Sorry, but it clearly states that it DOES NOT support the 955.
You have an older (AM2) board, so it won't support AM2+ or AM3 CPU's.
You can get an AM2+ board for cheap these days, I suggest either the 785 or 790 chipset.
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NemesisChild, thanks for your reply. Yes I've got the point. Just after the list title it says N/A. However the way they provide the support list is a bit strange. Why would you put the not supported CPU into CPU support list and distinguish them with 'N/A' than the others.