Did you bought a real Apple card? Like this that I've bought two, and works nicely?I connected wires 0 & 2, with #1 tucked under the card, the same as the 2006 airport card. With both 94322 cards, system profiler shows it as a "Third Party Wireless" instead of Airport Extreme.
https://www.ebay.com/itm/Apple-Airport-Extreme-BCM94322MC-Wireless-WIFI-PCI-E-Card-For-Mac-Pro-MB988Z-A/391513347299?epid=857633264&hash=item5b280394e3:g:VigAAOSw-INa7SRf&_sacat=0&_nkw=Apple+BCM94322MC&_from=R40&rt=nc&_trksid=m570.l1313
Code:
Card Type: AirPort Extreme (0x14E4, 0x8E)
Firmware Version: Broadcom BCM43xx 1.0 (5.106.98.102.30)