HP Surestore Disk Array 12h and FC60 - Manual (Page 259)

Upgrading Controller Cache to 512 Mbytes 259
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Table 32 Controller Cache Upgrade Kit Selection
Initial controller configuration Cache Upgrade Kit(s)
Dual controllers, each with two 128 MB
DIMMs Two A5279A kits
Dual controllers, each with one 256 MB
DIMM One A5279A kit
Single controller with two 128 MB DIMMs One A5279A kit
Single controller with one 256 MB DIMM One A5279A kit (only one of the
DIMMs will be used)