405835-001 512MB BBWC Cache Memory Module for Smart Array P400 and P400i RAID Controllers

The 405835-001 is a 512MB battery-backed write cache memory module designed for Smart Array P400 and P400i RAID controllers. This 72-bit DDR2-533 cache board provides up to 4.2GB/s of cache bandwidth and can upgrade supported 256MB controller configurations.

An external compatible battery and the correct 16-pin cable are required for protected write-cache operation. This listing includes the cache module only. The controller board, battery and battery cable are not included.

Technical Specifications

• Part Number: 405835-001
• Product Type: Battery-backed write cache memory module
• Cache Capacity: 512MB
• Memory Technology: DDR2-533 SDRAM
• Data Width: 72-bit
• Maximum Cache Bandwidth: Up to 4.2GB/s
• Compatible Controllers: Smart Array P400 and P400i
• Installation Type: Proprietary controller cache daughterboard
• Backup Method: External battery-backed cache
• Compatible Battery Type: 4.8V Ni-MH RAID controller battery
• Upgrade Application: Supported 256MB 40-bit P400 and P400i configurations
• Included: 512MB cache module only
• Not Included: RAID controller, battery or battery cable

Interchangeable / Replacement Part Numbers

• Direct Service Spare: 405835-001
• Assembly Number: 012764-003
• Board Reference: 013126-000
• 512MB BBWC Upgrade Option Reference: 405148-B21

Related Part Number References

• P400 Controller Board Spares: 504022-001, 405831-001
• P400 Controller Kit: 405162-B21
• P400 Controller with 512MB BBWC Option: 411064-B21
• Compatible Battery References: 398648-001, 381573-001
• 11.5-Inch Battery Cable References: 408658-001, 409124-001
• 24-Inch Battery Cable References: 408658-002, 409125-001
• 24-Inch Battery Cable Kit: 417836-B21
• Lower-Capacity 256MB Cache Module: 405836-001
• P400 Controller with 256MB Cache Option: 405132-B21
• P400i Controller with 256MB Cache Option: 399550-B21

The controller, battery, cables, controller kits and 256MB cache module are related components. They are not direct replacements for the 405835-001 512MB cache board.

Related Parts Available

• Controller Board: 504022-001 Smart Array P400 RAID Controller Board
• Compatible Battery: 398648-001 4.8V Ni-MH RAID Controller Battery Pack
• 11.5-Inch Battery Cable: 408658-001 16-Pin Battery Cable
• 24-Inch Battery Cable: 409125-001 16-Pin Battery Cable
• Lower-Capacity Cache Option: 405836-001 256MB BBWC Cache Memory Module
• Complete Controller Kit: 405162-B21 Smart Array P400 SAS PCIe RAID Controller Kit

✅ Confirmed Compatibility

Compatibility follows the installed RAID controller rather than the server model alone. The system must contain a Smart Array P400 or P400i controller with the replaceable cache-board connection.

✔️ Smart Array Controllers: P400 and P400i configurations supporting replaceable 512MB BBWC cache
✔️ ProLiant Blade Systems: BL2x220c G5, BL460c G7, BL465c G7, BL480c, BL490c G7, BL620c G7, BL680c G7, BL685c G6 and BL685c G7 configurations equipped with a P400 or P400i controller
✔️ ProLiant DL100 Series: DL160 G5, DL160 G5p, DL165 G5, DL165 G5p, DL180 G5 and DL185 G5 configurations equipped with a P400 controller
✔️ ProLiant DL300 Series: DL320s, DL360 G5, DL360 G6, DL360 G7, DL365 G5, DL370 G6, DL380 G5, DL380 G6, DL380 G7, DL385 G2, DL385 G5, DL385 G6, DL385 G7 and DL388 G7 configurations equipped with a P400 or P400i controller
✔️ ProLiant DL500 Series: DL580 G4, DL580 G5, DL580 G7, DL585 G2 and DL585 G5 configurations equipped with a P400 or P400i controller
✔️ ProLiant DL700 and DL900 Series: DL785 G5, DL785 G6 and DL980 G7 configurations equipped with a P400 controller
✔️ ProLiant ML Series: ML310 G5, ML310 G5p, ML350 G5, ML350 G6, ML370 G5, ML370 G6 and ML570 G4 configurations equipped with a P400 or P400i controller
✔️ Integrity Systems: BL860c, BL890c i2, rx3600 and supported Superdome 2 configurations using a P400 controller
✔️ LeftHand Storage Systems: P4000 SAN Solutions, P4000 G2 SAN Solutions and NSM Storage configurations using a P400 controller
✔️ StorageWorks Systems: 1200 All-in-One, 1200r All-in-One, 4400 Scalable NAS File Services, All-in-One SB600c Storage Blade, Enterprise File Services Clustered Gateway and Enterprise Virtual Array File Services configurations using a P400 or P400i controller
✔️ Additional Storage Platforms: SB40c Storage Blade, StoreOnce systems, High Availability Storage Server and applicable Data Protection Storage Server configurations using a P400 or P400i controller

☑️ Key Features

☑️ 512MB 72-bit DDR2-533 cache architecture
☑️ Up to 4.2GB/s maximum cache bandwidth
☑️ Direct replacement or upgrade for supported P400 and P400i controllers
☑️ Protects unwritten cached data during power loss when used with a functional battery and the correct cable
☑️ Supports RAID 6 with ADG when enabled by the controller configuration
☑️ Supports online array expansion, logical drive extension, RAID-level migration and stripe-size migration when permitted by controller firmware and battery status
☑️ Module-only replacement allows serviceable controller, battery and cable components to be reused

⚙️ Fit Notes

• This is a proprietary RAID controller cache board and is not a standard desktop or server DIMM.
• Verify that the installed controller is a P400 or P400i before ordering.
• The 512MB module uses a 72-bit design. The 405836-001 alternative is a lower-capacity 256MB 40-bit module.
• Protected write-cache operation requires a functional compatible battery and the correct 16-pin cable.
• A failed, discharged or missing battery may cause the controller to disable write caching even when the cache module is functional.
• Cable length varies by system chassis. Compare the existing cable before selecting the 11.5-inch or 24-inch version.
• The 405148-B21 number identifies an upgrade option that may include additional components. It should not be treated as a guaranteed bare-module-only package.
• Cache modules used by P410, P410i, P411 and later controller generations are physically and electrically different.
• Power down the system and use proper electrostatic-discharge precautions during installation.