Phase 2

Well Intel through a loop on the last phase. They lock the internal clock multiplier on all chips except the engineering samples so that people like me can not overclock the chip (If anyone knows where to get engineering samples please let me know). This is a big problem because it means that to 2X the speed of the CPU I can not just tell the chip to run at X faster internal clock.

I thought about just ditching the Intel platform and going with AMD (they do not lock their chips), but I have not found a dual processor AMD board and I very much want 2 CPUs clicking along at 1GHz. So, back to the Intel boards, the only way I know to overclock the chip is to increase the speed of the system buss of my ABit motherboard. This should work because the clock multiplier is locked to system buss. The downside of such approach is I have no idea if the motherboard, memory, video card, etc. can be clocked to 200 MHz even if it is cooled to -120° C, but I am going to give it a try.

The plan is to submerse the motherboard in a high dielectric liquid and then chill the liquid down to -120° C. I found a 3M product called 3M Fluorinert, It has high dielectric strength and an extremely low pour point of -101° C. The problem is 5 gallons of this stuff is over $2500. It is not that I am not prepared to spend that, but I don't even know if this would work. I started search for a liquid that I could use as a substitute, I found several that had high dialectic strength, but they also had high port points. One day I was looking through my Grainger catalog and ran into the Mobil compressor oil section. I ran into Rarus824 it has a pour point of -60° C, sure it is no where near -120° C, but it will get me started. I also figured that I may be able to make up the ~55° C with TECs.

Of course I was not able to use the same evaporator to chill the liquid, so I had to come up with something else. I did not want to spend a lot of time building one so I looked for something off the shelf. I started looking at transmission coolers. I found one from Flex-a-lite, put on some new connectors and added a CPE valve.

This is what everything looks like put together.

Well I am having problems with the suction pressure on my condenser. I need it to be about 20 Hg, but currently it is about 3 PSI. Anyone out there have some suggestion on getting a lower suction pressure without building a two stage system?