The key difference between the two models is that the B4550 also accomodates
high-capacity toner cartridges while the B4500 can only use standard toner cartridges.
  * As fast as 24 ppm print speed; 5.0-second time to first page**
  * Energy Star® compliant Clear, crisp 600 x 2400 dpi output
  * Separate toner and image drum configuration for lower operating costs
  * 266 MHz PowerPC processor
  * Upgradable to 288 MB memory1
  * Up to 7,000-page toner capacity2
  * Fully-enclosed 250-sheet paper tray to keep paper clean and free from curling
  * Optional 500-sheet 2nd paper tray
Coast to Coast STL > Products > Oki > Printers > Mono > B4500/4550 Series
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