I all, I succeded in upgrading my Z4 with Rasp 5 and passive heatsink (GeeekPi from amazon). Everything went flawless. Flashed sd card with stable Oram. I have to work a little bit on the case, it won’t close properly because the screen touches the heatsink. I manager to fasten only the 4 posterior screw of the case. For now temperature stay below 50C°. tomorrow I’ll try to overclock.
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I would be interested in photos of the inside, if it’s not too much trouble of course.
Thank you very much, and congratulations on getting the RPi5 working in the Z4!
Kudos on you Z cross-grade challenge!
Thanks!! Now I can use Pianoteq at full potential and OsTirus!! One of my master keyboard happen to be VirusTi2 and I can confirm that they sounds identical 
. Thanks to all the exceptional programmers, engineers for putting together this wonderful piece of “nerd” hardware
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Congratulations !!! 
The fan is not too loud ?
Time for my traditional advert for the zynthian-pwm-fan service and it’s excellent handling of fan volume.
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Yes I’ve noted that.
But I didn’t read correctly the first post : it’s a passive heatsink 
I don’t see it as a performance itself more a framework on which we can frolic!
And the raspberry pi 5 have his own pwn fan port near the USB port apparently
The pi is becoming a bloated little thing…
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Hi @Spacedentist ,
How did you mount the hifiberry on the heatsink? Or is it just lying there? And did you unsolder the RCA and headphone plugs?
The hi-fi berry is just Lying there, I have to use an extension of the pin( see photo)! And the Zynthian I bought (used) was already without them, I think was a OEM custom version that they used in some Z4
I am on the verge of also going down this route.
Just wondering: Can one leave out the hifi-berry, and directly connect the pi to the zynaptik-1 board?
Successful here too! I tortured the backside of the case with a Dremel, which I had never used before, but hey, who’s looking at the back? Just more possibilities for airflow!
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Success here too. Didn’t do anything to the case and can reach all the ports. Pushed the ide cable and everything is closed.
The fan of the raspberry pi 5 is… Off moooooost of the time.
It start so fast !
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Just found this thread. Having recently bought an RPi5 for Zynthian experiments, this looks very exciting. Not to put down the V5, put there’s something nice and compact about the V4 so an RPi 5 upgrade appeals to me.
I recently bought an RPi5 with a passive cooler, which basically is a large block on the top which has thermal pads to the CPU and other chips. It looks more or less the same as the one that @spacedentist used in this thread. There is a cooler on the back too, which doesn’t have any thermal connection except via the screws.
I did a quick test connecting the RPi5 to the hardware and configuring it appropriately, just to see that everything played nicely together. The RPi5 is a tight fit when squashed sideways on top of the existing RPi4 but it worked well enough for testing.
Looking at the connectors, in terms of Zynthian, the only difference is that the USB and Ethernet ports are swapped, which will require a bit of operation (filing) on the case, and that there is no headphone output. The USB-C and HDMI connectors seem to be in the same place. So not a lot of work is needed on the case, really, it seems.
My plan is to remove the bottom cooler (because with it the RPi5 will sit too high in the case to match the holes for the connectors), and instead mount it like the RPi4 is mounted, on metal standoffs, which should transfer some of the head via the screws directly to the bottom of the case. The audio card needs to be mounted on an extender, and I’ve verified that even with an extender it is not too high up in the case - the audio board connector is the highest point, and it fits just under the Zynscreen.
There is the issue of how to anchor the analog board. Either drill holes in the headsink and use standoffs, or put small angle brackets against the back of the V4 case. I’m not really happy with letting it just sit on the connector.
Another option for increasing the cooling is to bolt the heatsink to the back of the V4 case using a couple of screws.
The question is if this will be enough in terms of cooling. My gut feeling is that it will be, especially since the case is fairly well ventilated. Opinions? @spacedentist @niels - Does the passive seem to be sufficient in the long run?
I never had any issues with that passive cooling, for my use it’s enough. Temperature never reached 60C. I fixed the passive cooling to the case with thermal adhesive. Have fun:notes:
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Haven’t had issues so far with this passive cooling. Though I have not been using it that much lately (too much programming).
As for attaching the hat, I just use two small bolts with nuts for fine-adjusment, which then rest on the cooler.
Good luck with your project!
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