Intel 5100 manual 105

Intel® 5100 MCH Chipset

2.Define a target local ambient temperature, TLA.

3.Use Equation 1 and Equation 2 to determine the required thermal performance needed to cool the device.

The following provides an example of how you might determine the appropriate performance targets.

Assume:

•TDP = 25.0 W and TCASE = 105 °C

•Local processor ambient temperature, TLA, = 60 °C

Then the following could be calculated using Equation 1 for the given chipset configuration.

ΨCA =	TCASE – TLA	=	105 –	60	= 1.8	°C ⁄ W
	---------TDP----------------		-------25-------

To determine the required heatsink performance, a heatsink solution provider would need to determine ΨCS performance for the selected TIM and mechanical load configuration. If the heatsink solution were designed to work with a TIM material performing at ΨCS ≤ 0.20 °C/W, solving from Equation 2, the performance needed from the heatsink is as follows.

ΨSA = ΨCA – ΨCS = 1.8 – 0.20 = 1.6°C ⁄ W

If the local ambient temperature is relaxed to 45 °C, the same calculation can be carried out to determine the new case-to-ambient thermal resistance.

ΨCA =	TCASE – TLA		105 –	45	C
	---------TDP----------------	=	------25--------		= 2.4°W---

It is evident from the above calculations that a reduction in the local ambient temperature has a significant effect on the case-to-ambient thermal resistance requirement. This effect can contribute to a more reasonable thermal solution including reduced cost, heatsink size, heatsink weight, and a lower system airflow rate.

Intel® 5100 Memory Controller Hub Chipset for Communications, Embedded, and Storage Applications

TDG	July 2008
14	Order Number: 318676-003US