Why is iMac connected to TC at 130 Mpbs instead of 450 Mbps?

Hi, I just noticed that my mid 2010 iMac 27" is connected to my 2nd gen Time Capsule at only 130Mpbs. I remember seeing it at around 450 Mbps or slightly lesser before my upgrade to Mountain Lion a couple of weeks back. The thing is, my TC is located about 3 inches away from the iMac. I can't use the wired ports because they are maxed out.
Is this normal behaviour? Or is the fault with my TC? I don't want to create a separate SSID for the 5GHz channel.

There are several factors that slow a 5 Ghz 802.11n network, like RF noise, packet traffic congestion, etc.. By default, the AirPorts broadcast both a 2.4 GHz and 5 GHz using the same network name, or SSID. To "force" a device to use the 5 GHz signal you would need to enable the 5 GHz Network and Radio Mode for 802.11n only (5GHz)
In the Airport Tab, select "Wireless"
Click the "Wireless Network Options..." button
Check the box for 5GHz network name
With the Option key held down, click Radio Mode and select 802.11n only (5GHz) band

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