PQFP
plastic quad flat pack
PSDB
power-supply distribution board
PS/2
Personal System/2
PXE
preboot execution environment
RAID
redundant arrays of independent disks
RAC
remote access controller
RAM
random-access memory
RCU
Resource Configuration Utility
REN
ringer equivalence number
RFI
radio frequency interference
RGB
red/green/blue
ROM
read-only memory
rpm
revolutions per minute
RTC
real-time clock