The Paperwhite has a 1Ghz processor and 512MB of RAM (an increase from the second generation's 256MB). It uses 2.4 GHz 802.11b/g/n Wi-Fi, or 3G data to download ebooks to its 4GB of internal storage.
The tablet uses a six-inch Carta E Ink touch screen, with a resolution of 1,448 by 1,072 and 300 pixels per inch. The screen is also glare free so you will be able to read in direct sunlight, on the subway or anywhere else you can imagine.