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Specification Sheet

ManualsBrandsINTEL ManualsPC ComponentsWOF processor Core i7 i7-8700K 6 x 3.7 GHz H
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Datasheet, Volume 1 of 2 109
Thermal Management
5.4.6 Fan Speed Control Scheme with Digital Thermal Sensor
(DTS) 2.0
To simplify processor thermal specification compliance, the processor calculates the
DTS Thermal Profile from T
CONTROL
Offset, TCC Activation Temperature, TDP, and the
Thermal Margin Slope provided in the following table.
Note: TCC Activation Offset is 0 for the processors.
Using the DTS Thermal Profile, the processor can calculate and report the Thermal
Margin, where a value less than 0 indicates that the processor needs additional cooling,
and a value greater than 0 indicates that the processor is sufficiently cooled.
6-Core GT2 95W 0.44 0.263 0.211 0.158
6-Core GT2 65W 0.763 0.477 0.4 0.323
6-Core GT2 35W 1.156 0.743 0.6 0.457
4-Core GT2 91W 0.44 0.275 0.220 0.165
4-Core GT2 65W 0.753 0.477 0.40 0.323
4-Core GT2 62W 0.775 0.484 0.403 0.323
4-Core GT2 35W 1.194 0.743 0.6 0.457
2-Core GT2/GT1 58W 0.796 0.483 0.379 0.310
2-Core GT2/GT1 54W 0.809 0.481 0.389 0.296
2-Core GT2/GT1 35W 1.377 0.743 0.6 0.457
Notes:
1. Ψ
CA
at "DTS = T
CONTROL
" is applicable to systems that have an internal T
RISE
(T
ROOM
temperature to
Processor cooling fan inlet) of less than 10 °C. In case the expected T
RISE
is greater than 10 °C, a
correction factor should be used as explained below. For each 1 °C T
RISE
above 10 °C, the correction
factor (CF) is defined as CF = 1.7 / (processor TDP)
2. Example: A chassis T
RISE
assumption is 12 °C for a 91 W TDP processor: CF = 1.7 / 91 W = 0.019 /W For
T
RISE
> 10 °C Ψ
CA
at T
CONTROL
= (Value provide in Column 2) – (T
RISE
– 10) * CF Ψ
CA
= 0.45 – (12 – 10)
0.019 = 0.41 °C/W In this case, the fan speed should be set slightly higher, equivalent to
Ψ
CA
= 0.41 °C/W
Table 5-12. Digital Thermal Sensor (DTS) 1.1 Thermal Solution Performance Above
T
CONTROL
(Sheet 2 of 2)
Processor
Ψ
CA
at DTS =
T
CONTROL
1, 2
At System
T
AMBIENT_MAX
= 30 °C
Ψ
CA
at DTS = -1
At System
T
AMBIENT_MAX
= 40 °C
Ψ
CA
at DTS = -1
At System
T
AMBIENT_MAX
= 45 °C
Ψ
CA
at DTS = -1
At System
T
AMBIENT_MAX
= 50 °C