I don't think wincpuid tells you the stepping, but it can give you hints by telling you the cpu family. 6-4-2 is for older t-birds, 6-4-4 is for AYHJA and newer. Not sure what Pal's family grouping is, or any newere steppings than AYHJA. If you want to know for sure, scrape the goop off the CPU, but I wouldn't take the HSF unless you have a reason to (new HSF, you are gonna lap your HSF, or u just got some AS2 and want to put it on).
Chiz