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804331-B21: HPE Smart Array P408i-a SR Gen10 12G SAS Modular Controller

HPERAID controllersPCIe 3.0 x8 / 12G SAS

Also listed as: 804331-001, 836260-001, 836260-002, 836260-003, 836260-004, 804334-001, 804334-002 · made by Microchip Technology

The HPE Smart Array P408i-a SR Gen10 is an enterprise 12Gb/s SAS and 6Gb/s SATA modular RAID controller featuring 8 internal lanes and 2GB flash-backed write cache (FBWC). Seating in the dedicated modular controller slot (AROC) of HPE ProLiant Gen10 servers, it leaves standard PCIe expansion slots available while providing hardware RAID levels 0, 1, 5, 6, 10, 50, 60, and advanced data mirroring (ADM). On the secondary market, ensure the 96W Smart Storage battery or capacitor energy pack is present to enable write-back caching.

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Specifications

Part number804331-B21
BrandHPE
Made byMicrochip Technology
TypeRAID controllers
Other numbers804331-001, 836260-001, 836260-002, 836260-003, 836260-004, 804334-001, 804334-002
Statuscurrent
InterfacePCIe 3.0 x8 / 12G SAS
Form factorType-a Modular Controller
Cache (GB)2
Ports8 internal SAS/SATA lanes (2x Mini-SAS HD ports)
Generation fitProLiant Gen10 servers

About the 804331-B21

804331-B21 is HPE's Smart Array P408i-a SR Gen10 Modular Controller, the flagship storage controller deployed across millions of HPE ProLiant Gen10 servers. Engineered on Microsemi/Microchip SmartIOC 2100 silicon, it provides 8 internal 12Gb/s SAS and 6Gb/s SATA physical lanes across two internal Mini-SAS HD ports and includes 2GB of 72-bit DDR4-2133 Flash-Backed Write Cache (FBWC). Supporting hardware RAID 0, 1, 5, 6, 10, 50, 60, 1 ADM, and 10 ADM alongside mixed-mode HBA passthrough, it is the primary storage backbone for enterprise virtualization and transactional storage in Gen10 environments.

Compatibility

This 'Type-a' modular card installs into the dedicated proprietary modular storage slot on HPE ProLiant Gen10 servers including the DL360 Gen10, DL380 Gen10, and ML350 Gen10, connecting directly to the motherboard without consuming standard PCIe riser slots. It connects to internal SFF or LFF drive cages using Gen10 internal Mini-SAS HD cables. Enabling write caching requires an HPE 96W Smart Storage battery (SKU 875241-B21 or P01366-B21). It is electrically incompatible with Gen11 servers (which use OCP or PCIe MR-series controllers) and Gen9 servers. The option SKU is 804331-B21, with spare numbers 836260-001, 836260-002, and assembly number 804334-001.

How to identify a genuine unit

A genuine 804331-B21 module bears an authentic HPE serial label showing option part number 804331-B21, spare number 836260-001 (or -002/-003), and assembly number 804334-001. In iLO 5 and HPE Smart Storage Administrator (SSA), it is authenticated as the HPE Smart Array P408i-a SR Gen10, showing firmware levels, cache module serials, battery charge status, and HPE Secure Encryption capabilities. Unauthenticated clone boards will fail SSA management and trigger POST warnings.

Buying used

Because the P408i-a is one of the most traded enterprise RAID cards on the secondary market, buyers should verify that the removable 2GB FBWC daughterboard is securely seated and that its cache connector pins are straight. Confirm that the sale includes the necessary battery connection cable. Check the card edge contacts for clean gold plating and ask the seller to confirm that Smart Storage Administrator detects all connected drive bays with zero controller lockup events.

Reference prices (last 14 days, updated 2026-10-27)

New: USD 210 (1 sighting, Oct 2026)

Refurbished: USD 206 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comnewUSD 210new in box2026-10-27
globalonetechnology.comrefurbishedUSD 206tested refurbished2026-10-27

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

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FAQ

Does the P408i-a consume a standard PCIe slot?

No. The 'Type-a' designation indicates a modular form factor that connects to a dedicated storage slot directly on the Gen10 system board, leaving all PCIe riser slots free for other expansion cards.

Can the P408i-a operate without a battery?

Yes, but write caching will be disabled or restricted to write-through mode, which significantly reduces random write performance until an HPE Smart Storage battery is connected.

Buying or selling 804331-B21?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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