I guess my question then is if you can generalize from sequential s-spec values (is that what you're doing?). QRG6 is a 4214, QRG7 is a 4215, QRG8 is a pentium 4?, and QRG9 is 5215. It seems like they're not purely sequential.
Anyways, reading back through the last 10 thread pages, I found...