Intel E6420 Design Guidelines - Page 43

Table 5-2. Acoustic Targets - power supply

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Balanced Technology Extended (BTX) Thermal/Mechanical Design Information Table 5-2. Acoustic Targets Fan Speed RPM Thermistor Set Point Acoustic Thermal Requirements, ca Notes ~ 5300 High TA 35 °C 6.4 BA ~ 2500 Low TA = 23 °C No Target Defined 0.38 C/W 0.56 C/W ~ 1400 Low TA = 23 °C ~ 1400 Low TA = 23 °C 3.4 BA 4.0 BA ~0.87 C/W ~0.87 C/W Case 1: Thermal Design Power Maximum fan speed 100% PWM duty cycle Case 2 Thermal Design Power System (PSU, HDD, TMA) Fan speed limited by the fan hub thermistor Case 3 50% Thermal Design Power TMA Only 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 5.1.3 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 TCONTROL 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 7 for further details. Note: Appendix G gives detailed fan performance for the Intel reference thermal solutions with 4 Wire PWM Controlled fan. Thermal and Mechanical Design Guidelines 43

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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,
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 5.1.3
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 7 for further details.
Note:
Appendix G gives detailed fan performance for the Intel reference thermal solutions
with 4 Wire PWM Controlled fan.