I not 100% shure but ,, Any B2 processor will enable the TLB Fix code and thus it will Disable ACC when a B2 chip is installed. The FIX and ACC i dont think go hand in hand on this Mobo.
Notice how you Have TLB FIX option (But No ACC) cause of the CPU's patch code . if i remeber correct.
Also what Version Bios is this? Try 602 and or 703 Bios See if the option Changes. I really think its tied to the 9500's TLB Patch code,, Affects B2chips Only not B3,, So A 9550/9650/9750/9850/9950/PHII940 and up will All Show ACC with No TLB Fix Option..
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