Yes.
Also to get any real speed advantages from airport express you would need a wifi n model, i would think it's probably more convenient to use usb wifi than anything.
Possibly you mean @barracuda156 when you say OP?
Reviving this old thread. This sounds intriguing! The BCM94322MC is a standalone 802.11a/b/g/n card. Can someone confirm if there are drivers for this card under Tiger/Leopard? Also, we would need to find a compatible PCIe card with 2 antenna connectors to connect the 2x2 MIMO configuration.
When I did mine, you could get carrier cards with three aerial connectors quite easily. I also got an impressive external tri-cable aerial with 1-2m of cabling to plug into. Something like these pics.
No support was not added until 10.7 lion and believe it first shipped towards rhe end of the cheesegrater(1st gen design) life like around the 2012 Mac Pro timeframe
@Tankerthebuberz bummer! so does that mean I need a Mac Pro 1,1 > 5,1 to support 802.11n, right? Just so that I'm clear:
I have no idea what Tankerthebuberz is trying to say but 802.11n is supported in Leopard and Tiger for Intel. My Macbook Pro Santa Rosa (2007) shipped with Tiger and had a 802.11n card inside. The Mac Pro 1,1 in 2006 came with an optional 802.11n card. That also shipped with Tiger. I have a 1,1 and that runs the faster card. From what I can remember, they ran initially at 802.11g speeds as the cards Apple implemented had not fully passed the 802.11n specification, being somewhat experimental at the time, so Apple released a paid-for firmware update later on to unlock the cards. That caused a bit of a stink at the time. Still four years before Lion was released.
