13 June 2009

Phenom II X4 940 BE Temperature Analysis

Little Overclocking and you'll hit the Max Temperature allowed for Phenom II X4 940 BE which is 62°C. I hit that temperature when I overclocked to 3.6 GHz with 1.4 V. Cool'n'Quiet helps in decreasing the CPU temperature by 5-6°C. My current idle temperature is 39°C-45°C with Cool'n'Quiet enabled and full load temperature goes upto 55°C (with playing FarCry2). Here is the analysis (using Biostar TA790GX 128MB):

Figure 1 (Y-axis: Temperature in °C, X-axis: Time in Mins)

Figure 1 shows the temperature for 3 different cases:
  • No Overclocking + Cool'N'Quiet enabled (Blue Line)
  • OCed to 3.4GHz + Cool'N'Quiet disabled + stock voltage (Red Line)
  • No Overclocking + Cool'N'Quiet disabled (Green Line)
Ran the test for one hour for each setting. The maximum temperature I hit was 55°C under full load and the lowest temperature was 39°C. My room temperature stays between 25-35°C so idle CPU temperature is not bad but its not good either. With stock CPU cooler I'll suggest to enable the cool n quiet feature. And if you want to overclock, don't exceed more than 3.4GHz, because that's the max you can go with the stock voltage. The Figure 2 shows the % of CPU usage in three conditions I mentioned above.

Figure 2

When OCed the CPU usage doesn't go more than 60%, but in case of Cool N Quiet enabled the CPU usage is around 90% most of the time.

Opening the case (CoolerMaster CM 690) from both the sides decreases the CPU temperature by 5°C and idle temperature hovers around 34°C-40°C (Figure 3). Will put more fans to improve the air flow, also will apply a new thermal paste some time soon. I am expecting an idle temperature around 30°C.

Figure 3

Here are a few screen shots of CPUID HWMonitor, CoreTemp64, CPU-Z:

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