If only there was a document published by the manufacturer of every motherboard which listed minimum BIOS versions and PCB versions required to support CPU's...Oh wait, there is, called CPU Support Lists, which in your case is
here, which says the 8320 requires P2.00
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Crosshair IV Formula, Phenom II x4 965 w/ Corsair H60, 8 GiB OCZ Platinum DDR3 1600, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64