You need to post all your bios settings. If you're on the 266 strap, you're most likely working with the 4:5 divider (FSB 1000RAM 1200) - if this is the case then you'll need to run performance level 8. Also advance clock skews to 300 for both A&B channels. Leave Ai ClockTwister and DRAM Static Read Control at AUTO.
If your divider is 2:3 (FSB 800: DRAM 1200) - you may be able to run Performance Level 7 depending on RAM, NB, Vdimm.
Best thing, post all your settings.
Edit: What bios are you using?
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