raynisthebeast

Just bought a new pc, and it only has 256mb RAM, I found this on the packard bell website

System Memory
Four 184-pin DDR SDRAM DIMM sockets.
Serial Presence Detect
Support for single-sided or double-sided DIMMs (DDR 333 / DDR400)
Support for up to 4 GB system memory
Non-ECC RAM (ECC memory will run in non-ECC mode)
Single and dual channel mode operation:
Single channel mode with single DIMM, non-symmetrical population or non-identical DIMMs
Dual channel mode with 2 or 4 identical DIMMs, populated symmetrically

Can anybody tell me what it means, and give suggestions on what RAM to buy, because I cant make head or tail from it.