Intel CORE2DUO/T7300 Mechanical Design Guidelines - Page 40
Acoustics - core 2 duo max temperature
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Balanced Technology Extended (BTX) Thermal/Mechanical Design Information 5.1.2 Acoustics To optimize acoustic emission by the fan heatsink assembly, the Type II reference design implements a variable speed fan. A variable speed fan allows higher thermal performance at higher fan inlet temperatures (TA) and the appropriate thermal performance with improved acoustics at lower fan inlet temperatures. Using the example in Table 5-2 for the Intel Core™2 Duo processor with 4 MB cache at TC-MAX of 60.1 °C the required fan speed necessary to meet thermal specifications can be controlled by the fan inlet temperature and should comply with requirements in Table 5-2. Table 5-2. Acoustic Targets Fan Speed RPM Thermistor Set Point Acoustic Thermal Requirements, Ψca Notes ~ 5300 High TA ≥ 35 °C ≤ 6.4 BA ~ 2500 ~ 1400 ~ 1400 Low TA = 23 °C No Target Defined Low TA = 23 °C Low TA = 23 °C ≤ 3.4 BA ≤ 4.0 BA 0.38° C/W 0.56° C/W ~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 2.2.4. 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 F gives detailed fan performance for the Intel reference thermal solutions with 4 Wire PWM Controlled fan. 40 Thermal and Mechanical Design Guidelines