Next, the stock air coolers were removed from the 7800GTX video cards and the VID-200-L06 coolers were installed. The GPUs and waterblock bases were cleaned with isopropyl alcohol and a little thermal compound was applied to the GPU and each of the eight thermal pads covering the video RAM chips.
The mounting hardware configuration is excellent and the installation procedure is very straight forward. I did notice that the aluminum memory cooler didn’t totally cover all the chips. A couple of the chips had a small corner or edge sticking out from under the memory cooler but the thermal pads should compensate.
Once all the waterblocks are in place, the tubing pieces can be cut and installed to complete the installation. It’s a good idea to take your time and carefully plan how best to route the tubing. Make sure all the wires and tubes are neatly routed and don’t interfere with other components inside the PC.
Note: Use a cup of hot water to dip the ends of tubes into to soften them before installing the tubes onto the barb fittings. This makes installation much easier!
Koolance supplies a 700ml bottle of pre-mixed coolant with the PC4-1025 for filling the system. I added the coolant into the reservoir fill port and found my particular setup used about 450 ml to fill the system. Once the reservoir is filled, power can be applied to the 5.25′ bay unit, which will start the pump and induce water flow. You will need to stop the pump and top off the reservoir as the system fills and all the air is removed from the lines. Initially, the pump was a little noisy but quickly quieted down to a low hum after the first hour of operation and all the small air bubbles worked themselves out of the system. Slowing the pump down with the manual speed control made it virtually silent.
CAUTION: Do not run the pump dry. Fill the reservoir before applying power to the pump.
As with any PC water-cooling system, we highly recommend leak testing the assembled system before powering up the computer. Koolance includes a jumper wire (with instructions on how to use it) to jumper the PC’s power supply ATX connector (Pwr-On to Gnd) for testing. I personally use an old power supply hooked up externally to complete the filling and testing phase instead of jumping the PC’s main PSU.