P64338-0A1 is the HPE assembly part number for 16GB (1x16GB) Single Rank x8 DDR5-4800 CAS-40-39-39 Unbuffered Standard Memory Kit. If you are reading a label on the module itself or matching an entry in HPE PartSurfer, this number identifies the built assembly rather than the boxed option. The module is a 288-pin DDR5 UDIMM rated at 4800 MHz (PC5-38400) with CL40 (40-39-39) timings, single rank, x8 chip organization, and 1.2 V operation. It is a system-specific upgrade for the HPE ProLiant DL20 Gen11 and ML30 Gen11.
HPE Option Part #: P64336-B21
HPE Spare Part #: P64633-001
HPE Assembly Part #: P64338-0A1
PRODUCT SPECIFICATIONS FOR P64338-0A1:
- Capacity: 16 GB
- Upgrade Type: System specific
- Type: DRAM memory module
- Technology: DDR5 SDRAM
- Form Factor: DIMM 288-pin
- Speed: 4800 MHz (PC5-38400)
- Latency Timings: CL40 (40-39-39)
- Features: Single Rank, unbuffered
- Chips Organization: X8
- Voltage: 1.2 V
COMPATIBLE WITH:
PROLIANT DL SERIES
PROLIANT ML SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT P64338-0A1
What is the difference between P64338-0A1, P64336-B21 and P64633-001?
All three numbers refer to the same physical memory module. P64338-0A1, the number on this page, is the assembly part number, the identifier used for the manufactured unit and commonly seen on labels and in PartSurfer. P64336-B21 is the option part number, the orderable configuration used when purchasing the module as a kit. P64633-001 is the spare part number used for replacement fulfillment. The DDR5-4800 specifications are identical across all three.
How do I confirm the module in hand matches P64338-0A1?
Check the label against the core specifications: 16 GB capacity, DDR5 SDRAM, 288-pin DIMM form factor, 4800 MHz (PC5-38400) rated speed, CL40 (40-39-39) latency timings, single rank, x8 chip organization, unbuffered, and 1.2 V. A module matching all of those points, and carrying P64338-0A1 or one of its sibling numbers, is the same product described here.
Which servers accept this module?
This is a system-specific upgrade. The supported platforms are the HPE ProLiant DL20 Gen11 and the HPE ProLiant ML30 Gen11. Both use unbuffered DDR5 DIMMs, which is what this part is. Because the module is unbuffered rather than registered, it should not be substituted into platforms that require registered memory. Confirm the target server model before installation.
What do the single rank, x8 and unbuffered designations mean here?
Single rank means the module presents one set of memory devices to the memory controller. The x8 organization describes the data width of each DRAM chip on the module. Unbuffered means there is no register between the memory controller and the DRAM devices, which is the configuration used by the DL20 Gen11 and ML30 Gen11. These attributes are part of the module's identity and must match when replacing a like part.
HPE PARTSURFER INFO FOR P64338-0A1 (P64336-B21)
| Spare PN | Description | |
|---|---|---|
| P64633-001 | SPS-DIMM,16GB PC5-4800B-E,2Gx8 |
Last Updated: 2026-06-26
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This product is warrantied against hardware failure for a period of 5 Years from the date of purchase. Before making a purchase, please take a moment to review our return policy below.
Returns
It is the customer's responsibility to verify compatibility with their machine(s) before placing an order. If an item is ordered by mistake, it can be returned for refund, minus a 25% restocking fee, within 5 business days of receipt. The cost of freight is not refundable.
Please be aware that factory-sealed equipment can only be returned if it remains unopened.
Defective Products
If you have received a defective part and your machine is still within the HPE warranty period, please initiate a warranty exchange by visiting the HPE Enterprise Support Center. Be sure to have the serial numbers of the defective drive and your server/storage array handy.
In case your hardware becomes defective during the Global One warranty period, but the HPE warranty has expired, you can return the product to us for a working replacement. You are responsible for the shipment of returned merchandise. However, we will cover the expense of Ground /Economy shipment for the replacement item(s).
Requesting an RMA
To initiate a return or warranty claim, please complete and submit the RMA Request Form.
