E8400 + P5Q-Pro + 1066Mhz RAM OC'ing

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Try uping the northbridge voltage a little bit. it should help with the RAM.

4-4-4-12 timings are too tight w/ DDR2-1066 at 910 MHz without excessive voltage, including vNB (vMCH) and Vdimm. Instead of trying to tighten the primary timings at that frequency, change the NB strap from 333/667 (1:1 divider) to something like 333/800 (5:6 divider) for an effective DRAM freq. of 1092 MHz at 5-5-5-15 or a tRAS of 18 and 2T. Then work on tightening the sub-timings, Performance LVL (tRD), Clock Crossings (more aggressive), etc.

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Overclocking is all about experimentation. For example make note of the Read, Write, Copy, and Latency results in Everest at the current 5:6 divider; 5-5-5-15-2T timings. Next change to a 1:1 divider at the same FSB, and w/ the same timings of 5-5-5-15 or a tRAS of 12, and recheck the results in Everest at the new FSB : DRAM ratio.

Your results so far are very impressive, as long as the system is stable at that clock... an E8400 at 4.1 GHz and 1.33 Vcc w/ an effective DRAM frequency of 1092 GHz; 5-5-5-15-2T. Depending on your cooling, ambient temp's, and the VID of your chip, I wouldn't hesitate increasing the Vcc to 1.4 - 1.42v on air. Use Real Temp to monitor Distance to TJMax, and keep it below 25 - 30C. Increase the FSB using the same 5:6 divider, running Memtest86+ after each increase to check for RAM stability, with the subsequent increase in DRAM fequency.