This Forum Beta is ONLY for registered owners of D-Link products in the USA for which we have created boards at this time.
Intel says it supports...http://www.intel.com/network/connectivity/products/wireless/adapters/5000/index.htm
The adapter needs to use both of the bandwidths in order to get the 300 speed. Since the 655 is 2.4 only you won't see 300 with it.
To acheive 300Mbps, you need to have the channel width set to 20/40 and use WPA2/AES encryption.
That is absolutly not true. In fact we do not make an adapter that runs 2.4 and 5 at the same time. To acheive 300Mbps, you need to have the channel width set to 20/40 and use WPA2/AES encryption.