Only 5.5 Mbit with a Aironet 2600 AP

Hi,
we have some (2) HP Notebooks with a Broadcon 4313 b/g/n WLAN Chip and use the latest drivers (2012). This Chip can provide up to 72 mbit/s with 2,4 ghz.
If we connect this notebooks to a Aironet 2600 AP (10 feet distance) the Windows 7 WLAN Dialog shows 72 Mbit/s for 3 seconds and than only 5.5 Mbit. Others (newer) Laptops show 450 Mbit. The WLAN works with WPA2/AES and PSK. The speed doesn't go up, if we copy a big file to the laptop.
Any Ideas?
Here is the Linktest from the AP to Client (from the WLC 2504 Webinterface):

The card in question is a 1x1:1 so at best will be the 72 or so. Based on your atachment it looks like its connecting only at g rates. I assume you have n enabled on the 2.4 network based on your responses.
Client will step down to lower rates when there is interference. But this seems odd that it would be only 5.5.
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

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