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[PJamison]

The answer, for those who might care: I belatedly realized that I'd flipped the pins so the long ends were going through the DuoX2 and the short ones were mating with the socket. The results: a 5 V pin that was getting three-ish volts. Once I replaced the pins with ones going the right way, all was well with the universe.

[litspliff]

for future reference....the socket goes on the chip, not the motherboard.