Edward, my system pass PCT in EFI boot, and the SEL log:

Version IPMI v2.0

Number of Entries 28

Last Add Time 07/22/2012-09:36:26

Last Erase Time 07/22/2012-07:42:32

Free Space Remaining in Bytes 64998

Num  Time Stamp  Sensor Type, Name & Number  Event Description  Generator ID

1  07/22/2012-07:42:32  Event Log Cleared /System Event Log (#0x07)  Informational event: System Event Log reports the log area has been cleared.  BMC - LUN #0 (Channel #00h)

2  07/22/2012-07:43:18  Power Unit /Pwr Unit Status (#0x01)  Informational event: Pwr Unit Status reports the power unit is powered off or being powered down.  BMC - LUN #0 (Channel #00h)

3  07/22/2012-07:43:18  Power Unit /Pwr Unit Status (#0x01)  CRITICAL event: Pwr Unit Status reports the power unit has suffered a failure.  BMC - LUN #0 (Channel #00h)

4  07/22/2012-07:43:22  Power Unit /Pwr Unit Status (#0x01)  Informational event: Pwr Unit Status reports the power unit is powered off or being powered down.  BMC - LUN #0 (Channel #00h)

5  07/22/2012-07:43:23  Power Unit /Pwr Unit Status (#0x01)  Informational event: Pwr Unit Status reports the power unit has suffered a failure.  BMC - LUN #0 (Channel #00h)

6  07/22/2012-07:43:33  Fan /Processor 2 Fan (#0x30)  Warning event: Processor 2 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

7  07/22/2012-07:43:33  Fan /Processor 1 Fan (#0x31)  Warning event: Processor 1 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

8  07/22/2012-07:43:34  Fan /Processor 2 Fan (#0x30)  Informational event: Processor 2 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: Unspecified.  Threshold value: Unspecified.  BMC - LUN #0 (Channel #00h)

9  07/22/2012-07:43:34  Fan /Processor 1 Fan (#0x31)  Informational event: Processor 1 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: Unspecified.  Threshold value: Unspecified.  BMC - LUN #0 (Channel #00h)

10  07/22/2012-07:43:35  Fan /Processor 2 Fan (#0x30)  Warning event: Processor 2 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

11  07/22/2012-07:43:35  Fan /Processor 1 Fan (#0x31)  Warning event: Processor 1 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

12  07/22/2012-07:43:41  Fan /Processor 2 Fan (#0x30)  Informational event: Processor 2 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: 899 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

13  07/22/2012-07:43:42  Button /Button (#0x09)  Informational event: Button reports the power button has been pressed.  BMC - LUN #0 (Channel #00h)

14  07/22/2012-07:43:43  Fan /Processor 1 Fan (#0x31)  Informational event: Processor 1 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: 899 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

15  07/22/2012-07:43:45  Power Unit /Pwr Unit Status (#0x01)  Informational event: Pwr Unit Status reports the power unit is powered off or being powered down.  BMC - LUN #0 (Channel #00h)

16  07/22/2012-09:35:07  Power Unit /Pwr Unit Status (#0x01)  Informational event: Pwr Unit Status reports the power unit is powered off or being powered down.  BMC - LUN #0 (Channel #00h)

17  07/22/2012-09:35:07  Button /Button (#0x09)  Informational event: Button reports the power button has been pressed.  BMC - LUN #0 (Channel #00h)

18  07/22/2012-09:35:18  Fan /Processor 2 Fan (#0x30)  Warning event: Processor 2 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 775 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

19  07/22/2012-09:35:18  Fan /Processor 1 Fan (#0x31)  Warning event: Processor 1 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

20  07/22/2012-09:35:18  Fan /Processor 2 Fan (#0x30)  Informational event: Processor 2 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: Unspecified.  Threshold value: Unspecified.  BMC - LUN #0 (Channel #00h)

21  07/22/2012-09:35:18  Fan /Processor 1 Fan (#0x31)  Informational event: Processor 1 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: Unspecified.  Threshold value: Unspecified.  BMC - LUN #0 (Channel #00h)

22  07/22/2012-09:35:19  Fan /Processor 2 Fan (#0x30)  Warning event: Processor 2 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 775 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

23  07/22/2012-09:35:19  Fan /Processor 1 Fan (#0x31)  Warning event: Processor 1 Fan reports the sensor is in a low, but non-critical, and going lower state.  Sensor reading: 744 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

24  07/22/2012-09:35:26  Fan /Processor 2 Fan (#0x30)  Informational event: Processor 2 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: 930 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

25  07/22/2012-09:35:26  Fan /Processor 1 Fan (#0x31)  Informational event: Processor 1 Fan reports the sensor is no longer in a low non-critical state.  Sensor reading: 868 RPM.  Threshold value: 775 RPM.  BMC - LUN #0 (Channel #00h)

26  07/22/2012-09:35:31  System Event /BIOS Evt Sensor (#0x83)  Informational event: BIOS Evt Sensor reports Timestamp Clock Sync. Event is first of two expected events from BIOS on every power on.  BIOS (Channel #00h)

27  07/22/2012-09:35:32  System Event /BIOS Evt Sensor (#0x83)  Informational event: BIOS Evt Sensor reports Timestamp Clock Sync. Event is second of two expected events from BIOS on every power on.  BIOS (Channel #00h)

28  07/22/2012-09:36:26  System Event /BIOS Evt Sensor (#0x83)  Informational event: BIOS Evt Sensor reports a system boot event has occurred.  BIOS (Channel #00h)

I think it's not the PSU problem, I had tried to replace 2 PSU, but nothing changed. Finally I set the bios option " hyper threading" to Disable, and then the system is OK now!

If who had the same issue?