OpenCPN-low-energy/hardware-limitations
Hardware limitations
We have created this page to expose the hardware power consumption limits on our measures laptops. In deed, the power consumption on our latest release is quite low and we were wondering if we can reduce even more the power used. It's actually quite hard to find precise specifications for the hardware. We were only able to retrieve consumption details only for the CPU and the hard disk.
The consumption of hardware expressed in Watt.
The HP EliteBook 2570p laptop
CPU : Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz
- C7 state : 2,9
- C6 state : 3,0
Hard disk : Hitachi HTS72323
- Idle : 0,35
- Stadnby : 0,08
Power consumed by the sector adapter : 1,5
Sources :
The Lenovo ThinkPad X230 Tablet
The CPU is exactly the same than on the HP laptop.
Hard disk : HGST HTS545032A7
- Seek : 1,8
- Read/Write : 1.6
- Performance idle : 1,5
- Active idle : 0,8
- Low power idle : 0,5
- Standby : 0,2
- Sleep : 0,1
Source :
Just a little maths
Our distribution is currently consuming a little bit more than 4,75 Watt on the ThinkPad.
When the sector adapter is plugged in, the system consume 0,039 Watt. So, CPU idle C7 + Hard disk low power idle + sector adapter = 3,439 Watt. This leave 1,311 Watt to run the system (when the screen is shutdown) and other hardware parts we haven't been able to identify.