I am a pc user too, I have laptop dell d630 and I tried this card on windows xp and windows 7 too, everything wokring well with channel 1-13, but only under Mac OSX it does with channel 1-11 only

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Dell Latitude e6500
CPU: Intel C2D T9600 @ 2,8GHz / 1066MHz / 6MB
RAM: 4GB DDR2 800 MHz
VGA: NVidia Quadro NVS 160M 256MB
Sound: (working voodooHDA)
WLAN: Dell Wireless 1510 abgn @ BCM4328
LAN:' Intel
HDD: Samsung SSD 128MB SATA-II
Screen: 15,4" 1920x1200@60Hz
Snow @ 10.6.7