AMD AM1 (Athlon 5350) Real power consumption

Rationale

A few days ago I was building rack 19″ server based on AMD Athlon 5350 CPU. The main goal was to create a hardware set that will operate on wide supply voltage ranges (48V, 24V, 19V) and will be power efficient.

I decided to take a look at quite cheap AMD AM1 Athlon APU with TDP said to be 25W.

Testing platform

The hardware:

  • AMD Athlon 5350 CPU (4 cores, 2.05Ghz, 2MB L2 Cache)
  • MSI AM1I Motherboard
  • Crucial Ballistix 8GB (2x4GB) DDR3 1600MHz
  • Kingston SSDNow! V300 120GB
  • PicoBox Z3-ATX-200 Power supply unit.
  • Gembird rack 19″ 2U chasis with 2 fans connected to 12V

2015-09-03 15.30.48

Some facts about software:

  • Gentoo linux with kernel 4.0.5
  • Semi-tickless kernel with 300MHz ticks
  • Conservative CPU Speed governor with 800MHz to 2.05Ghz frequency

Testing hardware:

  • Standard DC power supply with voltage and current monitoring, set to 24.1V

The „idle” state: Operating system running, one ssh client connected, no tasks

The „full load”: Linux kernel make -j5

In idle state, CPU Speed governor set minimal frequency on all cores. For testing purposes I also forced maximal frequency to check for differences.

In full load state CPU Speed governor set maximal frequency of course, I also forced minimal for checking.

The results

The table below show total power consumption under different conditions.

Test condition Frequency (GHz) Current (A) Power (W)
Idle 0.8 0.67 16.147
Idle 2.05 0.67 16.147
Full load 0.8 0.90 – 0.93 21.69 – 22.413
Full load 2.05 1.35 – 1.40 32.535 – 33.74

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