Difference between A7V133 and A7V

What exactly is the difference(s) between these boards? The reason i ask, is because i recently toasted my mobo, and perhaps my cpu also. To test if the cpu was dead, i put my 1900+ palamino into a friends A7V, but the thing did not post? I asked around and people have told me that the board doesn't support XP's, but i am seeing people say that they have A7V133's with XP chips. Can someone please explain if there is a difference in these two boards, and also, if possible tell me if my XP is most likely dead or not?
Your help is appreciated.

The AV7 does not have support for 133 bus. It has the KT133 chip. The KT133A chip that is on the AV7133 supports the 133 bus.

thanks alot for the info, my cpu might be spared!