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[* black] Wireless connectivity is provided by a Broadcom [link|http://www.broadcom.com/products/Wireless-LAN/802.11-Wireless-LAN-Solutions/BCM4331|BCM4331] "wireless solution."
[* black] According to Broadcom, this chip provides "three transmitting and three receiving streams of data in both the 2.4Ghz and 5Ghz bands. Increased number of streams and antennas results in faster speeds, longer range, fewer dropped connections, and better overall wireless coverage."
[* black] The wireless card bracket is aluminum, rather than the plastic in previous revisions. Perhaps this change was made for thermal reasons, as a pink thermal pad is visible, used to transfer heat from the Broadcom chip to the aluminum bracket.