651 datasheet(102/106 Pages) INTEL

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Balanced Technology Extended (BTX) Boxed Processor Specifications

102

Datasheet

In addition, Type I TMA must be used with Type I chassis only and Type II TMA with

Type II chassis only. Type I TMA will not fit in a Type II chassis due to the height

difference. In the event a Type II TMA is installed in a Type I chassis, the gasket on the

chassis will not seal against the Type II TMA and poor acoustic performance will occur

as a result.

8.3.2

Variable Speed Fan

The boxed processor fan will operate at different speeds over a short range of

temperatures based on a thermistor located in the fan hub area. This allows the boxed

processor fan to operate at a lower speed and noise level while thermistor

temperatures are low. If the thermistor senses a temperatures increase beyond a lower

set point, the fan speed will rise linearly with the temperature until the higher set point

is reached. At that point, the fan speed is at its maximum. As fan speed increases, so

do fan noise levels. These set points are represented in Figure 32 and Table 37. The

internal chassis temperature should be kept below 35.5ºC. Meeting the processor’s

temperature specification (see Chapter 5) is the responsibility of the system integrator.

Note:

The motherboard must supply a constant +12 V to the processor’s power header to

ensure proper operation of the variable speed fan for the boxed processor (refer to

Table 37) for the specific requirements).

Figure 32.

Boxed Processor TMA Set Points

Lower Set Point

Lowest Noise Level

Internal Chassis Temperature (Degrees C)

Increasing Fan

Speed & Noise

Higher Set Point

Highest Noise Level

651 Datasheet(PDF) 102 Page - Intel Corporation