IBM ServeRAID 8k SAS Controller

Features:

256 MB DDR2 533 MHz
Enables 72 hours of battery life for 3 years at 45°C
RAID-0, 1, 1E, 10, 5, 6,
Copyback
FlashCopy
Stripe-unit size: 16 KB, 32 KB and 64 KB, 128 KB, 256 KB, 512 KB, and 1024 KB

Visual identifiers:

The option is shipped as a special memory DIMM with a battery attached through wires (for battery-backup purposes)
The DIMM is installed in a special DIMM socket in supported servers
Five DRAM chips on the DIMM
FRU on label is 25R8076; Stamped “Adaptec ATB-200″ on battery side
Write-back cache memory is 256 MB, 533 MHz DDR2 unbuffered memory
Battery is connected to the DIMM by wires and is typically mounted on the server chassis