Differences between these two devices can quickly be reduced to five major areas:

• The size of the display: 9.7 inch for the Kindle DX, 6 inch for the PRS-505
• Connectivity: Free wireless for the Kindle DX, connection through a computer for the PRS-505
• Storage space: 4GB internal for the Kindle DX, 128MB internal for the PRS-505, accepts external flash cards for additional storage
• Keyboard: The Kindle DX has a full text keyboard, the PRS-505 doesn’t
• Read To Me: The Kindle DX can read books aloud, the PRS-505 can’t

The Kindle DX is much better suited for reading newspapers and magazines without having to scroll around the display. In addition, PDF documents are much easier to read on the Kindle DX – on the PRS-505 they are reduced to fit the 6″ screen, and even when zoomed to maximum magnification the print is too small to read comfortably.

As for connectivity, the Kindle DX comes with free wireless connectivity for downloading books as well as for browsing the Internet. The only way to get content into the PRS-505 is via a connection to a personal computer (running Windows, the software doesn’t work on Macs). In addition, there are more books available for the Kindle DX and their cost is usually lower. Amazon also provide over 5,000 free books that you can download for free from Amazon and over 25,000 books that you can get at the price of under $1 for the Kindle device.

The storage issue is probably one of personal preference, but with the PRS-505 you have to buy and keep track of all those tiny flash memory cards. The Kindle DX has enough built-in storage to last for years – plus Amazon gives you free backup on Amazon.com of any book you purchase – you can download it for free at anytime.

As for the keyboard issue, this means that you can makes notes and annotations on your Kindle documents, but you can’t on the PRS-505. The only other major differences between the two devices are the price and that, due to its smaller size, the Sony Reader PRS-505 is a little easier to carry around than the Kindle DX. If either of these is a problem for you then you should consider the Kindle 2 (read our Kindle 2 vs Kindle DX) – it costs around the same as the PRS-505 but it has many of the extra features of the Kindle DX.

The following table compares all the difference between the Kindle DX and the Sony Reader PRS-505:

	Amazon Kindle DX	Sony PRS 505
Outlook
Size	10.4" x 7.2" x 0.38"	6.9" x 4.8" x 0.3"
Thickness	0.38"	0.3"
Weight	18.9 oz	9 oz
Display	9.7" E-Ink 1200 x 824 resolution 150 pixels/inch 16 level gray scale	6" E-Ink 600 x 800 resolution 167 pixels/inch 8 level gray scale
Screen	Auto-Rotating, as you turn the device	Not Auto-Rotating
Storage	4GB (3.3GB for user content, about 3,500 books)	256MB (210MB for user content, with expansion slot)
Product Link	Kindle DX Best Price	Sony PRS-505 Best Price
Customer Feedback	Feedback on Kindle DX	Feedback on Sony PRS-505

So what do these differences mean? The Kindle DX allows you to read magazines, newspapers and textbooks without a lot of scrolling around. In addition, you can read PDF documents at full-size. So if you’re a commuter or frequent traveler, a professional who carries around a lot of documents or a college student, the new Kindle DX is ideal for you. The Kindle DX especially makes sense for college students, as about 60% of textbooks will soon be available for wireless download – and at a cost considerably lower than their print counterparts.

On the other hand, it’s possible that the smaller size (and/or price) of the Kindle 2 appeals to you. If you like to carry your reader around in a purse or a jacket pocket, then you probably should opt for the Kindle 2. The storage difference between the two devices is probably not an issue for most people, since the Kindle 2 has enough storage for more than 1,500 books to begin with. On the other hand, if you’re a researcher or someone else who needs instant access to a lot of material, the extra storage in the Kindle DX could come in handy. Read this review and you should be able to decide which one to get: Kindle 2 vs Kindle DX

And remember for both the Kindle 2 and the Kindle DX, there are over 5,000 free books that you can download for free from Amazon, and over 25,000 books that you can get at the price of under $1.

The following table compares all the difference between the Kindle DX and the Kindle 2:

	Amazon Kindle DX	Amazon Kindle 2
Outlook
Release Date	10 Jun, 2009	24 Feb, 2009
Size	10.4" x 7.2" x 0.38"	8" x 5.3" x 0.36"
Thickness	0.38"	0.36"
Weight	18.9 oz	10.2 oz
Display	9.7" E-Ink 1200 x 824 resolution 150 pixels/inch 16 level gray scale	6" E-Ink 600 x 800 resolution 167 pixels/inch 16 level gray scale
Screen	Auto-Rotating, as you turn the device	Not Auto-Rotating
Storage	4GB (3.3GB for user content, about 3,500 books)	2GB (1.4GB for user content, about 1,500 books)
Battery Life	Wireless ON: Up to 4 Days Wireless OFF: Up to 2 Weeks	Wireless ON: 1 Day Wireless OFF: 1 week
PDF Support	Native PDF Reader	Native PDF Reader (latest update)
Product Link	Kindle DX Best Price	Kindle 2 Best Price
Customer Feedback	Feedback on Kindle DX	Feedback on Kindle 2

Below is a size comparison between the Kindle DX and the Kindle 2: