oh allnet is so far allready i wonder where ameridroid is
Introduce ROCK 5B - ARM Desktop level SBC
I ordered from ameridroid early february 2022. I wonder when it will be shipped.
USB on the ROCK 5B E Key is available since most M.2 WiFi&BT cards uses PCIe for WiFi and USB for BT.
FYI:
I placed a pre-order on AllNetChina for 8GB version on 2nd february1:00AM (french time).
I just received two hours ago the link to buy it.
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Interesting why real Rock 5B have different mounting holes, CPU and memory locations then in most photos?
Main consern is if Raxda FAN 4012 (I’ve forgot to buy it) compatible with mounting holes and CPU
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The latest PCB version (ver 1.42) intentionally modified the mounting hole to be a more common configuration that is also used by a lot of PCH coolers, which will only make you get compatible coolers easier. It’s a 55mm distance mounting hole and you can get a lot of heatsinks that use the same mounting use this mounting hole, just be careful about the mounting direction(position of the “ears”) need to be the same as the official one.
There were few revisions of board, each with slightly reorganised elements, mounting holes, moved connectors etc. Of course accessories needs to be adjusted for this layout.
so will my pine64 rockpro cooler work with that modification
Probably not as the “ear” position is different
sad but luckly it is now also compatible with many chipset coolers
no no no no
rockpro64 fan is connected via 12V 2 wire JST 2,5mm
rock5 fan is connected via 5V 2 wire JST 1mm
it won’t fit into rock5 holes, it’s on different connector and voltage. Rock5 fan connector is same as the one used in common RTC batteries. 5V fans are sometimes used on laptop motherboards (but usually they are 3-4 wires).
After some time spent with Rock5 I agree with @jack that passive cooling should be ok. Fan is mostly off so large heatsing should be ok.
i didnt worry because it wouldnt fit in the connector i could solder that
but i cant drill another hole in the rock 5b
Even though fans may be “12V”, they can sometimes still run at lower voltages. I have a 12V 80mm fan sitting on top of my board, and powered off 5V or even 3.3V pins on the GPIO header it does a good enough job at cooling, and is pretty quiet too.
thats right its why i wanted to connect this fan also to the fan header because i know that this fan works at 5v and it pretty quiet at this voltage but sadly its not compatible with the mounting holes
12v 40mm and an adhesive 40mm heatsink works great.
PWM is a way to control fan speed whilst minimising torque loss.
Lowering the voltage is just another way but has less range as too low the fan will just stall.
All the 12v fans I have used on 5v work great and @ 41% speed are super quiet but provide much additional cooling over passive.
You do not want to put a 5v on 5v if no PWM as @ 100% 100% of the time will likely sound like a mini vacuum.
as far as i know the rock 5b on the fan header has pwm at 5v and is software controllable
If Your 12V fan gets enough airflow it should be ok, some will not even turn on.
I still think that it’s just easier to get any 40x40 good quality (meaning not too noisy) fan and mount it via two side holes and adhesive heatsink as @stuartiannaylor pointed. Such fans are easily to find on most of pi 4 cases.
Mount holes are about 40x55 something can be mounted on extension arms to that size.
A quick ebay https://www.ebay.co.uk/itm/304627003246 as had some thermal tape anyway and No2 (2.2mm x 16) just screwed in between the vanes.
Standard 40mm 12 on top
40x40 heatsink may be too big, here it’s 20x20 covering only rk3588:
white spacers are for 40x40 fan (which is way too big here, but this was quick setup).
I think that 30x30 heatsink should be ok unless there will be released some fitted large heatsink like the one for rock 4b
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yes thats right but if you dont center the cpu on the 40X40 heatsink then it would maybe work