The X50 416MHz, which has a 3.5-inch, 320x240 pixelLCDscreen, a 416MHz processor, 64MB of RAM, 64MB of Flash ROM, Compact Flash and SDIO expansion card slots, and Bluetooth.
The X50 520MHz, which has a 3.5-inch, 320x240 pixelLCDscreen, a 520MHz processor, 64MB of RAM, 128MB of Flash ROM, Compact Flash and SDIO expansion card slots, 802.11b WiFi, and Bluetooth.