I finally was able to complete bootup without screen artifacts by increasing pci-e bus speed from 100 mhz to 148. At 150 there were a lot of screen artifacts and the computer didnt finish the boot sequence, at 149 finished boot up but with screen artifacts.
However with complete boot up the infinity pro was not found by the hardware manager. Instead a realtek audio dialogue popped up asking what i had plugged into the onboard sound. i removed the realtek drivers and still no recognition of the intensity. I removed and re-installed the intensity drivers (most recent). Still no indication of the presence of the card in control panel. Changed slots again for the card.
In short, presence of the card in any slot at pci-e 100mhz hangs bootup. At 148 mhz bootup completes but card is not recognized in any slot by computer.
Although card successfully installed in someone elses computer I will try yet another system to determine whether i have a defective card. I am starting to look for recommendations for a different card …
BTW – i havent seen anything in bios specifically related to crossfire.