Northbridge

Memory controller hub

I/O controller hub

VGA

Ram Access Memory

Random Access memory

Randomly Access Memory

Random Acceptor Memory

DDRAM

DRAM

ROM

SROM

Double Data Range

Double Data Rate

Double Double Rate

Dual Data Rate

800-1600 Mt/S

700-800 Mt/S

600-1800 Mt/S

1800-2500 Mt/S