Hardware site AnandTech has posted an extensive review of the fifth generation AirPort Extreme base station and the fourth generation Time Capsule, and while you may not want to read the entire 9-page review, it's worth popping to the end, where author Brian Klug explains how an internal hardware change (from Marvell to Broadcom) gives these new models improved throughput and range. follow link
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New AirPort Extreme and Time Capsule Feature Improved Throughput
Check out the Take Control ebooks that expand on the topic in this article:
Read real-world advice from Wi-Fi wizard Glenn Fleishman on setting up a wireless network using Apple's 802.11n and 802.11ac base stations. Learn to maximize performance, extend range, connect multiple base stations, handle complex configs, share USB disks and printers, and more.