Koolance provides a detailed, nicely illustrated, 23-page PC4-1000 Series User’s Manual with the system, which I found to be clearly written and easy to follow.  As mentioned earlier, you may want to remove the radiator/fan assembly from the top of the case while you install the motherboard and get everything wired up and the tubing routed — it’s a lot easier!


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The test rig that I’m using for this review is based on an Asus P5N32-SLI Deluxe motherboard, which has two heat pipes to cool the Northbridge, Southbridge and voltage regulator chips.  Mounting this particular board in the PC-V1000 chassis places the heat pipes in and upside-down position.  While the P5N32-SLI is an excellent board, I would not recommend using it long term in a PC-V1000 chassis.


Initially I planned to use a 750W power supply but quickly remembered the PC-V1000 chassis doesn’t accommodate the larger (longer) power supplies (without modification) so I went with a high-quality 500W model that fits just fine.  Alternately, if you really want/need to use one of the longer power supplies, Koolance offers the same PC4 liquid cooling system in two larger case styles: the PC4-1026 (PC-V1200 chassis) or the PC4-1036 (PC-V2000 chassis).  And for those who might be curious, the maximum measured AC power draw was just over 400 watts with the CPU and both video cards loaded.  This is a high-efficiency PSU (~82%), which means the actual power draw on the DC side was only about 330 watts; well within the units 500 watt rated capacity.


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The reservoir/pump unit comes preinstalled in the upper 5.25′ drive bay but can be moved to a lower bay if you prefer.  I chose to leave it were it is as having the tubing up high worked out well for my installation.  A spare 4-pin Molex drive connector must be plugged into the rear of the unit for power.  The radiator fan wire plugs into one of the fan connectors and the rear case fan can be connected to the second to enable automatic speed control if desired.  Using the three temperature probes and ATX pass-thru lead for automatic fan speed control and computer shutdown is optional but highly recommended.


Overall, the installation was straightforward and relatively easy.  Using multiple waterblocks adds a little complexity and the chassis fills up quickly with components and tubing.  This can make working inside the case difficult and requires patience.  The manual provides good advice about how to connect the waterblocks and in what order.  For this review I will be using a Pentium 4 Extreme Edition 955 processor and two nVIDIA 7800GTX video cards in SLI to fully test the PC4-1025’s capabilities.


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(Source: PC4-1000 Manual, modified)


Notice that the two video card coolers are connected in parallel with each other and in series with the CPU waterblock. This helps maximize the overall system water flow and insures the CPU waterblock has optimum flow.  I used the included Koolance flow splitters to make the transition from 3/8′ ID to 1/4″ ID tubing and back again.


Prior to installing the CPU waterblock, one of the three Koolance temperature sensors was applied to the base of the CPU-305-V10 cooler with the included copper foil tape.


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I used the CPU-305’s LGA775 mounting hardware to attach the CPU cooling block to the 955 dual core CPU.  The motherboard must be removed to install the two mounting brackets.  Note the LGA775 brackets use the lower set of holes for mounting the cross piece and not the upper holes.  The CPU-305 Installation Guide v1.00 that came with the cooler says to use the upper holes, which is wrong (and will result in a dangerously loose fit), but a more recent version v1.02 (available on the Koolance website) correctly says to use the lower set of holes when mounting the CPU-305 waterblock.


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After the CPU IHS and waterblock base are cleaned with isopropyl alcohol, apply a little thermal compound and position the waterblock and mounting bracket on top of the CPU.  Carefully tighten the knob to securely clamp the CPU-305-V10 cooler in place.  The LGA775 mount uses the black knob.


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