What you are asking to do is in the commercial league. I work in a lab. We have looked at LN2 gas generators and LN2 liquid units. They are expensive but exist all the same.

I can only infer from the application you desire that:

- Since you are using 8 CPUS that your budget is large. Cooling anything 24/7 means you run a large risk of condensation (creeping beyond the CPU zone).
- You can afford to break expensive hardware


Cascade systems handling hundreds or watts are more power hungry and hence more expensive to run 24/7 than a LN2 unit.

You must weigh up the capital expense vs ongoing costs.
Unrockstars rig is a money sink and has only one head.



So give us something more to work with here. What is the application? Is it commercial or simply for 'bling' factor?