I am sorry for this inconvenience. As you mentioned, this is not a supported integration not only because of the hardware requirements but also the fact that is not in compliance with the FCC regulations.
Please note that Intel Wireless Adapters are meant to be professionally installed by Original Equipment Manufacturer (OEM) technicians on certified systems only.
Regulatory information regarding hardware installation or upgrade
Intel® WiFi Products - Why doesn't my laptop recognize my new Intel wireless adapter?
In this case we suggest you the use of Intel® Wireless adapters for desktop which are intended for the type of computer you have:
Intel® Centrino® Advanced-N 6205 for Desktop.
Intel® Centrino® Advanced-N 2200 for Desktop.
Thanks for the response. Is it possible to swap out the 6205's card for the 6250, or would I likely get the same results as with the non-Intel pcie adapter?
The Intel® Centrino wireless adapters for desktop should work with your system as it is intended for desktop computers. You may return the 6250 wireless adapter with the seller.