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Old 2018-11-17, 10:39   #1
M344587487
 
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Oct 2017

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Default Raspberry Pi 3A+

https://www.raspberrypi.org/magpi/ra...cs-benchmarks/

  • A cut down version of the the 3B+ with the same CPU
  • Half the RAM at 512MB
  • Less board components for better out of the box power efficiency
  • Smaller board footprint at 67×56 compared to 85x56 for 3B+
  • Costs £22.30 compared to £30.10 for 3B+
Buying 10+ at a time the cost goes down to £20 per 3A+ board, so a compute cluster with 10 of them could be made for £250-£300 including networking, power delivery and storage. I don't know how that compares to x86 or other ARM solutions but it sounds like a fun project.
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Old 2018-11-17, 11:19   #2
paulunderwood
 
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Quote:
Originally Posted by M344587487 View Post
https://www.raspberrypi.org/magpi/ra...cs-benchmarks/

  • A cut down version of the the 3B+ with the same CPU
  • Half the RAM at 512MB
  • Less board components for better out of the box power efficiency
  • Smaller board footprint at 67×56 compared to 85x56 for 3B+
  • Costs £22.30 compared to £30.10 for 3B+
Buying 10+ at a time the cost goes down to £20 per 3A+ board, so a compute cluster with 10 of them could be made for £250-£300 including networking, power delivery and storage. I don't know how that compares to x86 or other ARM solutions but it sounds like a fun project.
I am very pleased with my 3B+, but I wonder if there is a 64-bit Gentoo image for the 3A+. I was able to compile straight 64 bit C, which had been running on X64, without any issues. It is now up for 128 days

Last fiddled with by paulunderwood on 2018-11-17 at 11:21
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Old 2018-11-17, 12:05   #3
VictordeHolland
 
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"Victor de Hollander"
Aug 2011
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Quote:
Originally Posted by M344587487 View Post
  • Costs £22.30 compared to £30.10 for 3B+
Does that include a power adapter, SD card and Ethernet cable?


This is what I paid for my total kit:

Raspberry Pi 3B+ €39.95
Heat sink kit €4.95
Micro-USB power adapter (5V 2.5A) €7.99
Official Raspberry Pi 3/3B+ case €8.95
Sandisk 32GB Ultra + adapter €16.99
----------------------------------------
€78.83 (includes 21% VAT)

Which works out to about ~$90 or ~£70

Ok, you could probably save some since you don't need a case and with smaller SDcard (without adapter).
But I would highly recommend the small heat sinks if you run it flat-out. And the 5V 2.5A micro-USB adapter is also nice, since it gives some headroom that most micro-USB power adapters don't have (most are 1A or 2A). If you've got some spare Ethernet cables than that could save you a few bucks also.
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Old 2018-11-17, 13:20   #4
M344587487
 
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Quote:
Originally Posted by VictordeHolland View Post
Does that include a power adapter, SD card and Ethernet cable?
...
Just the board. I've priced up what it would cost all inclusive for a self-contained solution using the cheapest parts I can find from farnell, ebay and ebuyer, in bulk where it makes sense:

16x wireless using SD cards
  • 16x (3A+, heatsink, micro USB cable, SD card): £373
  • Wireless router: £14.40
  • 2x 12 port USB charger: £22

Total: ~£410
Cost per pi: ~£25.60

16x wired using an external HDD and network booting
  • 16x (3A+, heatsink, micro USB cable, ethernet to USB adapter)
  • 2x 12 port USB charger: £22
  • 16 port switch: £29
  • 500GB external HDD: £29
  • 1 USB hub: £1

Total: ~£420
Cost per pi: ~£26.30

The wireless solution is a lot less messy hardware-wise but would likely be a nightmare to maintain. Relying on SD cards is not ideal but you cannot network boot over wifi. The wired solution has the benefit of using a HDD for storage but it's unfortunate that ethernet adapters need to be used. Network booting may not work over an adapter so that's a question mark. If it can work it'd be a neat solution, just a single HDD to worry about that can be easily backed up or even imaged to a new drive for a new cluster if desired. For a couple more quid you could use a 3B+ in the wired setup instead of one of the 3A+ to eliminate some potential headaches of using a USB hub. That pi could also be the only one that needs to communicate with the outside world for primenet, the rest can have wifi disabled to save some juice.
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