5 ms·

Yeah, if you look beyond the Raspberry Pi there are quite a few options, just things to keep an eye on are: - MicroUSB for power - limits you to 2A, very bad

by trome 10y ago

Yeah, if you look beyond the Raspberry Pi there are quite a few options, just things to keep an eye on are: - MicroUSB for power - limits you to 2A, very bad - Crap/slow eMMC - Look at random I/O as main method of judgment - USB Hubs where they shouldn't be needed - OrangePi+ 2 made this mistake, get OrangePi+ 2e instead - Poor board thermals - a good SBC will have a copper layer below the SOC to spread the heat across the PCB - Non-mainline support - It might be great hardware, but its a dud without software - Bad Power Supply - A phone charger is not a SBC power supply - Slow MicroSD - Buy Samsung Evo 32GB cards, test immediately. Even with a good brand like these, 2 out of every 5 won't even do 10MB/s of write, or 2MB/s of random I/O, making them not a class 10 card. Exchange the bad ones, buy used if your on a budget.

Already__Taken 10y ago
> Slow MicroSD - Buy Samsung Evo 32GB, test immediately Aren't there a lot of counterfeits that's why?
- trome 10y ago
  Eh, that is only part of it, my comments were referring to genuine MicroSD cards, essentially Samsung's Evo cards are made using flash from their semiconductor fabs, and tend to have higher quality over Sandisk and basically all others since they buy random lots of flash off the open market. That being said, Samsung isn't performance testing each microsd card, so you need to bench them ASAP when you get them to make sure your getting above 2MB/s in random I/O and around 20MB/s in write speed. If they fail that test (which if your buying more than one, you'll run across), just get it exchanged with the seller, no reason to hang onto a poorly performing card.
gravypod 10y ago
> Poor board thermals - a good SBC will have a copper layer below the SOC to spread the heat across the PCB If that's the only thing wrong you can buy a few chip heat sinks and set it in a thermal epoxy to turn the entire thing into a thermally massive block. Even crap air flow should clean that up and then you don't need a case. You can also thermal glue it to a large bit of metal if you have a metal desk or something
- trome 10y ago
  That is both added cost and your still missing cooling the underside of the SOC. Most people will not take steps like that, so you end up with boards clocked at 900mhz instead of 1200mhz cause groups like Armbian don't want to burn up the SOC on users boards that don't have a heatsink. Other bad moves are dumping 1.3v or 1.4v into the SOC and not allowing the user to adjust that voltage, cause then the board is just generating heat needlessly instead of running at 1.1v or so.

by trome 10y ago

Already__Taken 10y ago

> Slow MicroSD - Buy Samsung Evo 32GB, test immediately Aren't there a lot of counterfeits that's why?

trome 10y ago
Eh, that is only part of it, my comments were referring to genuine MicroSD cards, essentially Samsung's Evo cards are made using flash from their semiconductor fabs, and tend to have higher quality over Sandisk and basically all others since they buy random lots of flash off the open market. That being said, Samsung isn't performance testing each microsd card, so you need to bench them ASAP when you get them to make sure your getting above 2MB/s in random I/O and around 20MB/s in write speed. If they fail that test (which if your buying more than one, you'll run across), just get it exchanged with the seller, no reason to hang onto a poorly performing card.

gravypod 10y ago

> Poor board thermals - a good SBC will have a copper layer below the SOC to spread the heat across the PCB If that's the only thing wrong you can buy a few chip heat sinks and set it in a thermal epoxy to turn the entire thing into a thermally massive block. Even crap air flow should clean that up and then you don't need a case. You can also thermal glue it to a large bit of metal if you have a metal desk or something

trome 10y ago
That is both added cost and your still missing cooling the underside of the SOC. Most people will not take steps like that, so you end up with boards clocked at 900mhz instead of 1200mhz cause groups like Armbian don't want to burn up the SOC on users boards that don't have a heatsink. Other bad moves are dumping 1.3v or 1.4v into the SOC and not allowing the user to adjust that voltage, cause then the board is just generating heat needlessly instead of running at 1.1v or so.