HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 167

Setting Up Disk Array Caching
Table 4-6 SIMM Sizes for the Disk Array
SIMM sizes
8 MB 4 x 4 MB (4 A3235A SIMMs)
16 MB 8 x 4 MB (8 A3235A SIMMs)
32 MB 4 x 16 MB (4 A3234A SIMMs)
64 MB 8 x 16 MB (8 A3234A SIMMs)
Setting Up Disk Array Caching 4-31