Intel 945GZ ユーザーズマニュアル

Thermal and Mechanical Design Guidelines   

 21 

Top View

Balanced Technology

Extended (BTX)  Thermal

Module Assembly Over

Processor

(G)MCH

Airflow Direction

Proc_HS_Orient

 

The motherboard component keep-out restrictions for the (G)MCH on an ATX platform 
are included in 

Appendix B, Figure 10. The motherboard component keep-out 

restrictions for the (G)MCH on a BTX platform are included in Figure 11. 

System integrators should ensure no board or chassis components would intrude into 

the volume occupied by the (G)MCH thermal solution. 

The reference thermal solution for the (G)MCH for an ATX platform is shown in  
Figure 7 and 

Appendix B and is an aluminum extruded heatsink that uses two ramp 

retainers, a wire preload clip, and four custom motherboard anchors. The heatsink is 

attached to the motherboard by assembling the anchors into the board, placing the 

heatsink over the (G)MCH and anchors at each of the corners, and securing the plastic 

ramp retainers through the anchor loops before snapping each retainer into the fin 

gap. The assembly is then sent through the wave process. Post wave, the wire preload 

clip is assembled using the hooks on each of the ramp retainers. The clip provides the 

mechanical preload to the package. A thermal interface material (Chomerics* T710) is 

pre-applied to the heatsink bottom over an area that contacts the package die. 

The reference thermal solution for the (G)MCH for a BTX platform is shown in  

Figure 8. The heatsink is aluminum extruded and uses a Z-clip for attach. The clip is 

secured to the system motherboard via two solder-down anchors around the (G)MCH. 

The clip helps to provide a mechanical preload to the package via the heatsink. A 

thermal interface material (Chomerics* T710) is pre-applied to the heatsink bottom 

over an area in contact with the package die. 

The ATX reference thermal solution differs from the BTX reference solution because a 

BTX platform requires a Support and Retention Mechanism (SRM) that helps to meet 

the mechanical requirements listed in Table 4.