Zalman CNPS9900 MAX & CNPS5X CPU Coolers

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The most critical aspect of installation is that the heatsink be securely mounted. Tight mating results in good contact between the heatsink's base and the CPU heatspreader and more efficient heat conduction. Ideally, it should also be a simple procedure to minimize the potential of user error.

The mounting hardware is the same used in the CNPS10X Flex, except the Philips heads have been replaced with hexagonal screws. A long, thin hex screwdriver is included in the package. The only extra is a 4-pin PWM adapter with an inline resistor to decrease the fan's speed.

Nuts are inserted in the appropriate socket holes and black plastic braces are slid in to immobilize them. To keep the backplate in place during installation, a piece of double-sided tape is placed at the center.

The mounting plate is loosened slightly so that the mounting clips can be inserted under the base. The screws are then re-tightened.

The nuts on the backplate do not go all the way through the mounting holes and the clips are thin. After mounting, the clips flex downward. This makes the mating tighter at the corners, but our guess is the tension at the center is not great. Also, the hex screwdriver has to be used at angle on the thicker side of the heatsink.

Fully installed on our LGA1366 motherboard (we installed the heatsink improperly — the fan should blow in the opposite direction away from the memory slots). On AMD boards the cooler is oriented in the same East-West direction.

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