Innodisk DDR5 12800 MT/s MRDIMM Gen2: Specs, Release Date, and Why It Matters for AI

On July 30, 2026, Innodisk formally introduced its DDR5 12800 MT/s MRDIMM (Multiplexed Rank DIMM) Gen2, a memory module engineered to relieve the bandwidth bottleneck in AI inference, training, and large language model (LLM) workloads . With samples slated for Q4 2026, the module represents the second generation of the MRDIMM standard — one that JEDEC is finalizing to push server memory past the limits of conventional DDR5 RDIMMs . Here is a detailed look at the specifications, availability, architecture, and industry context.

Key Specifications at a Glance

Innodisk's DDR5 MRDIMM Gen2 is built around two new silicon components — an MRCD (Multiplexed Registering Clock Driver) and ten MDBs (Multiplexed Data Buffers) per module — that enable simultaneous access to two memory ranks, effectively doubling the data rate per channel .

• Speed: 12,800 MT/s (DDR5-12800)
• Generation: Second-generation MRDIMM (Gen2), delivering a 45% speed improvement over first-gen MRDIMM
• Capacity options: 32 GB, 48 GB, 64 GB, 96 GB, and 128 GB per module
• Operating temperature: 0°C to 95°C, suitable for industrial and data-center environments
• Protection features: Integrated eFuse and TVS (Transient Voltage Suppression) for surge protection
• Form factor: 287-pin design, compatible with existing DDR5 RDIMM slots

Availability Timeline

• Formal announcement: July 30, 2026
• Sampling: Q4 2026

The module was previously shown at Computex 2026 (June) and Embedded World 2026 (March), but the formal launch and sampling schedule were confirmed in late July .

How It Compares to DDR5 RDIMMs

The fundamental architectural difference is that MRDIMM multiplexes data from two ranks through MRCD and MDB components, rather than relying solely on a higher pin clock rate. This approach reduces memory controller load and improves effective latency compared to simply scaling frequency on a standard RDIMM design .

Metric	Innodisk DDR5 MRDIMM Gen2	Typical DDR5 RDIMM (previous gen)
Data rate	12,800 MT/s	8,000 MT/s (high-end) / 6,400 MT/s (standard)
Bandwidth vs. 8000 MT/s RDIMM	~60% higher	Baseline
Architecture	Multiplexed dual-rank access via MRCD + MDB	Single-rank access per channel via standard RCD
Pin/slot compatibility	287-pin — fits DDR5 RDIMM slots	288-pin standard

Industry Context: The JEDEC Roadmap and AI Demand

This launch aligns with JEDEC's finalization of the DDR5 MRDIMM Gen2 standard, which targets 12,800 MT/s as the defined speed for next-generation server memory . The JEDEC roadmap already points to MRDIMM Gen3 targeting 17,600 MT/s . The driving force is the insatiable bandwidth demand from AI inference and training — large language models (LLMs), generative AI, and robotics — where memory bandwidth directly constrains token generation throughput .

Innodisk positions this module within its "AI Memory Series," alongside CXL memory modules and LPCAMM2, targeting both data-center servers and edge AI systems that need high-bandwidth memory in a standard DDR5 socket without migrating to entirely new platforms . Rambus, a key chipset supplier, has also confirmed its MRDIMM chipset components for the 12,800 MT/s tier, reinforcing the ecosystem's readiness .