Many thanks to manofthem for sending me a CrossfireX bridge which arrived today. Now to get CrossfireX working between a 7970 and 7950 without my computer freezing after 5 minutes of 3D activity. I'm bringing my former main 3770K rig back home to further troubleshoot the !@#$ out of my Haswell rig, as I was up until 5AM installing Win7 on a terribly slow 250GB drive (scores 3.3 in WEI), only to find my problem unresolved. I'm leaning towards a hardware problem but I won't know until I swap PSUs and stuff.