Pulled this off of Abit's main support NG 6/30...it *is* legit.

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Would you please upgrade your BIOS to RY please? I think your BIOS is too old to identify Thunderbird properly. Basically, Thunderbird's electronical specifications are slightly different from previous K75, and its timing tolerance is beyond KX133's response timing. We aren't fully confident that any Thunderbird could run flawlessly on every KA7. But with latest BIOS and some adjustment in BIOS, it might help.
Please set these options in BIOS as following list:
CPU Pull Up Strength = 0
CPU Drive Strength = 1
TechSupport, FAE Department, ABIT
support@server2.abit.com.tw