What are the main differences between the VX1410A and the VX1420A?

What are the main differences between the VX1410A and the VX1420A?

The VX1420A has a single DC blower fan while the VX1410A has two DC tubeaxial fans. The fans are housed in an easily removable fan pack located on the back of the mainframe. The VX 1420A blower fan significantly increases the cooling capacity of the mainframe. Both the VX1410A and the VX1420A come with the enhanced monitor as a standard accessory. The 20-digit alphanumeric front panel display is a standard accessory for the VX1420A, and an optional accessory for the VX1410A.