HP 128GB 3200MHz DDR4 PC4-25600 ECC Registered CL22 288-Pin DIMM Optane Persistent Memory Module – P23532-B21

HPE P23532-B21 128GB Intel Optane Persistent Memory 200 Series — DDR-T NVDIMM

The HPE P23532-B21 is a 128GB Intel Optane Persistent Memory 200 Series module (PMem 200) — an HPE-certified DDR-T NVDIMM for HPE ProLiant Gen10 Plus servers with Intel Xeon Scalable 3rd Gen (Ice Lake) processors. Unlike standard DDR4 DRAM, Optane PMem uses Intel 3D XPoint non-volatile memory to deliver byte-addressable persistent storage at near-DRAM speeds, enabling ultra-large memory capacity and data persistence across power cycles.

Key Features

• 128GB Intel Optane Persistent Memory 200 (PMem 200) — non-volatile byte-addressable memory
• Operates in Memory Mode (volatile DRAM-like) or App Direct Mode (persistent storage)
• DDR-T interface at 3200MHz for near-DRAM bandwidth with persistent data retention
• HPE-certified for ProLiant Gen10 Plus with Ice Lake Xeon processors
• Enables terabyte-scale in-memory capacity exceeding DRAM-only configurations

Product Specifications

• Part Number: P23532-B21
• Manufacturer: HP / HPE (Intel Optane PMem 200)
• Capacity: 128GB
• Type: Intel Optane Persistent Memory 200 (DDR-T NVDIMM)
• Speed: 3200MHz (PC4-25600 equivalent DDR-T)
• CAS Latency: CL22 (DDR-T equivalent)
• Interface: 288-Pin DDR4 slot (DDR-T)
• Persistence: Yes — non-volatile (data retained across power cycles)

Memory Specifications

• Memory Technology: Intel 3D XPoint (non-volatile)
• Operating Modes: Memory Mode (volatile), App Direct Mode (persistent), Mixed Mode
• Form Factor: DIMM (288-pin, DDR-T, requires DDR4 slot)
• Data Persistence: Yes — data survives power loss in App Direct Mode
• ECC: Yes — ECC protected

Performance Specifications

• Read Bandwidth: Up to ~36.8 GB/s (Memory Mode, per module)
• Write Bandwidth: Up to ~12.8 GB/s (Memory Mode, per module)
• Latency: Higher than DRAM (~300ns vs. ~80ns for DDR4) — optimized for bandwidth over latency
• IOPS: Optimized for sequential and large-block I/O patterns

Use Cases

• SAP HANA scale-up with terabyte-scale in-memory capacity beyond DRAM-only limits
• In-memory database acceleration using App Direct Mode for persistent data tier
• Memory Mode for transparent DRAM capacity expansion beyond DIMM slot limits
• AI/ML training datasets and large model inference requiring massive in-memory capacity

Compatibility

• HPE ProLiant Gen10 Plus servers with Intel Xeon Scalable 3rd Gen (Ice Lake) — PMem 200 required
• Requires DDR4 DIMM slots paired with DRAM DIMMs per Intel”s 1:1 or 1:4 DRAM:PMem ratio
• Not compatible with Gen10 (Cascade Lake) — use PMem 100 for Gen10 Cascade Lake platforms
• Requires Intel Optane PMem 200 software drivers and OS/application support for App Direct Mode

Frequently Asked Questions

What is the difference between Memory Mode and App Direct Mode for Optane PMem?

In Memory Mode, Optane PMem acts as volatile memory capacity, with DRAM serving as a cache — applications see a large pool of memory-like storage transparently, with no application modifications required. In App Direct Mode, Optane PMem appears as a persistent memory device that applications can write to directly, with data surviving power cycles — requiring application or file system support (DAX-capable file systems like NDCTL/fsdax). Mixed Mode enables both simultaneously on different PMem modules.

What is the difference between P23532-B21 and P31373-001?

Both are HPE 128GB Intel Optane Persistent Memory 200 Series modules with identical specifications — P23532-B21 is the standard HPE option kit (-B21) for channel ordering, while P31373-001 is the HPE factory/OEM (-001) variant. Both are functionally identical and interchangeable in supported HPE ProLiant Gen10 Plus servers with Ice Lake processors.

Can Optane PMem 200 be used with AMD EPYC processors?

No — Intel Optane Persistent Memory requires Intel”s DDR-T memory controller, which is exclusive to Intel Xeon Scalable processors. AMD EPYC processors use standard DDR4/DDR5 memory controllers and do not support Intel Optane PMem. HPE ProLiant Gen10 Plus servers with AMD EPYC 3rd Gen (Milan) processors cannot use Optane PMem modules.

The HPE P23532-B21 128GB Intel Optane Persistent Memory 200 delivers byte-addressable non-volatile memory capacity at near-DRAM bandwidth — enabling terabyte-scale in-memory configurations and persistent data tiers for HPE ProLiant Gen10 Plus servers running SAP HANA, in-memory databases, and AI workloads that require memory capacity beyond what DRAM alone can economically provide.