Intel E5310 - Xeon 1.6 GHz 8M L2 Cache 1066MHz FSB LGA771 Active Quad-Core Processor Datasheet page 110

The other items listed in
shipped with either the chassis or boards. They are as follows:
• CEK Spring (supplied by baseboard vendors)
• Heat sink standoffs (supplied by chassis vendors)
110
Figure 8-3 that are required to compete this solution will be
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Quad-Core Intel® Xeon® Processor 5300 Series Datasheet
Boxed Processor Specifications