726815-001 726815-002 - 4GB Flash Backed Write Cache Module for Smart Array P440 P840 

Tech Specs

• Type: Flash-Backed Write Cache (FBWC) daughter module
• Capacity: 4GB
• Cache medium: DRAM with NAND flash backup (requires Smart Storage Battery)
• Intended use: Write cache acceleration and data protection on Smart Array controllers
• Controller interface: FBWC cache socket on P-class controllers
• Typical RAID support (via controller): 0 1 5 6 10 50 60 (controller-dependent)

☑️ Key Features

☑️ 4GB write cache for faster RAID performance and reduced latency
☑️ Flash-backed design preserves cached data during power loss (with Smart Storage Battery)
☑️ Drop-in module for supported P-class controllers—no PCIe slot required
☑️ One Smart Storage Battery can back up multiple controllers in the same server

✅ Confirmed Compatibility

(Cache module use on these controllers; SFF/LFF drive bay choice does not affect compatibility)
✔️ Smart Array P440 (4GB FBWC versions)
✔️ Smart Array P840 (4GB FBWC versions)

Server families that commonly use these controllers

✔️ ProLiant DL360 Gen9 · DL380 Gen9 · DL160 Gen9 · DL180 Gen9
✔️ ProLiant ML350 Gen9 · ML110 Gen9
(Controller availability and cabling options vary by system configuration.)

Interchangeable / Equivalent Part Numbers

• FBWC module (this item): 726815-001 · 726815-002 (functionally equivalent 4GB FBWC revisions)

Related Parts (reference only — not included)

• Smart Storage Battery 96W (required for FBWC operation): 727258-B21 (option) · 750450-001 · 815983-001 · 878643-001 · 871264-001 (spares / equivalents)

• Controller kits that ship with 4GB FBWC (not interchangeable with the cache module itself):
  P440 kits such as 726821-B21 / 761872-B21 · P840 kits such as 726897-B21 / 761874-B21 / 784486-001 / 761880-001

Fit Notes

• Requires a Smart Storage Battery to enable and back up write cache. Without the battery connected, the controller will typically disable write-back caching.
• One 96W Smart Storage Battery can back up multiple supported controllers and NVDIMMs within the same server (cable length must match your chassis).
• Use only on supported P-class controllers with an FBWC cache socket (e.g., P440, P840). This module does not convert a controller without a cache socket.
• Firmware alignment is recommended: update system ROM, Smart Array firmware, and drive firmware during installation for best stability.

What’s Included

• 4GB FBWC cache module