Is this AE card N speed? 2006 iMac Wireless Card Type: AirPort Extreme (0x14E4, 0x87)

[olnacl]

The DL speed (downloaded a couple 155 MB files) is about half that of a MBP (late 2007) on th same wireless network, right near the router and though it's showing a measly 500 kbps DL speed running Speed Test, the speed matches the MBP when I connect the iMac by ethernet cable (35 KB/sec vs 80 KB/sec)
Router is set for 802.11n (802.11b, g compatible). I googled and didn't find anything definitive.

AirPort Card Information:

Wireless Card Type: AirPort Extreme (0x14E4, 0x87)
Wireless Card Locale: USA
Wireless Card Firmware Version: Broadcom BCM43xx 1.0 (4.170.46.9)
Current Wireless Network: Apple Network 8a2876
Wireless Channel: 2