2 Technical Reference
Main Memory
58
English
Main Memory
The main memory in your PC consists of Double Interline Memory
Modules (DIMMs). 32 MB or 64 MB are fitted as standard (depending
on the model you ordered). The main memory can be upgraded to a
maximum of 512 MB. Memory modules are available in three
capacities: 16 MB, 32 MB and 64 MB. The maximum memory capacity
(512 MB) is obtained by installing eight 64 MB DIMM modules.
NOTE
The DIMM modules used by your HP Vectra XU PC use a 5 volt power
source. DIMM modules that use a 3.3 volt power source are not
supported and must not be installed.
128-bit Memory
Each DIMM module stores 64 bits of data plus 8-bits of Error
Correcting Code (ECC) code. Access to the memory modules is
controlled by a memory controller on the processor’s local bus. This
controller manages the modules in pairs to create single, 128-bit wide
logical banks.
Memory bank 4
Memory bank 3
Memory bank 2
Memory bank 1
128-bits
Processor’s local bus (64-bits)
Memory
controller
DIMM memory modules
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