with storage media (HDD, SSD), to get amazing performance and responsiveness without compromising storage capacities
- Supported on 7th Gen Intel Corei3 processor and above
- Requires Optane Ready Motherboard and storage drive such as HDD and/or SSD
- A computer with Intel Optane memory adapts to your everyday computing activities to make your repetitive tasks increasingly faster, smoother and easier to accomplish
Announced specifications
These are Intel-announced figures reported in contemporary coverage, not independently verified production or retail benchmarks.
| Specification | Optane Memory M15 |
|---|---|
| Media | Intel 3D XPoint, 20nm process description |
| Capacities | 16GB, 32GB and 64GB |
| Form factor | M.2 2280 (as described in launch coverage) |
| Key and interface | M-key, PCIe 3.0 x4 |
| Protocol | NVMe 1.1 |
| Sequential read | Up to 2,000MB/s |
| Sequential write | Up to 900MB/s |
| Random read | Up to 450,000 IOPS at QD4 |
| Random write | Up to 220,000 IOPS at QD4 |
| QD1 latency | 6.75µs read; 12µs write |
| Maximum active power | 5.5W |
| Idle power | Under 5mW |
| Endurance | 365TB |
| Warranty | Five years |
| Expected availability at announcement | Around July or mid-Q3 2019 |
| Announced price | Not announced |
Some later reseller databases call M15-related parts M.2 2242. That conflicts with the contemporary 2280 description and does not establish a production specification, particularly because Intel later removed the product from its roadmap.
M15 versus Optane Memory M10
The headline hardware change was the move from PCIe 3.0 x2 to PCIe 3.0 x4. That increased available host bandwidth, but it did not double every result or change the M-series capacity model.
| Feature | M15 | M10 |
|---|---|---|
| Interface | PCIe 3.0 x4 | PCIe 3.0 x2 |
| Protocol | NVMe 1.1 | NVMe 1.1 |
| Capacities | 16GB, 32GB, 64GB | 16GB, 32GB, 64GB |
| Sequential read | Up to 2,000MB/s | Up to 1,450MB/s |
| Sequential write | Up to 900MB/s | Up to 640MB/s |
| Random read, QD4 | Up to 450k IOPS | Up to 250k IOPS |
| Random write, QD4 | Up to 220k IOPS | Up to 140k IOPS |
| QD1 latency | 6.75µs read; 12µs write | 6.75µs read; 18µs write |
| Maximum active power | 5.5W | 3.5W |
| Idle power | Under 5mW | 11mW |
| Endurance | 365TB | 365TB |
| Warranty | Five years | Five years |
Intel’s announced random-read ceiling rose by about 80 percent, while low-queue-depth read latency stayed the same. Sequential transfers benefit more directly from extra PCIe lanes; everyday cache activity often consists of small, low-queue-depth requests, where Optane’s latency—not peak bandwidth—is the more important characteristic.
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Why 3D XPoint mattered
Intel and Micron developed 3D XPoint as nonvolatile memory intended to reduce latency and improve endurance compared with conventional NAND in suitable workloads. The M15’s appeal was therefore not simply its sequential rating. Optane was aimed at responsive small-block access, consistent random performance and heavy write activity.
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That did not make it universally faster than NAND. A cache still had to fit inside 16GB, 32GB or 64GB, and the underlying hard drive or SATA SSD remained part of the storage path. PCIe 3.0 x4 removed an interface constraint from the M10 design; it did not turn the M15 into a high-capacity NVMe SSD.
Compatibility and caching requirements
Intel’s announced caching target was a Kaby Lake-or-newer platform with Intel Rapid Storage Technology (RST) 17 or later. The requirements applied to Optane caching, not necessarily to generic NVMe enumeration.
- An Optane-ready Intel motherboard and chipset.
- BIOS support for Intel Rapid Storage Technology and an appropriately routed or remapped M.2 slot.
- Windows 10 64-bit for the original caching software path.
- A supported SATA-based drive to accelerate.
- Correct partitioning and system configuration.
Intel’s broader FAQ describes the original support matrix as including a seventh-generation-or-newer Intel Core processor, Intel 200-series-or-newer chipset conditions, a compatible M.2 connector, BIOS support and Intel RST software (Intel Optane Memory FAQ).
An open M.2 slot is not sufficient proof that Optane caching will work. A system may recognize a module as NVMe while lacking the BIOS, RST version or platform support needed to accelerate another drive.
What happened to the M15?
AnandTech’s May 2019 report said Intel expected availability around July or the middle of the third quarter, but it did not confirm retail shipment or provide a price (contemporary announcement coverage).
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- Setup Requirements: This product requires additional steps to set it up. Please ask questions if you're not familiar with this Intel Optane Drive. Optane Memory H10 with Solid State Storage
- Storage Capacity: 1TB Solid State Drive with 32 GB Buffer for enhanced performance and caching capabilities
- Drive Performance: Maximum Read Transfer Rate of 2400 MB/s for fast data access and file loading
- Write Speed: Maximum Write Transfer Rate of 1800 MB/s for efficient data storage and transfer operations
- Endurance and Interface: 300 TB Total Bytes Written (TBW) with PCI Express 3.0 x4 interface for reliable long-term performance
Intel later told a customer in its support community that it had decided to remove the M15 from its memory roadmap. The same response said HDD acceleration would continue with the M10 and that the related 815P would not come to market (Intel support-community response).
That distinction matters: the M15 should not be described as a normally launched retail product merely because Intel announced it and published specifications. An isolated marketplace listing could be a mislabeled M10, an engineering sample, an old database entry or rare leftover stock.
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| Product | Role and status |
|---|---|
| Optane Memory M15 | Announced 16GB–64GB cache module; later removed from Intel’s roadmap |
| Optane SSD 800P | Standalone Optane NVMe SSD, approximately 58GB and 118GB; discontinued |
| 815P | Related planned product Intel said it would not bring to market |
Intel’s product portfolio lists the 800P separately from M-series memory products (Intel Optane Technology Product Portfolio). The 800P is therefore the closer historical comparison for a normal Optane boot or application drive, while the M15 was conceived around caching.
What the M15 means in 2026
Intel’s support material lists the M15 Series among discontinued Optane products and says future Optane development was discontinued, while existing products retain support and warranty coverage for their applicable lifetimes (Intel discontinued Optane information; Intel Optane technology FAQ).
Intel says M-series products reached end of interactive support on May 29, 2024; warranty terms from the date of sale are separate (Intel support notice). Intel also warns that RST 19.0 and later no longer support affected Optane Memory SKUs, creating a particular problem on newer 12th- and 13th-generation platforms (Intel compatibility guidance).
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Should you buy an M15 listing?
For a new system or ordinary storage upgrade, no. A current high-capacity PCIe NVMe SSD offers broader operating-system compatibility, vastly more space and no Intel-specific caching dependency.
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If you encounter an alleged M15, treat it as an unverified collector or experimentation purchase:
- Request a photograph of the exact Intel model number and label.
- Check the module’s physical keying and reported firmware identification.
- Confirm whether the seller accepts returns if the device is actually an M10, prototype or nonfunctional sample.
- Verify the target motherboard, BIOS and RST combination before changing any storage configuration.
A used M10 is the historically relevant choice for an officially shipped Intel HDD-cache setup, while a used 800P is the closer Optane option for standalone NVMe use. Both are discontinued and make sense only for enthusiasts with a known-compatible older platform.
Safe handling of an existing Optane volume
Back up the accelerated drive before changing Optane or RST settings. Do not remove the module or switch SATA/RAID BIOS modes while an Optane volume is active unless it has first been disabled through the supported software path. Intel’s recovery guidance covers resetting to non-Optane and deconcatenating volumes that were not disabled correctly (Intel troubleshooting guidance).
Frequently Asked Questions
Was the Optane Memory M15 ever released?
Intel announced it and initially discussed July or mid-Q3 2019 availability, but later said it had removed the M15 from its memory roadmap. There is no evidence of a normal broad retail launch.
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Was there a 128GB M15?
No 128GB model was included in the May 2019 announcement. The announced range was 16GB, 32GB and 64GB; 128GB expectations were likely confusion with other Optane products or concepts.
Can an M15 work in an AMD system?
Generic NVMe detection is a separate question from Optane caching. Intel’s caching software and platform requirements were Intel-specific, so an AMD system should not be assumed to support the M15 as a cache device.
Is the M15 the same as the Optane 800P?
No. The M15 was an announced 16GB–64GB cache module; the 800P was a separately sold standalone Optane SSD in approximately 58GB and 118GB capacities.
Does it work on 12th- or 13th-generation Intel platforms?
Intel states that RST 19.0 and later no longer support affected Optane Memory SKUs, so newer platforms are a poor fit for the original caching model.
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The Optane Memory M15 was a technically interesting PCIe 3.0 x4 evolution of Intel’s small Optane cache modules, but it never became a normal retail product. Its announced specifications explain the design; they do not make it a sensible 2026 storage purchase.
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