From what I can gather from your post if you set the ram that's 9-9-9-27 to 9-9-9-24 while running it with the 8-8-8-24 and it's fine but running it at 9-9-9-27 crashes. It's most likely due to the mix match of the 24 and 27 setting. So you should run the ram at 9-9-9-24.
Thanks, then I'll stay with 9-9-9-24.
i7 920 D0 4.0Ghz
bclk 191x21, vcore 1.23v qpi/vtt 1.23v cpupll 1.8
18GB DDR3 1600mhz Hyperx (3x2G 3x4G)
Asus P6T Deluxe V2
2x 5870 Crossfire.
[Still testing stability, so far able to pass IBT Very High 10 passes)