Parallella, Raspberry Pi, FPGA & All That Stuff

Anonymous

Thanks but following the

Thanks.  Your procedure seems quite similar to the instructions in the "tomshardware" link.  Following the instructions in the "tomshardware" link above and the instructions I posted about the nobtcmd.txt file I am good to go.  if you "df" the pi 4 running ubuntu 19 you will see that the boot partition is:  

/dev/mmcblk0p1    258095  138262    119834  54% /boot/firmware <----note not just /boot but /boot/firmware

 

 

PorkyPies
PorkyPies
Joined: 27 Apr 16
Posts: 197
Credit: 29,880,129
RAC: 29,417

Spotted this Pi case called

bowguy
bowguy
Joined: 2 Oct 17
Posts: 37
Credit: 11,047,759
RAC: 4,478

I have one.  Works great.  I

I have one.  Works great.  I have several things from c4labs.  Great to work with.

Anonymous

PorkyPies wrote:Spotted this

PorkyPies wrote:

Spotted this Pi case called the “8 slot cloudlet cluster case”. See https://www.c4labs.com/product/8-slot-stackable-cluster-case-raspberry-pi-3b-and-other-single-board-computers-color-options/

 

I noted that in the link you posted that the fans are at right angles to the Piz.  As hot as the Pi 4s get especially when crunching does anyone have an indication as to how efficient this cooling configuration would be?  I have already ditched two Pi 4 cases because they were not good at dissipating heat.  I have found that an 81 mm fan on nylon standoffs seems quite good at managing heat on a Pi#.

PorkyPies
PorkyPies
Joined: 27 Apr 16
Posts: 197
Credit: 29,880,129
RAC: 29,417

I had my own cases 3D

I had my own cases 3D printed. In my first iteration I used 40mm fans one above each Pi blowing air downwards and positioned above the SoC. In the 2nd iteration I put two 60mm fans between four Pi’s which works just as well as they move much more air than the 40mm fans.

First iteration is here: http://markjatboinc.blogspot.com/2017/12/4-pi-case-prototype.html

And the second iteration is here: http://marksrpicluster.blogspot.com/2018/03/pi4-case-mk-ii.html

Maybe bowguy can say how well the c4labs cluster case does at cooling.

Anonymous

At the bottom of this link is

At the bottom of this link is a Pi 3 with 3d printed plates and an 81 mm fan http://usefulramblings.org/?page_id=11997 .  I also post the following link for a "Pive" 3D print I did   http://usefulramblings.org/?page_id=6523 .  It took for ever to print the "Pive" and after all was said and done the Pi 3s ran hot.  I convinced myself that the air flow must be perpendicular to the plane of the board in order to move the "heat" away.  Horizontal air flow would not get the job done unless you had a mach 1 vacuum at the end of a horizontal tunnel.  

bowguy
bowguy
Joined: 2 Oct 17
Posts: 37
Credit: 11,047,759
RAC: 4,478

PorkyPies wrote:Maybe bowguy

PorkyPies wrote:
Maybe bowguy can say how well the c4labs cluster case does at cooling.

I run all my pi4's using POE with the foundation's POE hat.  It has a temperature controlled cooling fan.  Even running E@H on all 4 cores in a four pack cluster case without extra fans, they would run at 68 degrees or so.  Running them in the c4labs case with two of the four fans running, they run at about 64 degrees.  I need to find some USB to 5v/gnd cables to run the fans.  The case is nice with a little more room between the boards than my other case.  Having them vertical seems to help as well.

PorkyPies
PorkyPies
Joined: 27 Apr 16
Posts: 197
Credit: 29,880,129
RAC: 29,417

I guess the Poe hat probably

I guess the Poe hat probably makes it harder to dissipate the heat despite the 50mm fans on the front, due to the hat sitting so close to the SoC even though the hat has a small fan.

The Pi3 B+ in my 3D printed case are on 42 degrees C under full load (room temp 28 degrees). They have a copper heat sink installed as well.

The Pi4’s which have the Pimoroni fan shim are doing 51 degrees C (in the same room). They’re in a Pi3 case with the top off.

N30dG-ARM
N30dG-ARM
Joined: 20 Oct 17
Posts: 23
Credit: 22,094,059
RAC: 0

The RAC of my PI4(clocked at

The RAC of my PI4(clocked at 2Ghz), running FGRP seem's to be stable now. Scores at around 5500 Points.

https://einsteinathome.org/host/12796061

 

Still using the wisdom that I've created on my RK3399 as the wisdom generated on the PI4 is way slower. Not shure why.

bowguy
bowguy
Joined: 2 Oct 17
Posts: 37
Credit: 11,047,759
RAC: 4,478

N30dG-ARM wrote:Still using

N30dG-ARM wrote:
Still using the wisdom that I've created on my RK3399 as the wisdom generated on the PI4 is way slower. Not shure why.

Is your version available for download?  Does it work on pi3B+?

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