HP LaserJet 4000
The HP 4000 comes standard with 4MB RAM and one 500-sheet tray.
HP LaserJet 4000N
The HP 4000N comes standard with 8 MB RAM, an HP JetDirect card for connecting to a network, and one 500-sheet tray.
HP LaserJet 4000T
The HP LaserJet 4000T comes standard with 4 MB RAM and two 250-sheet trays.
HP LaserJet 4000TN
The HP LaserJet 4000TN comes standard with 8 MB RAM, an HP JetDirect card for connecting to a network, and two 250-sheet trays.