Intel Core i7-800 - Processor Specification for Operation Where Digital Thermal Sensor Exceeds TCONTROL; Processor Series

Thermal/Mechanical Specifications and Design Guidelines 39
Thermal Specifications
6.1.2 Processor Specification for Operation Where Digital
Thermal Sensor Exceeds T
CONTROL
When the DTS value is less than T
CONTROL
, the fan speed control algorithm can reduce
the speed of the thermal solution fan. This remains the same as with the previous
guidance for fan speed control.
During operation, when the DTS value is greater than T
CONTROL
, the fan speed control
algorithm must drive the fan speed to meet or exceed the target thermal solution
performance (Ψ
CA
) shown in Table 6-3 for the Intel Core™ i7-800 and i5-700 desktop
processor series (95 W). To get the full acoustic benefit of the DTS specification,
ambient temperature monitoring is necessary. See Chapter 7 for details on
characterizing the fan speed to Ψ
CA
and ambient temperature measurement.
Notes:
1. The ambient temperature is measured at the inlet to the processor thermal solution.
2. This column can be expressed as a function of T
AMBIENT
by the following equation:
Ψ
CA
= 0.29 + (45.1 - T
AMBIENT
) x 0.0181
3. This column can be expressed as a function of T
AMBIENT
by the following equation:
Ψ
CA
= 0.29 + (45.1 - T
AMBIENT
) x 0.0105
Table 6-3. Thermal Solution Performance above T
CONTROL
for the Intel
®
Core™ i7-800
and i5-700 Desktop Processor Series
T
AMBIENT
1
Ψ
CA
at
DTS = T
CONTROL
2
Ψ
CA
at
DTS = -1
3
45.1 0.290 0.290
44.0 0.310 0.301
43.0 0.328 0.312
42.0 0.346 0.322
41.0 0.364 0.333
40.0 0.383 0.343
39.0 0.401 0.354
38.0 0.419 0.364
37.0 0.437 0.375
36.0 0.455 0.385
35.0 0.473 0.396
34.0 0.491 0.406
33.0 0.510 0.417
32.0 0.528 0.427
31.0 0.546 0.438
30.0 0.564 0.448
29.0 0.582 0.459
28.0 0.600 0.469
27.0 0.618 0.480
26.0 0.637 0.491
25.0 0.655 0.501
24.0 0.673 0.512
23.0 0.691 0.522
22.0 0.709 0.533
21.0 0.727 0.543
20.0 0.746 0.554