MC462 INSTALLATION GUIDE   I. Preparing the motherboard Install the four standoff spacers to the motherboard as follows:       How to recognize whether you need to use the shoulder washer or not:  if the shoulder portion of the washer fits inside the motherboard hole, it is needed.  If it doesn't then you must not use the shoulder washer. (see ALSO Frequently Asked Question below)   FREQUENTLY ASKED QUESTION: My motherboard has the small holes (.150") for mounting the MC462 heat sink, but they are not grounded. Can I install the standoffs on the bare motherboard?" No. This could damage your motherboard.  MC462's shipped prior to July 1st, only include nylon shoulder washers meant for .230" holes (see installation guide).  If the holes in your motherboard are grounded (you can recognize this by the silver ring around the hole), the standoffs could be safely installed.  But if the holes are not grounded, you should use fiber washers. Washers dimensions are:  .250" OD x .140" ID x .018 up to.033" thickness max.  Effective July 1st, all shipments of MC462's include a set of 4 fiber washers for this purpose alone.   II. Installation   AMD CPU’s Insert your CPU into the socket and lightly coat the core with the provided high quality thermal compound. Alternatively, we recommend Arctic Silver compound for superior thermal conductivity. Place the bare MC462 heat sink on the CPU, aligning the mounting screws with the standoffs. Gradually tighten the screws in a cross pattern, until you feel that they have bottomed.   There is no need to over-tighten. A “finger-tight” lock is sufficient. Adjustments are neither required nor recommended, because the compression rate of the springs has been precisely calculated to comply with AMD mechanical specifications. Install the fan onto the heat sink with the provided screws. AMD ASSEMBLY   Pentium® 4 CPU’s Bolt the provided brackets onto your heat sink using 4 socket screws, as shown in the schematics and picture below. Remove the stock black plastic mounting brackets from your motherboard, since you will be using our own standoffs. At your discretion, you can use the existing nuts from the motherboard back plate to screw-in our standoffs, instead of the nylon nuts that came with your MC462. Insert your CPU into the socket and lightly coat the core with the provided high quality thermal compound. Alternatively, we recommend Arctic Silver compound for superior thermal conductivity. Place the bare MC462 heat sink on the CPU, aligning the mounting screws with the standoffs. Gradually tighten the screws in a cross pattern, until you feel that they have bottomed.   There is no need to over-tighten. A “finger-tight” lock is sufficient. Adjustments are neither required nor recommended, because the compression rate of the springs has been precisely calculated to comply with Intel® mechanical specifications. Install the fan onto the heat sink with the provided screws. Intel® Pentium® 4 ASSEMBLY   The MC462-Pentium® 4 installed on Intel® reference board   FAN INSTALLATION NOTES: This heat sink is designed to operate in “impingement”. In other words, the fan flow should be directed towards the base of the heat sink. Reversing the flow will cause significant drop in performance. The Sanyo Denki fan provided with your heat sink has two connectors.   The four pin connector should be connected to the power supply, and the three pin connector should be connected to your motherboard CPU fan monitoring header.   Uninstall note : CPU removal from the socket Once in place, the standoffs may slightly interfere with CPU removal in some motherboards:   Depending on the manufacturers, sockets use either a plastic locking arm, or a metal locking arm. Sockets using a plastic locking arm require that the arm be slightly pried open at the center in order to release it from its retaining tab. This can easily be done by inserting a thin screwdriver in between the socket body and the arm’s mid-section, and by slightly twisting the screwdriver in either direction, while pulling on the arm. This will slightly arch the mid-section of the arm, and release it from its locking tab.   Here is a picture showing precisely how to do it: For customer support: call 818-901-9568   DISCLAIMER: Swiftech assumes no liability whatsoever, expressed or implied, for the use of these products.