P64633-001 is the HPE spare part number for 16GB (1x16GB) Single Rank x8 DDR5-4800 CAS-40-39-39 Unbuffered Standard Memory Kit. This is the number printed on the module label and referenced in HPE service documentation and iLO memory event logs when a DIMM fails. The part is a 16 GB unbuffered DDR5 SDRAM module in a 288-pin DIMM form factor, running at 4800 MHz (PC5-38400) with CL40 (40-39-39) timings, single rank, x8 chip organization, at 1.2 V. It is a system-specific upgrade supported in 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 P64633-001:
- 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 P64633-001
What is the difference between P64633-001 and P64336-B21?
They are the same physical memory module under two HPE numbering schemes. P64633-001, the number on this page, is the spare part number, used for service replacement and printed on the module itself. P64336-B21 is the option kit number used when ordering the memory as a configurable upgrade. This family also includes one assembly revision, listed in the cross-reference block on this page. An assembly part number identifies the module as built and revised at manufacturing level, rather than as a sales or service item.
Will this module work in my server?
This is a system-specific upgrade. The compatible platforms listed for it are the HPE ProLiant DL20 Gen11 and ML30 Gen11. Because it is an unbuffered DDR5 DIMM, it cannot substitute for registered memory, and the host system must support unbuffered modules. Confirm the failed DIMM in your server carries this same specification, single rank, x8, DDR5-4800, before installing the replacement.
What are the exact electrical specifications?
The module is DDR5 SDRAM in a 288-pin DIMM form factor with a capacity of 16 GB in a single module. It runs at 4800 MHz, rated PC5-38400, with CAS latency timings of CL40 (40-39-39). It is single rank with x8 chip organization and unbuffered, operating at 1.2 V. These values should match the failed module reported in your iLO log.
Can I mix this module with the existing memory in my server?
Match the replacement to what is already installed. This module is single rank with x8 organization, unbuffered, DDR5-4800 at CL40 (40-39-39). Mixing modules of different rank, organization, speed or latency within a supported DL20 Gen11 or ML30 Gen11 configuration is governed by the HPE memory population rules for that platform, so verify your existing population before installing.
What arrives in the box?
A single 16 GB DDR5 DIMM. The kit is described as 1x16GB, so one 288-pin module ships per part number, not a matched pair. If your server has multiple failed DIMMs reported in iLO, you will need one unit per slot being replaced. No riser, heatsink or mounting hardware is part of this memory part number.
HPE PARTSURFER INFO FOR P64633-001 (P64336-B21)
| Spare PN | Description | |
|---|---|---|
| P64633-001 | SPS-DIMM,16GB PC5-4800B-E,2Gx8 |
Last Updated: 2026-06-26
- Trusted by thousands. Over 36,000 customers in 100+ countries trust Global One Technology to deliver mission-critical HP Enterprise hardware - including Fortune 500 businesses, schools, hospitals, and federal, state, and local government agencies.
- HPE is our specialty! We only sell genuine HP Enterprise parts.
- EASY ordering process. Purchase online now with credit card or PayPal!
- FAST shipping. Global One Technology ships orders received by 4 PM ET the same day and offers NEXT DAY delivery to US customers.
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.
