NB - The BBWC is designed to fit to a special place inside certain HP servers.
In other servers the BBU will be loose, or you can figure out somewhere to place it.
The HP SMART array P410 is HP's PCI Express 2.0 (PCIe) Serial Attached SCSI (SAS) RAID controller. The low profile, half height Card has 8 ports and utilizes DDR2-800 memory. The P410 is ideal for RAID 0/1, 1+0, 5+0 and can be upgraded with the 512MB battery-backed write Cache (BBWC) module and SMART array Advanced via license key for RAID 6 &, 6 +0.
What's new
6G SAS and 3G SATA support
RAID 50 and 60
Improved battery life (48 hours)
SATA NCQ for all controllers
Additional Features via Software upgrade – SMART array Advance Pack (SAAP)
Introducing the SMART array P410 available now with the latest in I/O slot technology and entry level grade features.
Entry Level Performance
8 internal ports of +6Gb SASA compatible
x8 PCI-Express I/O connector
DDR-2/800 memory
512MB Battery-Backed Write Cache (BBWC) upgrade options
Reliable
Standard RAID 0,1, 1+0, 5, 5+0
RAID 6, 6+0 support with BBWC and SMART array Advanced Pack (SAAP) license key
Flexible
Supports SAS and SATA disk drives
Manageable
Online Drive Flash
Remote monitoring and configuration
Mirror Splitting and recombining w/SAAP
Ideal for...
SAS based servers that require
File/Print
General purpose applications
Domain controller
Application Servers
Dedicated applications
What's New
512MB Flash Backed Write Cache (FBWC)
1G Flash Backed Write Cache (FBWC)
Models
HP Smart Array P410 Controller
HP Smart Array P410/256MB Controller
462862-B21
HP Smart Array P410/512MB with BBWC
462864-B21
HP Smart Array P410/512MB with FBWC 578230-B21
HP Smart Array P410/1G with FBWC 572532-B21
Upgrade Options
Optional Upgrades 512MB BBWC
462967-B21
Battery Kit upgrade
NOTE: To enable BBWC on the 256MB cache. 462969-B21
512MB Flash Backed Write Cache 534916-B21
1G Flash Backed Write Cache 534562-B21
HP Smart Array Advanced Pack No Media 1-Server license including 1yr 24x7 Technical Support
NOTE: This part number can be used to purchase a single license or to order multiple licenses with a single activation key. Customers will receive a license entitlement certificate via e-mail. The license entitlement certificate must be redeemed online or via fax in order to obtain the license activation key(s). Include one year of 24x7 HP Software Technical Support Services.
NOTE: A license key and a minimum of 256MB cache with battery kit or FBWC are required to enable features. For more information go to: http://www.hp.com/go/saap 516471-B21
i think that this controller will be my new investment FULLY custom.
in other words.. the 9260 with 1G cache and.. AND custom queue depth..
Changing the controller cache ratio
The controller cache ratio setting determines the amount of memory allocated to read and write
operations. Different types of applications have different optimum settings. You can change the ratio only
if the controller has a battery-backed cache (because only battery-backed cache can be used for write
cache) and if there are logical drives configured on the controller.
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FULLY custom. 
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