The 1st one:
Capturing the heat:
The extreme performance APOGEE Universal water-block is responsible for absorbing the heat generated by today's hottest CPU's with incredible efficiency.
Moving the Heat around:
The Extreme performance MCP655™ 12 Volts DC industrial pump pushes the coolant throughout the circuit at high velocity.
Larger 7/16" ID (5/8" OD) tubing is used to maximize the coolant flow rate inside the system.
Dissipating the heat into the atmosphere:
The new MCR-220 copper and brass radiator doubles the surface area available for heat convection into the air compared to a single 120mm radiator, and uses two 72 CFM 120mm fans, at a reasonable* sound noise level of 37 dBA.
The MCB120 "Radbox" optimizes cooling by using fresh air from outside the computer, without adding any thermal load to other components.
The second one:
* APOGEE water-block: see complete specifications HERE
* MCR220 radiator see complete specifications HERE
* MCP655™ 12 Volts DC pump: see complete specifications HERE
* MCRES-Micro reservoir see complete specifications HERE
* MCB120 "Radbox" radiator mounting adapter specifications HERE