Intel DX79SI Product Guide for Intel Desktop Board DX79SI - Page 41
Installing a Processor Fan Heat Sink, - lga2011
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Installing and Replacing Desktop Board Components Installing a Processor Fan Heat Sink The LGA2011 processor socket has four threaded holes for mounting a processor fan heat sink. Figure 16 shows installation of a typical processor fan heat sink; yours may differ. For detailed instructions on attaching a processor fan heat sink to the Desktop Board, refer to the Intel boxed processor manual, Intel boxed thermal solution manual, or instructions third-party thermal solution providers. Connect the processor fan heat sink cable to the 4-pin processor fan header (see Figure 16). A fan with a 4-pin connector as shown in Figure 16 is recommended; however, fans with a 3-pin connectors can be used. However, since a 3-wire fan cannot use the onboard fan control, the fan will always operate at full speed. Figure 16. Installing a Fan Heat Sink and Connecting the Cable to the Processor Fan Header 41