3D XPoint

3D XPoint · cross-point memory · Intel Micron 3D XPoint

The underlying media—not the Optane product line. Manufacturing at scale ended with Micron’s 2021 exit and Intel’s 2022 Optane wind-down.

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3D XPoint is a non-volatile memory technology co-developed by Intel and Micron, announced in 2015 as a cross-point array with bit-addressable cells distinct from NAND flash. It sits in the storage-class memory gap between DRAM latency and flash endurance economics. Intel branded retail and datacenter products Optane; Micron briefly marketed QuantX before exiting the technology.

3D XPoint was the science-project that became a product line. Intel and Micron spent years in IM Flash before the 2015 reveal: cross-point arrays, new materials, promises of DRAM-like speed with flash-like persistence. The hype was loud; the physics stayed partly opaque.

Commercial life followed separate branding. Intel’s Optane SSDs and Apache Pass persistent memory put 3D XPoint in PCIe slots and DIMM sockets. Micron’s QuantX path never matched Intel’s volume. When Micron walked away in 2021, Lehi sold to Texas Instruments and wafer output for XPoint ended.

Intel’s 2022 decision to stop developing new Optane generations effectively closed the chapter on 3D XPoint as a shipping media roadmap—though fielded drives and PMem modules may linger in warranty. The Observatory keeps 3D XPoint as the technology name and Optane as the Intel product umbrella.

The Jul 28, 2015 release is the record for the launch multiples and the initial die. Speed and endurance are each “up to 1,000 times” versus other industry NAND. Density is 10 times, not “up to” 10 times, versus other industry DRAM. 128Gb per die is only the initial technology across two memory layers. The July 16, 2018 release still places manufacture at the Intel-Micron Flash Technologies (IMFT) facility in Lehi, Utah, and says second-generation joint development is expected in the first half of 2019. The Form 10-Q for the quarter ended December 2, 2021 records the Lehi sale closing on October 22, 2021, a first-quarter 2022 receipt of $893 million, and a recognized loss of $23 million. [3dxpoint-intel-press-2015] [3dxpoint-joint-dev-2018] [3dxpoint-micron-10q-lehi]

Compared to neighbors

NAND flash SSDs use block erase and FTL mapping. DRAM is volatile. 3D XPoint was marketed as byte-addressable, low-latency NVM—a different design point than TLC/QLC SSDs or Optane-as-brand marketing alone.

Strengths

New memory category claim — Intel and Micron’s 2015 release positioned 3D XPoint as the first new mainstream non-volatile memory class since NAND flash (vendor announcement).
Cross-point architecture — press materials describe a transistor-less grid of selectors and memory cells addressable per bit, unlike block-erasable NAND.
Low-latency NVM use cases — Intel shipped Optane SSDs and persistent memory modules on 3D XPoint for caching, journaling, and memory expansion (see Optane card).
Joint manufacturing — early production ran at IM Flash Lehi, Utah; EE Times reported 128 Gb die in production at announcement (vendor claim).
Initial two-layer die — The Jul 28, 2015 joint release’s Cross Point Array Structure bullet says perpendicular conductors connect 128 billion densely packed memory cells and that each memory cell stores a single bit of data. The Stackable bullet says the initial technology stores 128Gb per die across two memory layers. The same bullet says future generations can increase the number of memory layers; that prospect is not a later layer count. [3dxpoint-intel-press-2015]

Limits

Vendor performance claims — “up to 1,000× faster than NAND” and similar figures are from 2015 marketing; real-world gaps depend on workload and product generation.
Micron ceased development March 2021 — SEC exhibit press release cites insufficient market validation to commercialize at scale.
No public successor roadmap — neither Intel nor Micron publishes a next-generation 3D XPoint process after the wind-down.
Proprietary chemistry — Intel and Micron did not fully disclose materials or switching physics in launch materials (trade press noted limited technical disclosure).
Jul 28, 2015 comparison bounds — That release says the technology is up to 1,000 times faster and has up to 1,000 times greater endurance than NAND, and is 10 times denser than conventional memory. Footnote 1 bases the performance difference on 3D XPoint technology versus other industry NAND. Footnote 3 bases the endurance difference on that same NAND comparison. Footnote 2 bases the density difference on other industry DRAM. The density line does not say “up to.” These are the Jul 28, 2015 launch comparisons, not a later measured product rating. [3dxpoint-intel-press-2015]
2018 joint development versus the later Lehi sale — The July 16, 2018 release says the companies agreed to complete joint development for the second generation of 3D XPoint technology, which is expected to occur in the first half of 2019, that development beyond that generation will be pursued independently, and that the two companies will continue to manufacture memory based on 3D XPoint technology at the Intel-Micron Flash Technologies (IMFT) facility in Lehi, Utah. The Form 10-Q for the quarterly period ended December 2, 2021 is a later record. It says a definitive agreement to sell the Lehi facility to TI was announced on June 30, 2021 and the sale closed on October 22, 2021. TI is defined in that filing as Texas Instruments Incorporated. In the first quarter of 2022, the quarter that filing covers, Micron received $893 million from TI and recognized a loss of $23 million included in restructure and asset impairments. In the third quarter of 2021 it recognized a charge of $435 million included in restructure and asset impairments (and a tax benefit of $104 million included in income tax (provision) benefit) to write down the assets held for sale to the expected consideration, net of estimated selling costs. In the second quarter of 2021 it recognized a charge of $49 million in cost of goods sold to write down 3D XPoint inventory. [3dxpoint-joint-dev-2018] [3dxpoint-micron-10q-lehi]

Typical fits

Historical datacenter caching and metadata tiers on Optane SSDs
Memory expansion with Intel Optane persistent memory on supported Xeon platforms (EOL era)
Understanding storage-class memory discussions circa 2017–2022

Uncertainty notes

firstSeen is the July 28, 2015 Intel/Micron joint announcement date.
lastSeen approximates Intel’s Q2 2022 public wind-down of future Optane development—not the last warranty support date for individual SKUs.
Speed and endurance multiples in launch materials are vendor claims, not independent benchmarks on this card.
The 128 billion cells, the 128Gb per die across two memory layers, the “up to 1,000 times” speed and endurance versus other industry NAND, and the 10 times density versus other industry DRAM are printed on the Jul 28, 2015 joint release, including footnotes 1, 2, and 3. They are not a later product measurement. [3dxpoint-intel-press-2015]
The March 16, 2021 exhibit says Micron will cease development of 3D XPoint with immediate effect and aims to reach a sale agreement for the Lehi fab within calendar year 2021. The Form 10-Q for the quarter ended December 2, 2021 places the cease-development decision in the second quarter of 2021, the definitive agreement on June 30, 2021, and the close on October 22, 2021. Those are two records, not one date. [3dxpoint-micron-cease-2021] [3dxpoint-micron-10q-lehi]

Sources

01Intel — press release: Intel and Micron produce breakthrough memory technology (3D XPoint) · accessed 2026-11-02
02Business Wire — Intel and Micron unveil 3D XPoint technology (July 28, 2015) · accessed 2026-10-06
03EE Times — Intel, Micron launch bulk-switching ReRAM / 3D XPoint (128 Gb die claim) · accessed 2026-10-06
04Micron — SEC exhibit: cease 3D XPoint development; shift to CXL (March 16, 2021) · accessed 2026-11-02
05Intel newsroom archive PDF — News Release dated July 16, 2018, on the 3D XPoint joint development program · accessed 2026-11-02
06Micron Technology, Inc. Form 10-Q for the quarterly period ended December 2, 2021 — Lehi, Utah Fab and 3D XPoint · accessed 2026-11-02
07Micron — completes sale of Lehi fab (ended 3D XPoint production site) · accessed 2026-10-06
08Intel — Optane business update (cease future Optane development) · accessed 2026-10-06