Hey Giz,
wow, with your experience, thought you might be the one to answer such a question.
For a p55 ("5 series") chipset, the most recent INF on Intel's website is
* Product: Intel(R) Chipset Device Software
* Release: Production Version
* Version: 9.1.1.1019
* Date: August 18 2009
So, XXX.1020 is more recent. And, doing a search for xxxx.1020 only finds what looks like another post from you.
http://www.neowin.net/forum/index.php?showtopic=832644
I don't find v1020 at all on Intel's web site, or elsewhere either.
Anyway, looks like you are way up to date with that.....
GL
NX