I needed a cheap heatsink for my Raspberry Pi 3 that I use as a music player/server. To maximise performance, I wanted to overclock the computer for faster searching and handling of all my music. I’ve managed to overclock my main Stratum-1 NTP server to 1350MHz without any problems, but the dinky little aluminum heatsink was way to anaemic so I found a very cheap DIY solution to my problem. With this heatsink I can run the Raspberry Pi 3 at 1.5GHz all day at full tilt without any problems!
The results are in:
I’ve been very busy with different projects and one of them requires a custom enclosure. So I thought it would be a good excuse to learn Fusion 360. When the Raspberry Pi 3 came out, I did some overclocking experiments. But I settled with just passive cooling with some small aluminium heatsinks. But after seeing some experiments done with a larger copper heatsink combined with a cooling fan, I decided that I wanted to build a case with a silent fan with enough room for a large heatsink. I need it for my NTP server at ntp.jacken.se to get better performance.
Warning: as of yet, there is no official support for overclocking the Raspberry Pi 3, so you could damage your small computer. Just a reminder…
The new version of Raspberry Pi 3 was released yesterday, so I naturally had to get two. I’m using two as Stratum-1 NTP servers and with the old Raspberry Pi 2 I had hit the roof when it came down to getting better time resolution. So when I read that a new 50% faster version had been released, I raced to the nearest store and got a couple. I have one experimental NTP server that isn’t handing out time on the internet and another one that is the main server, connected to the NTP Pool Project.
I installed the experimental Raspberry Pi 3 first, so I could test performance and try to overclock it. And it went very well.
I have two Stratum-1 NTP servers using Raspberry Pi 2’s as servers. But the two setups are quite different.
This is my main NTP Stratum-1 server. It is available at ntp.jacken.se but it is also in the .se pool of ntp.org.
It’s a Raspberry Pi 2 I use a Raspberry Pi 3 that I have connected a U-Blox Neo-7 GPS receiver to. But i’m not using the 1 PPS signal coming out of the U-Blox. I have a Trimble GPSDO that I bought from eBay. The unit has two 10 MHz lab reference outputs and one 1 PPS output. But after measuring the
signal coming out from the GPSDO, I realised that the timing speed for the seconds “Tick” was only 10 µsec which is way to fast for the Raspberry Pi to pick up as an interrupt on one of the GPIO pins. So I built a pulse extender, making the pulse around 250 millisec instead. And now the Raspberry Pi picks up the pulse without problems. Some GPSDO units has the ability to set the pulse width by programming the unit via a serial port, but I can’t find that feature on this unit (which is poorly documented and was OEM made for some other manufacturer) so I had to do it with hardware. So how does it look when crunching the numbers on it
The last couple of weeks I’ve been busy building a
Raspberry Pi 2 Raspberry Pi 3 connected to my Trimble GPSDO using the 1 PPS output. The Trimble unit synchronises with the atomic clocks onboard the GPS satellites, and the precision is amazing! I bought the GPSDO to get a 10 MHz lab reference for my measure equipment, but after reading an article about Time-Nuts, people obsessed with measuring time as accurately as possible, and one of my friends showed me pictures of their new Stratum-1 NTP server rack he helped design, I was hooked.