Specifications

ATX Reference Thermal Solution
44 Thermal/Mechanical Design Guide
6.4.3 Core
The core is the same forged design used in RCFH4. This allows the reuse of the fan
attach and if desired the same extrusion as used in RCFH4. The machined flange height
has been reduced from the RCFH4 design to match the IHS height for the Intel®
Xeon® Processor 3500 Series when installed in the LGA1366 socket. The final height of
the flange will be an output of the design validation and could be varied to adjust the
preload. See Section 6.5 for additional information on the critical to function interfaces
between the core and clip.
6.5 Mechanical Interface to the Reference Attach
Mechanism
The attach mechanism component from the Intel RCBF5 Reference Design can be used
by other 3rd party cooling solutions. The attach mechanism consists of:
• A metal attach clip that interfaces with the heatsink core, see Figure B-11 and
Figure B-12 for the clip drawings.
• Four plastic fasteners, see Figure B-7, Figure B-8, Figure B-9, and Figure B-10 for
the component drawings.
Figure 6-6 shows the reference attach mechanism (clip, core and extrusion) portion of
the Intel RCBF5 Reference Design. The clip is assembled to the heatsink during copper
core insertion, and is meant to be trapped between the core shoulder and the extrusion
as shown in Figure 6-7.
The critical to function mechanical interface dimensions are shown in Figure 6-7 and
Figure 6-8. Complying with the mechanical interface parameters is critical to
generating a heatsink preload compliant with the minimum preload requirement for the
selected TIM and to not exceed the socket design limits.
Figure 6-5. Core