Looking at the site I'm thinking you're SOL for every but the E7300 which apparently is currently undergoing testing.
As an end-run I had a look at the bios' page in the hopes that maybe their cpu compatability chart hadn't been updated for a while, but there's nothing in the new bios pages suggesting that a new version will run a quad.
Best bet would be to sell the motherboard & cpu as a matched set and put the money towards a new board.
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