Dell Dimension C521 - Manual (Page 64)

64
Removing and Installing Parts
Memory
If your computer only has one memory module installed on the system board, you can increase your
computer memory by installing an additional memory module.
Your computer supports DDR2 memory. For additional information on the type of memory supported by
your computer, see "Specifications" on page 93.
DDR2 Memory Overview
Your computer has a minimum memory configuration of one DDR2 memory module. This memory
module must be installed in DIMM1. If two or more DDR2 memory modules are installed, they should
be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not
installed in matched pairs, the computer will continue to operate, but with a slight reduction in
performance. See the label on the module to determine the module’s capacity.
NOTE:
Always install DDR2 memory modules in the order indicated on the system board.
NOTICE:
Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.
The recommended memory configurations are:
• A memory module installed in connector DIMM1
• A pair of matched memory modules installed in connectors DIMM1 and DIMM2
1 fan connector(FAN_CPU1) 2 processor socket (CPU) 3 power connector
(PW_12V_A1)
4 memory module connectors
(DIMM_1, DIMM_2,
DIMM_3, DIMM_4) 5 power connector (POWER1) 6 SATA drive connectors
(SATA0, SATA1)
7 front-panel connector
(FRONTPANEL) 8 CMOS reset (RTCRST) 9 battery socket (BT1)
10 internal USB (USB1) 11 PCI Express x16 connector
(SLOT1) 12 PCI Express x1 connector
(SLOT2)
13 PCI connector (SLOT3) 14 password jumper (PSWD) 15 floppy drive connector
(FLOPPY1)