A requiem for Optane, Intel's KV cache killer that could have eased the RAM price crunch

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A requiem for Optane, Intel's KV cache killer that could have eased the RAM price crunch

With microscopic latencies and otherworldly write endurance, it was perfect for today's AI workloads – but gone before they arrived

Tobias Mann

Tobias<br>Mann

SYSTEMS EDITOR

Published<br>wed 29 Jul 2026 // 00:27 UTC

History is littered with the corpses of technologies that were ahead of their time, and Intel’s Optane storage and memory products are certainly among them.<br>Expensive, badly misunderstood, and awkwardly priced, the technology struggled to find a place in the market, surviving just five years before Chipzilla pulled the plug.<br>Things might have been different if it were launched today. The shift from AI training to inference has driven tremendous demand for DRAM and NAND flash. In fact, the same properties that made Optane a niche product a few years ago would have made it ideally suited to these write intensive AI workloads.

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The rise and fall of Optane

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Intel and Micron co-developed Optane – or more specifically, 3D XPoint memory – and unveiled it in 2015. It promised to bridge the gap between conventional NAND flash used in SSDs and DRAM used in DDR4 and (later) DDR5.<br>Like NAND, 3D XPoint was non-volatile, which means data persists when unpowered, making it appropriate for storage applications.<br>But unlike NAND, 3D XPoint didn’t store data using trapped electrons and instead relied on a phase change material that was both extremely fast, achieving sub-10-microsecond latencies (even lower for later PMem modules), and absurdly write-endurant.<br>Intel’s penultimate Optane SSDs boasted endurance of 100 drive writes a day and a mean time between failures of two million hours — specs that remain unrivaled today.<br>Those figures are of course extrapolated, based on what we know about how 3D XPoint reads and writes data. But if anything, we suspect Intel was probably being conservative with its claims.<br>This one-two punch of endurance and latency, particularly for random reads and writes meant that it could be used as a second tier of system memory. Optane SSDs are really, really low latency for storage-class memory, but they’re still orders of magnitude less responsive than DRAM which can hit 100 nanoseconds or lower. We should note Intel’s PMem DIMMs were capable of latencies of roughly 350 nanoseconds.<br>Intel’s Optane persistent memory also had the benefit of capacities up to 512 GB per DIMM, at a time when the most you could expect out of DDR4 was about 128 GB – and only if you had deep pockets.<br>These persistent memory DIMMs could be made to behave like main memory, with standard DDR4 functioning as a massive L4 cache when enabled; as a storage pool; or in an application-aware memory mode, which exposed the Optane memory directly to select applications.

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Despite Optane’s many strengths, it was rather awkwardly priced. For the same memory density, 3D XPoint was consistently more expensive than NAND and, while cheaper than DRAM, significantly less performant.<br>As a result, there was rarely a scenario in which users were better off with Optane than they would be just buying more NAND or fewer, bigger DIMMs.

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To make matters worse, as the boffins at TechInsights noted at the time, while 3D XPoint had its merits, it wasn’t improving quickly enough to keep up with NAND flash on bit density.<br>By 2021, Micron had had enough. The memory vendor announced it would end development of 3D XPoint products. With no source of new silicon for its SSD and persistent memory products, the writing was on the wall for Optane.<br>Intel's then-CEO Pat Gelsinger officially pulled the plug in 2022, ending development of new products under the Optane banner. The P5810X and P5811X, the final Optane products to roll off the assembly line, launched in late 2022.<br>Ahead of its time<br>The same year Intel pulled the plug on Optane, a new workload was emerging that would completely turn the datacenter on its head, and might very well have been the killer app to justify 3D XPoint’s continued development.<br>In November 2022, OpenAI, then a relatively obscure AI startup, lifted the curtain on ChatGPT, kicking off an AI arms race and sparking a massive influx of money into the tech sector.

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