Asus M2A-VM HDMI: AM2 mATX motherboard

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The maximum values allowed in the JumperFree section of the BIOS.

Notable BIOS Adjustments
+1.2VNBSB (chipset)
+1.20V to +1.50V in 0.10V increments.
DDR2 Voltage Control
+1.80V to +2.10V in 0.10V increments
CPU Multiplier
5x to 11.5x (maximum depends on the CPU)
CPU Voltage
0.800V to 1.550V in 0.025V increments
CPU Frequency
200Mhz to 400Mhz in 1Mhz increments
Memory Clock Frequency DDR2 400, 533, 667, 800
LDT Bus Frequency 1Ghz, 800Mhz, 600Mhz, 400Mhz, 200Mhz
UMA Frame Buffer Size 32MB, 64MB, 128MB, 256MB
CPU Fan Speed Warning Disabled, 800RPM, 1200RPM, 1600RPM

The BIOS offers voltage control options which are usually absent on mATX boards. The CPU can be undervolted all the way down to 0.800V and overvolted to 1.550V. Memory and chipset voltages are capped at +0.30V over default. LDT Bus Frequency (a.k.a. HT multiplier) is adjustable as is memory frequency, but memory timings cannot be manipulated at all. The maximum amount of memory one can allocate to the integrated video subsystem is 256MB. There is also a CPU Fan Speed Warning setting which can be set as low as 800RPM, so the board will not chirp if a moderately low speed fan is used to cool the processor; it can also be disengaged altogether.

The Hardware Monitor section of the BIOS.

The Hardware Monitor menu offers automatic fan control for the CPU fan in the form of Q-Fan. There are no customizable options for it however — it can only be turned on or off. CPU Fan Type can be set to either DC or PWM, indicating that it will function with both 3-pin and 4-pin PWM fans.

SpeedFan Support

SpeedFan's Readings screen.

When we loaded up SpeedFan, it reported five fans even though there were only three headers. After some investigation we found that Fan1 correlated to CPU_FAN, Fan2 to CHA_FAN, and Fan4 to PWR_FAN. The Core temperature reported was quite low, so we decided to ignore it. Temp1 rose 30°C when the CPU was put on load so we assumed this reading was the CPU temperature.

SpeedFan's reported values.

The only working fan speed control setting we could find was Speed02, which controlled the CPU fan. To enable this you must first enter the Advanced menu and change PWM 2 mode to "Software controlled" (note: if you set this to "SmartGuardian" it gives control to Q-fan). Once this is done, you will have a full range of control (0 to 100%).

With the system idle, using an AMD heatpipe cooler, Q-fan had the fan spinning at 1050RPM, which is approximately 45% in SpeedFan. When we ran CPUBurn, the CPU temperature peaked at 50°C, but the fan speed did not increase. We had to manually stop the fan and let it heat up before we noticed the fan start to ramp up, which began at around 52°C. Beyond this point, the fan speed increased quickly.

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