Adjusting performance on a vintage processor requires careful techniques.
Adjusting performance on a vintage processor requires careful techniques.
Well there's a really old thread about a very similar situation here: doesn't seem conclusive but the BIOS version appeared to be a factor. In your BIOS, check out the settings available to you. Also, Intel XTU might be a valid OC option if the BIOS is too locked down. It's free, after all.
I located the OC settings in the BIOS, adjusted the clock by 10, and now XTU indicates it doesn't drop below 3GHz.