Factory overclock, and in those days Motorola could probably have given them a batch of mid-development DSP chips (sort of proto 56002) that could clock much higher and still sit on the unmodified motherboard, max out the scratchpad memory, etc. Then the add-on cards. Anything that was potentially involved in nuclear response decisions probably could get a lot of budget. It would be interesting to inspect the hardware that still exists to see if there are any signs of what exactly actually happened.