After placing my Intel Core 2 Duo e6600 (2.4GHz) into unlinked mode from RAM, WinTec industries, and booting my system crashes after about 1 min, into loading all of my programs. But switched to Linked at 2.7GHz runs normal. All voltages are set at auto, predefining does not work good on this motherboard.

nVidia 680i LT SLI
Intel C2D E6600 - 2.4GHz
Wintec Industries 800MHz

Overclocked 5:4 1200MHz FSB Linked to 800MHz RAM (Runs flawlessly)
Default - 1066MHz FSB Unlinked to 800MHz RAM (Crashes after programs boot)

it is updated to the latest, just bought the thing. Lol Well week old. But been running flawless, and I've had the same bored before for a year prior.

There at default of 4-4-4-18-2T and I haven't touched them since I've bought them, because they just do not overclock.

Do you have time to load CPU-Z before it crashes in unlinked mode? If so, you can try to check the actual memory timing to make sure it concurs. I have a 650i board and I know that there is an option in the bios to see the actual mem speed, but sometimes it doesn't give the same reading as cpu-z once windows is running. Maybe try overclocking or underclocking the ram a bit, leaving the timings to auto. Have you tried overclocking the cpu a bit? Anyways, it is surprising that there should be such a difference between linked and unlinked, but as with many computer problems, the actual problem doesn't necessarily need to be found in order to fix it.

CPU-Z will not launch quick enough to find the RAM Timings, but I can tell you they are set at default which is auto across the board.

Yes the settings show, I'll try setting 1:1 settings, pretty sure it will not boot as the fsb is 1066MHz and the ram is 800MHz, will try though.