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I tried overclocking my girlfriend, but her brain's firmware is locked But really, as far as I know, there hasn't been much luck at all with overclocking the memory clocks on the 8970M.

You may not actually need a 5V adapter if your laptop provides clean 3.3V power over ExpressCard. See here: http://forum.techinferno.com/diy-e-gpu-projects/4532-%5Bguide%5D-low-profile-12-lenovo-x220-gtx650%40x1-2opt-pe4l-2-1b.html @Remko78 needed 5V to make his eGPU work because his 3.3V power was insufficient. I was able to get my eGPU working with and without 5V on the floppy molex connection (from my Xbox360 PSU), but settled on supplying 5V to take the load off of the 3.3V line in the EC slot. Without the 5V line attached, the PE4L would reset itself on a restart as well as system shutdown so I didn't have to switch off the eGPU on a restart (could be a benefit if you restart often). YMMV with your particular laptop. See the above link for the symptoms of having an inadequate 3.3V power line if you're getting funky errors while using your eGPU. Good luck!