Printing

• The MP640 produces output faster. The MP640 prints a 4-inch by 6-inch photo in 20 seconds, and the MP620 prints the same size photo in 41 seconds. The MP640 supports automatic duplex printing. The MP620 will print duplex prints, but the user must manually remove the printed paper, flip it over and refeed it into the printer. The print resolution is the same for both printers, but the MP640 can print faster because it has 4,416 nozzles compared to only 2,368 nozzles in the MP620.
  
  

Copier

• The MP640 supports automatic duplex copies, whereas the MP620 can only produce single-sided copies. Both printers feature the following copier settings: Auto Exposure/Intensity Copy, Face Brightener/Fading Correction, Fit-to-Page, Image Repeat, Manual Color Adjustment, Multiple Copy -- 1-99 pages, Photo Reprint, Preset Copy Ratios and Zoom.
  
  

Scanner

• The MP640 features higher-resolution scanning. The scanner optically scans at 4800 by 9600 dpi. The MP620 only scans at 2400 by 4800 dpi. Both scanners will interpolate the scanned data to 19,200 by 19200 dpi. Both scanners include the following settings: Auto Scan Modes, Gutter Shadow Correction, Network Scan, Push Scan, and Scan to Memory with a maximum document size of 8.5 inches by 11.7 inches.
  
  

Other Features

• The MP640 has a sheet feeder holding 150 sheets of paper in addition to a cassette holding another 150 sheets of paper. The MP620 only has the cassette for 150 sheets of paper. Also, the MP640 has a 3-inch color LCD, while the MP620 has a 2.5-inch color LCD. Other features included in both printers are Wi-Fi, Bluetooth, Ethernet, and USB connectivity, support for most types of media cards, and numerous photo enhancement and printing software features.