To manually set the timings, you would need to do it manually in the motherboard BIOS.
12 Gb of ram causes issues because the memory controller is part of the CPU, and there are a number of internal timings that are based off the bclock, so loading it up with more RAM to control + increasing the bclock tends to increase stability problems.
More than 6Gb of ram is pretty much worthless if you are not going to be doing a bunch of stuff like rendering, compiling, running virtual machines, etc..
For normal tasks and gaming, 6 Gb of ram at higher Mhz and tight timings is > 12Gb at lower Mhz and loose timings.
You also need to back off that 1.8v dram voltage. The maximum "safe" voltage per Intel is 1.65v. Going higher risks damage to the memory controller onboard the CPU.
The CPU VTT voltage needs to be within 0.5v of the dram bus voltage also.
I just noticed you have your CPU VTT voltage set at 1.5v!
That is a huge source of the excess heat your CPU is putting out.
Try backing down to 1.3v on the CPU VTT, maybe 1.35v if you are sticking with the 12 Gb of ram.
There are a number of pretty detailed guides floating around for overclocking the i7-920 that will detail all this.
Yes, scrap the peltier on the radiator idea...Edited by Caleal - 1/4/12 at 8:43pm