Cascade systems use phase change systems to cool phase change systems which in turn cool the CPU.
Single stage (ie Vapochill etc) can only cool down to about -60C. To get below that you need to use a different refrigerant but these won't work if you use room temperature air to cool them. Hence you get another phase change system to cool the first at what ever temperature it operates at. Then that one is cooled by normal air.
You generally get either 2 or 3 stage cascades.
Jokester
Single stage (ie Vapochill etc) can only cool down to about -60C. To get below that you need to use a different refrigerant but these won't work if you use room temperature air to cool them. Hence you get another phase change system to cool the first at what ever temperature it operates at. Then that one is cooled by normal air.
You generally get either 2 or 3 stage cascades.
Jokester