Posts filed under ‘Undervolting’

Undervolting Averatec 2370 (Turion64x2) using RMClock

Recently, I purchased an Averatec 2370 laptop with Turion64 x2 TL-50. I wondered if I could use RMclock to underclock and undervolt the Turion64 and what sort of effect it will have on the temperature and battery times.

First, I had to find out the Turioni64 x2 TL-50’s frequency and voltage range. I tried reading the literature on the AMD site, but it was hopelessly out of date. The white paper on the thermal characteristic is dated back to March 2006.

I launch RMClock and set it to monitor the voltage and frequency. I then open the Window’s Power Options object in Control Panel and set it to the following entry to “Always On”, which sets the computer to the highest frequency and voltage. I then set the power to “Max Battery”, which displays the lowest frequency and lowest voltage.

Configuration Frequency (Ghz) Voltage (V)
Minimum Power 0.804 0.800
Maximum Power 1.607 1.075

With that in mind, I ran RmClock, set the management to use Power Saving and set it to the smallest multiplier and voltage to 0.8V. I then ran CPU Burn and keep lowering the voltage. I managed to get it to below 0.700V before the computer crashed. I then set the management to Maximal performance and set it to the highest multiplier and the voltage of 1.075 v. I then keep lowering the voltage while running CPU Burn until the computer crash. I manage to get the voltage down to below 0.875V before the computer crashed. Finally, I set the management to Performance on Demand. I selected all of the multiplier and set the min and max voltage to the voltage to 0.700 V and 0.875 V. RmClock then adjust the immediate voltage from between low and high multiplier. Even though CPU Burn indicated a usable range of 0.7 – 0.875 v, the computer crashed when I attempted to install at 0.7 v. I upped the low end voltage to 0.712 v and the problem went away.

When I set management to “Performance On Demand”, the computer crashed. It turned out that half-step transitions is not allowed. Make sure you have the option unchecked in the Advance CPU Settings, P-Transitions Tab.

I then ran a test where I ran two copies of CPU-Burn (since we have two core, I needed to run 2 programs to get 100% cpu usage) and with wireless off. The computer is set to ran at the highest speed possible. The only difference between normal and undervolt is that normal runs at the default voltage of 1.075v while undervolt ran at the lower voltage of 0.875 v.

Configuration CPU Freq (Ghz) CPU Voltage (V) Battery Life (hours) CPU Temperature (C)
Normal 1.6 1.075 0:49 70
Undervolt 1.6 0.875 1:12 56

I was surprised by how much the temperature dropped when I reduced the voltage by 0.2 volts. By undervolting, one can extend battery life, reduce heat, while getting the same performance. This is a free lunch.

Undervolting potential will vary from chip to chip, so you’ll have to experiment to see how low you can go.

December 3, 2006 at 2:28 am 1 comment


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