Tony said:
I will do some research but my HP manuals do not agree with these reviews.
They say that both are the same speed and the memory sizes are as I posted.
I do not believe you can add a duplexer.
I will certainly look into this further.
Tony
From
http://www.pcpro.co.uk/reviews/1786/hp-laserjet-4050tn.html
"Processing power has been beefed up from 100MHz to 133MHz,
standard memory has doubled to 16Mb and print speed increases
marginally from 16ppm to 17ppm."
from the HP LaserJet 4000/4050/4000N/4050N/4000T/4050T/4000TN/4050TN
Printers Getting Started Guide Manuals:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl03782/bpl03782.pdf
http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl03783/bpl03783.pdf
http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl06794/bpl06794.pdf
http://h20000.www2.hp.com/bc/docs/support/SupportManual/bpl06903/bpl06903.pdf
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bpl03756
"The HP LaserJet 4000 comes standard with 4 MB RAM and one 500-sheet tray.
"The HP LaserJet 4050 comes standard with 8 MB RAM and one 500-sheet tray.
"The HP LaserJet 4000N comes standard with 8 MB RAM, an HP JetDirect print
server card for connecting to a network, and one 500-sheet tray.
"The HP LaserJet 4050N comes standard with 16 MB RAM, a HP JetDirect
10/100Base-TX print server card for connecting to a network, an HP
Fast InfraRed (FIR) Receiver, and one 500-sheet tray.
"The HP LaserJet 4000T comes standard with 4 MB RAM and two 250-sheet trays.
"The HP LaserJet 4050T comes standard with 8 MB RAM and two 250-sheet trays.
"The HP LaserJet 4000TN comes standard with 8 MB RAM, an HP JetDirect print
server card for connecting to a network, and two 250-sheet trays.
"The HP LaserJet 4050TN comes standard with 16 MB RAM, a HP JetDirect
10/100Base-TX print server card for connecting to a network, an HP Fast
InfraRed (FIR) Receiver, and two 250-sheet trays."
There may also be a difference in hard drives between the two.