610675-001 is the HPE assembly part number for 2GB P-series Smart Array Flash Backed Write Cache. This is the number most often printed on the module label itself and returned by HPE PartSurfer lookups, so it is what you will typically see when identifying a module already installed in a server. The part is a 2GB RAID controller cache memory module with flash backed write cache for P-series Smart Array controllers. Supported servers include the DL160 Gen8, DL320e Gen8, DL360e Gen8, DL360p Gen8, DL380e Gen8, DL380p Gen8, DL385p Gen8, DL560 Gen8, ML310e Gen8, ML310e Gen8 v2, ML350e Gen8, ML350p Gen8, SL4540 Gen8 and SL4545 G7.
HPE Option Part #: 631681-B21
HPE Spare Part #: 633543-001
HPE Assembly Part #: 610675-001
PRODUCT SPECIFICATIONS FOR 610675-001:
- Product Type: RAID controller cache memory
- Cache Memory Capacity: 2GB
RESOURCES FOR 610675-001 (631681-B21)
Quickspecs for 631681-B21COMPATIBLE WITH:
PROLIANT DL SERIES
PROLIANT ML SERIES
PROLIANT SL SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT 610675-001
What is the difference between 610675-001, 631681-B21 and 633543-001?
They identify the same physical product under three different HPE numbering schemes. 610675-001, the subject of this page, is the assembly number, which is the number commonly found on the module label and in PartSurfer records. 631681-B21 is the option number used for ordering the product as a sellable option. 633543-001 is the spare number used for service replacement. The hardware itself is identical in all three cases.
I found 610675-001 on the label of a module I pulled. Is that the right number to search?
Yes. Assembly numbers such as 610675-001 are printed on the physical module and appear in HPE PartSurfer listings, so it is a valid identifier when confirming what you are holding. Because the same hardware also carries an option number and a spare number, searches under those numbers will return the same 2GB P-series Smart Array Flash Backed Write Cache module.
What does this part do?
It is a RAID controller cache memory module with 2GB of cache capacity for HPE P-series Smart Array controllers. The flash backed write cache design pairs the cache memory with flash-based backup so cached write data is preserved rather than depending on cache memory alone. It is a controller accessory, not a drive or a standalone storage device.
Which servers accept this module?
The listed compatible servers are the DL160 Gen8, DL320e Gen8, DL360e Gen8, DL360p Gen8, DL380e Gen8, DL380p Gen8, DL385p Gen8, DL560 Gen8, ML310e Gen8, ML310e Gen8 v2, ML350e Gen8, ML350p Gen8, SL4540 Gen8 and SL4545 G7. If you are verifying a module removed from one of these systems, 610675-001 is consistent with that platform set.
HPE PARTSURFER INFO FOR 610675-001 (631681-B21)
| Spare PN | Description | |
|---|---|---|
 | 633543-001 | 2GB flash backed write cache (FBWC) memory module, 72-bit wide - Part does not include the controller board or capacitor module - For use with the P420, P421, P430, P431, 822, and 830 Smart Array controllers |
| 660093-001 | Capacitor pack with 914mm (36 in) cable. For use with 512MB/1GB/2GB cache module - Provides back up power to the flash-based write cache (FBWC) memory module for up to 80 seconds in the event of a system power failure. For use with Smart Array controllers |
Last Updated: 2026-05-27
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This product is warrantied against hardware failure for a period of 1 Year 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.
