Originally Posted by Xion X2
It must be your 680i that doesn't like it, because I have a friend w/ Crucial Ballistix DDR2667 who's overclocked his to 1000mhz with 4-4-4-5 timings on a P5B Deluxe w/ a 3.5gHz Allendale.
Crucial's usually a very good, overclockable memory.
The 680i boards are very picky with memory. There's a red sticker outside the box of my P5N32-E SLI that says "due to NVIDIA nForce 680i SLI chipset, Asus only guarentees Dimms on memory QVL (qualified vendors list)".