ProDigit
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Joined: Tue Aug 30, 2011 1:24 am

Re: Whats the R-pis power consumption or TDP?

Fri Dec 09, 2011 10:49 pm

If you run a program like super pi for the cpu, and a graphically challenging game (where the pi has trouble providing fluid framerates); what is the TDP or total power consumption of the device under these circumstances?

gladoscc
Posts: 58
Joined: Sat Dec 10, 2011 3:32 am

Re: Whats the R-pis power consumption or TDP?

Sat Dec 10, 2011 5:00 am

I guess we\'ll have to wait to find out. It wont exceed the USB power limit of 500mah through

kme
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Re: Whats the R-pis power consumption or TDP?

Sat Dec 10, 2011 5:11 am

[quote]Quote from gladoscc on December 10, 2011, 05:00
I guess we\'ll have to wait to find out. It wont exceed the USB power limit of 500mah through[/quote]Nonsense. R-Pi isn\'t USB powered - it power by a DC 5 V supplier using a physical microUSB adapter, but it is a power plug, not a USB data plug.

Depending what you put into the USB ports - say, a 2½\" harddisk - you may reach 1000 mA (5 W) or even more.

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Jessie
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Re: Whats the R-pis power consumption or TDP?

Sat Dec 10, 2011 5:24 am

The highest figure I have heard spat out is 4W. I plan on having at least 2A avalible for the R-Pi and all its attached devices.

attiatte
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Re: Whats the R-pis power consumption or TDP?

Sat Dec 10, 2011 6:37 am

kme: The USB ports on the Pi don\'t have that much power, you won\'t be pulling anything near 5watts out.

I\'ve seen a few numbers thrown around, you can expect the power usage to be between 1 and 4 watts. The Wiki says 1 watt (5v, 200mA) - that\'s at idle, running it should be something like 320mA iirc.

kme
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Joined: Sun Sep 04, 2011 9:37 am

Re: Whats the R-pis power consumption or TDP?

Sat Dec 10, 2011 7:13 am

The previous stated 1 W for Model A and 2.5 W for Model B was before the switch to the microUSB PSU and the following, higher loss linear power regulator (as opposed to the previous switch mode version). The two numbers are full power for the bare units. Idle is in mW scale.

The are no official confirmed numbers what the attached USB devices may draw. IF R-Pi goes strict by the USB specification, each of the port may draw 500 mA. However, it\'s highly unlikely to happen.

So worst case is something like 3W (upped from 2.5 W from the early model, pure guesswork on my side) for the bare B + power consumption for each port. But this is really worst case.

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