I downloaded/compiled the version of cgminer that was forked specifically for these, and it seems to be working now...
[P]ool management [S]ettings [D]isplay options [Q]uit
GSD 0: 6D7535A44857 750 MHz | 317.7K/320.0Kh/s | A:3072 R:0 HW:0 WU:0.8/m
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VVVV That's the same one I'm using.