Why not just have one stage cool both condensors such as a chiller so you would have chilled water condensors. From there have one unit with dual heads for the vid card with one head shutoff and turn it on in the future for SLI or other. Then have the other compressor for the CPU...that is what i am plaining on doing will be much eaiser then a "normal" cascade but it think that you should be getting some temps around -50 maybe colder depending on the gas...R404a would work well in the chiller then maybe R507...in the others...
that is my .02 C
Duke
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