Seemingly stupid question, but what exactly makes an A1181 board a Penryn board? Is it the 3-wall inverter connector and the "straight" heatsync (as opposed to the "curved" heatsync)? I assume the 820-2279-A model (2/2.1/2.2/2.4GHZ line) is Penryn, but I've never been 100% sure.

Or is a "Penryn" board actually the even later A1181 model that has the smaller optical drive connector?

Anyway, just trying to make sense of all the vague and idiotic labels out there that are thrown around constantly but never clearly defined. I always just stick to the model numbers to be safe, but it would be really nice to be able to tell customers, "Yes, this is Penryn!"