XMP doesn't work on my core i7 above a 160 base clock

[nonxcarbonx]

Core i7 920
Foxconn Renaissance Motherboard
3x2GB 1600mhz DDR3 Patriot Viper RAM
Latest BIOS, DIMM @ 1.65 V

Above ~160, my xmp wont post. The system works fine when I use x6 multiplier and x14 uncore or auto, but not this xmp. I'm currently using a base clock of 200, and I can't get xmp to run and therefore am stuck with 1200mhz ram (x6 and x14). HELP!!!

 

[nonxcarbonx]

I've also noticed that when xmp is on, cpuz says it's running 6-6-6-18, not 8-8-8-24.

 

[taltamir]

reset the bios? manually adjust settings? Don't overclock this high? I am not quite sure I understand your problem.
XMP is a type of expensive ram I am assuming?