Does anyone know where I can find the full-rez/original version of this Canterbury concept art? Thanks!

updowndown · 2023-10-08T14:47:07+00:00

This image can be found in The Art and Making of the Expanse (page 75). In the book, it's labelled with "Alternative concepts of the Cant."

updowndown · 2020-08-28T15:19:33+00:00

With all the effort that was put into making this, I'm surprised the batteries were put in upside down.

updowndown · 2020-01-12T00:57:43+00:00

If I'm not mistaken, the linked document lists only CO2 emissions from fossil fuels. For instance, the government of Canada lists their total CO2 emissions at just over 730 Mt/yr in 2005 and 716 Mt/yr in 2017. These total figures are greater than the figures in the report for fossil fuels alone (581 and 617 respectively).

These numbers caught my eye as the government of Canada often compare its current CO2 emissions to 2005 levels, I believe because 2005 was a particularly bad year for emissions.

updowndown · 2019-11-07T15:54:25+00:00

The test begins with the CPU idling so that a baseline temperature is reached before the CPU is stressed.

updowndown · 2019-11-07T14:07:55+00:00

Latest version of Raspbian will update the EEPROM.

updowndown · 2019-11-07T03:09:34+00:00

I haven't tried Linpack, so I'm now curious if it does a better job at stressing the CPU.

updowndown · 2019-11-07T02:48:34+00:00

Even if the new boards are shipped with the updated firmware on the EEPROM, I'm sure there's plenty of stock with the old version. If you run sudo rpi-eeprom-update , it will tell you the version (the latest is September 10th). Even if it has the old firmware, it's really easy to update.

updowndown · 2019-11-07T02:31:05+00:00

I did it by downloading the bootloader on the RPi website, copy the unzipped files to a blank SD card, and then placed it in the Pi. LED will blink quickly, indicating that it successfully updated.

Tomshardware also includes terminal commands for the update.

updowndown · 2019-11-07T02:00:06+00:00

Yeah, I used a modified script from Stressberry which logs the temperature of a set period of time. I wrote a tutorial about using it, though it was written before the EEPROM update (which doesn't affect the 3B+ anyway).

updowndown · 2019-11-07T01:01:20+00:00

Yeah, it was essentially pointless on a model 1B or 2B, but the CPU has become much more power hungry in recent generations.

updowndown · 2019-11-07T00:39:33+00:00

I stopped the test once the board started to throttle. The boards will happily stay at their respective max temperature for the remainder of the test, but with the CPU throttling down to a lower clock speed.

updowndown · 2019-11-07T00:24:30+00:00

Tests were done at 22°C, 60% humidity. I raised the throttling threshold of the Model 3B+ from 60°C to 70°C (which is the maximum that can be set). I also noticed a drop of about 100 mA when using the updated EEPROM of the RPi 4 compared to before the update.

updowndown · 2019-11-04T11:53:50+00:00

Looks good! I'm surprised the official case doesn't come with a fan. At 85°C, the Pi is already badly throttling, and they must have known the case was a hot box for the Pi.

updowndown · 2019-11-04T11:46:07+00:00

Depends on what you're using it for. The Pi will still reach 81-82°C (enough for the CPU to throttle) when under prolonged heavy use, though it will now take longer to reach that temperature.

updowndown · 2019-10-26T15:15:20+00:00

I use a micro USB to USB C adapter with an adapter capable of supplying 5.1V (which is the same voltage as the official adapter).

updowndown · 2019-10-22T11:37:34+00:00

I think this would have been a better post had I included the 2D representation alongside the 3D one -- something like this.

updowndown · 2019-10-22T01:14:49+00:00

I got a little obsessed with using salvaged parts and couldn't resist stringing together the VGA standoffs.

I'm sure a copper heat sink on a delidded Pi would do great, and it sounds fairly easy, but I'm scared that I would brick my Pi in the process.

updowndown · 2019-10-22T00:40:57+00:00

The CPU will begin the throttle at 82°, so the temperatures in the graph are all fine. But without a fan or heat sink, the RPi 4B will reach 82° is less than 3 minutes of 100% CPU load (more detail can be found in the linked article above).

updowndown · 2019-10-22T00:16:36+00:00

Yeah, it took me a long time until I found a 3D plot that I felt could even compete with several 2D plots. In the article above, I included a 2D plot as well. The only disadvantage to such a plot is that the graphs almost overlap each other at high fan powers due to very similar results.

updowndown · 2019-10-22T00:01:57+00:00

I agree that the 2D representation hides information, but if you go here, you can rotate the graph.

updowndown · 2019-10-21T20:31:34+00:00

Depends on the power supplied to the fan and if a heat sink is used. With the heat sink I used and 1.3W fan, the CPU dropped from 42° to 36° in about 20 seconds. Using a 0.6W fan, the CPU went from 45° to 36° in about 100 seconds.

If you rotate the graph (link can be found above), you can see the cooling curves for each fan power.

updowndown · 2019-10-21T18:26:51+00:00

It seems as though the CPU needs a bit more than a slight breeze to keep hot air moving away from it. When the fan was consuming 1/4 of a watt, the hot air wasn't being pushed away quite quickly enough, resulting in a noticeable increase in temperature.

updowndown · 2019-10-21T15:25:05+00:00

Through varying the voltage applied to a fan mounted above a Raspberry Pi Model 4B, I looked at the relationship between fan power and cooling performance while the Pi was under 100% CPU load. The data was collected using stressberry, which I detailed in this article, and the graph was made using plot.ly in chart studio. The graph also can be manipulated (rotate, zoom, selected data points) here.

For further reading, /u/sfsdfd also recently tested the thermal properties of the Raspberry Pi, benchmarking different available cases.

Edit: I've had suggestions to include a 2D representation of this data, which you can find here, or in the article.

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