Acer E3-1220 v3 KC.12201.3E3 User Manual

The Ψ

CA

 point at DTS = -1 defines the minimum Ψ

CA

 required at TDP considering the

worst case system design T

AMBIENT

 design point:

Ψ

CA

 = (T

CASE-MAX

 – T

AMBIENT-TARGET

) / TDP

For example, for a 95 W TDP part, the T

case

 maximum is 72.6 °C and at a worst case

design point of 40 °C local ambient this will result in:

Ψ

CA

 = (72.6 – 40) / 95 = 0.34 °C/W

Similarly for a system with a design target of 45 °C ambient, the Ψ

CA

 at DTS = -1

needed will be 0.29 °C/W.

The second point defines the thermal solution performance (Ψ

CA

) at T

CONTROL

. The

following table lists the required Ψ

CA

 for the various TDP processors.

These two points define the operational limits for the processor for DTS 1.1

implementation. At T

CONTROL

 the fan speed must be programmed such that the

resulting Ψ

CA

 is better than or equivalent to the required Ψ

CA

 listed in the following

table. Similarly, the fan speed should be set at DTS = -1 such that the thermal

solution performance is better than or equivalent to the Ψ

CA

 requirements at T

AMBIENT-

MAX

. The fan speed controller must linearly ramp the fan speed from processor DTS =

T

CONTROL

 to processor DTS = -1.

Intel

®

 Xeon

®

 Processor E3-1200 v3 Product Family

June 2013

Datasheet – Volume 1 of 2

Order No.: 328907-001

65