Balanced Technology Extended (BTX) Thermal/Mechanical Design Information
Thermal and Mechanical Design Guidelines
43
Table
5-2. Acoustic Targets
Fan
Speed
RPM
Thermistor
Set Point
Acoustic Thermal
Requirements,
Ψ
ca
Notes
~ 5300
High
T
A
≥
35 °C
≤
6.4 BA
0.38
°
C/W
Case 1:
Thermal Design Power
Maximum fan speed
100% PWM duty cycle
~ 2500
Low
T
A
= 23 °C
No Target
Defined
0.56
°
C/W
Case 2
Thermal Design Power
System (PSU, HDD, TMA)
Fan speed limited by the
fan hub thermistor
~ 1400
Low
T
A
= 23 °C
≤
3.4 BA
~0.87
°
C/W Case
3
50% Thermal Design
Power
TMA Only
~ 1400
Low
T
A
= 23 °C
≤
4.0 BA
~0.87
°
C/W
Case 3
50% Thermal Design
Power
System (PSU, HDD, TMA)
NOTES:
1.
Acoustic performance is defined in terms of measured sound power (LwA) as defined in
ISO 9296 standard, and measured according to ISO 7779.
2.
Acoustic testing will be for the TMA only when installed in a BTX S2 chassis for Case 1
and 3
3.
Acoustics testing for Case 2 will be system level in the same a BTX S2 reference chassis
and commercially available power supply. Acoustic data for Case 2 will be provided in
the validation report but this condition is not a target for the design. The acoustic model
is predicting that the power supply fan will be the acoustic limiter.
4.
The fan speeds (RPM) are estimates for one of the two reference fans and will be
adjusted to meet thermal performance targets then acoustic target during validation.
The designer should identify the fan speed required to meet the effective fan curve
shown in Section
While the fan hub thermistor helps optimize acoustics at high processor workloads by
adapting the maximum fan speed to support the processor thermal profile, additional
acoustic improvements can be achieved at lower processor workload by using the
T
CONTROL
specifications described in Section
2.2.3. Intel’s recommendation is to use the
fan with 4 Wire PWM Controlled to implement fan speed control capability based the
digital thermal sensor. Refer to Chapter
Note:
Appendix G gives detailed fan performance for the Intel reference thermal solutions
with 4 Wire PWM Controlled fan.
Summary of Contents for Celeron Dual-Core E1000 Series
Page 10: ...10 Thermal and Mechanical Design Guidelines...
Page 26: ...Processor Thermal Mechanical Information 26 Thermal and Mechanical Design Guidelines...
Page 68: ...ATX Thermal Mechanical Design Information 68 Thermal and Mechanical Design Guidelines...
Page 86: ...Heatsink Clip Load Metrology 86 Thermal and Mechanical Design Guidelines...
Page 88: ...Thermal Interface Management 88 Thermal and Mechanical Design Guidelines...
Page 120: ...Legacy Fan Speed Control 120 Thermal and Mechanical Design Guidelines...
Page 126: ...Fan Performance for Reference Design 126 Thermal and Mechanical Design Guidelines...
Page 127: ...Fan Performance for Reference Design Thermal and Mechanical Design Guidelines 127...
