Intel D945PSN D945PSN Desktop Board Specification Update - Page 12

Intel® Desktop Board D945PSN Specification Update ERRATA 1. Hardware Monitoring and Fan Control Could Fail and Only Run at a Maximum or Minimum PWM for CPU Fan PROBLEM: The Hardware Monitoring and Fan Control may only support up to 3.6V on its Pulse Width Modulation (PWM) outputs. The 4-pin fans used with the Intel Desktop board could have a pull up voltage as high as 5.25V, potentially causing failures in the circuit used for fan control on this Intel Desktop Board. IMPLICATION: If Hardware Monitoring and Fan Control fails due to this erratum, the CPU fan could run at either 100% PWM, or at a minimum PWM (normally set to 30% PWM for four-pin CPU fans). A failure at 100% PWM could result in louder system acoustics. A failure at minimum PWM may result in the reduced heat sink efficiency being insufficient to fully support the processor thermal requirements at some higher work loads. A variety of conditions such as room temperature, heat sink characteristics, application, workload and chassis design will affect the impact of the PWM failure. If the thermal requirements of the processor are not met, the processor will attempt to reduce its own temperature. Depending on the severity of the ASIC failure, this may result in a noticeable performance reduction. WORKAROUND: None STATUS: This erratum has been fixed. Refer to the Product Change Notification 105496-02 available at http://developer.intel.com/design/pcn/MTHRBRD/index.htm. 2. Digital Noise May Affect Audio Quality When Using the Rear MIC Input on boards with a 6-Channel (5.1) Audio Subsystem PROBLEM: Digital noise may affect audio quality when using the rear MIC input on boards with a 6-Channel (5.1) Audio Subsystem. The digital noise can affect the MIC signal via the Codec's MIC bias voltage. IMPLICATION: Digital noise may be heard on the rear MIC input when systems are used in the following configuration: input monitor enabled in drivers, MIC boost set to 20dB gain, and MIC volume set to maximum. The digital noise may be heard when recording voice, during voice chat, when dragging window around the screen, or when opening and closing windows. No noise issues have been associated with the front panel MIC input. WORKAROUND: None STATUS: This erratum may be fixed in a future board revision. 3. The placement of capacitors behind PCI Express* x1 connector slot 1 may prohibit some PCI Express x1 addin cards from properly connecting to the motherboard PROBLEM: Due to the design and placement of the audio circuitry on this motherboard, it was necessary to position capacitors in the keep-out zone behind PCI Express* x1 connector slot 1. 6