Mac Pro (Early 2008) 820-2128-A Mobo Question

So I ordered a couple 3.2GHz Xeon's for my 820-2128-A motherboard, and rummaging around on eBay noticed there's a 820-2128-B motherboard as well, that's supposed to be for the 3.2GHz chip. I can't seem to find any information on if my -A board will support the 3.2GHz chip now, though I swore I saw someone using the X5482's on the -A board before.

Has anyone with a 2.8GHz board successfully upgraded theirs to 3.2GHz? I'm wondering what the difference might be between the A and B as they...

Mac Pro (Early 2008) 820-2128-A Mobo Question