Pump and Expansion Tank
The pump and the expansion tank are one unit in the reviewed liquid cooling system:
Both devices reside next to each other on a plastic plate and are connected with a stiff pipe. The expansion tank has a volume of 300 cubic centimeters and is divided into two sections. The bottom section contains a chip that monitors the level of liquid in the tank using a special float. When the float is below an acceptable limit, the system emits an annoying sound and shuts the computer down (this is exactly what happened with me at the first launch of the system: the pump pumped out all the liquid out of the tank in a couple of seconds, the cooling system gave out its signal and turned off the computer). Besides that, the bottom section of the tank contains neon LEDs that highlight the coolant when the pump or the system at large is working.
At the top of the expansion tank there’s a threaded cap for adding the coolant to the system and an input fitting for the pipe from the water block:
The pump in its turn has an output fitting:
The DP-600 pump is manufactured by Gigabyte on Taiwan. It works on 12V and consumes about 6W. The dimensions of the device are 61x50x46mm; its capacity is 400 liters per hour; and its noise is no more than 20dBA. The manufacturer claims that using ceramic bearings this pump can work over 70,000 hours without a failure. This is more than 8 years of incessant operation.
The pump and expansion tank receive their power through a typical Molex connector and a Power SW connector which probably should be attached in-line to the appropriate connector on the mainboard. But the system didn’t start up on such a connection and I made the system work by connecting it only though the Molex connector (we got no guides with the system as it came to our labs, so some installation-related problems were unavoidable).