What is on the motherboard shouldn't make any difference. Also if you're not using the onboard NIC then it can be disabled in the bios and then there won't be any compatibility issues between the two.
I was right in the middle of checkout, when it occurred to me that I should check what the vendor lists for OS compatibility. It turns out that they don't specify 64-bit for Windows 7. (they do for XP and Vista)
So now even though the manufacturer may say it is, I can't order until I see that the vendor will back the product if it winds up not working.
So I sent them an email, and i'll have to wait and see what they say.
I wouldn't think the motherboard chipsets should matter either, but I found a lot of people with Gigabyte boards having the same problems. Whether their right or not as far as the whys, is somewhat irrelevant. The boards seem to be a problem. And it's not just Gigabyte boards. On Newegg, I found quite a few posts of people saying that a given card was simply not working with Win7 64-bit.
This is the belkin I use and it's outstanding. But I also have had good luck with PCI cards with whip antennas off the back.
Belkin F9L1101 N600 Wireless N Dual Band USB Adapter - Up to 300Mbps, 802.11n, USB 2.0 at TigerDirect
Quote