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I'm happy that they're upgrading the pi, but it's not exactly lightweight computing in terms of power (they recommend a 27W PSU) or performance/watt (see: your
by isoprophlex 3y ago
I'm happy that they're upgrading the pi, but it's not exactly lightweight computing in terms of power (they recommend a 27W PSU) or performance/watt (see: your cell phone)
To me the charm of the raspi ecosystem was always in giving you a very low power, "always on, almost no power draw" linux environment. Oh well, I guess there's always the older versions or the zero for that.
- LeoPanthera 3y agoI don't think the newer models are supposed to completely supersede the older models. They are still available, and they still make them. If you have low power needs, you can use those.
- TaylorAlexander 3y agoIt's great for my farming robot though. We have plenty of power but want something small and reliable, and the Raspberry Pi Compute Module works wonders for this. More power will be welcome once they release a Compute Module version of the 5.
- qchris 3y agoIs there a reason you're not interested in those NVIDIA Jetson modules? Even excluding the GPU compute, I had thought the Orin boards were significantly faster than a Pi 4.
- TaylorAlexander 3y agoSo for what we’re using it for, which is handling Wi-Fi communications to a central server, handling CAN bus communications to four motor controllers, dealing with RTK GPS and calculating path following parameters for GPS paths, the raspberry pi is perfect. They are cheap, have excellent documentation, and until recently availability was no issue. Jetson boards are much more expensive. We do plan on making a computer vision add on for our robot which uses the Orin or similar to process images, but I find the raspberry pi perfect for sort of stitching the whole system together.
- dzhiurgis 3y agoAt this point something like beelink mini pc fits my needs much better - I don’t need tons of gpio ports, etc.
- fulafel 3y agoWould be interesting to see benchmarks of different PI generations at the same power level, assuming the older ones have dynamic power mgmt features too.
- foggywin 3y agoDid you read the blog post? :) "Raspberry Pi 5 consumes significantly less power, and runs significantly cooler, than Raspberry Pi 4 when running an identical workload. However, the much higher performance ceiling means that for the most intensive workloads, and in particular for pathological “power virus” workloads, peak power consumption increases to around 12W, versus 8W for Raspberry Pi 4."
- deleted 3y ago[deleted]
- moffkalast 3y agoAlright so 27W with heavy peripheral draw then? But 12 W still means it'll be drawing 2.4 amps instead of 1.6 when a random process decides to 100% it. I guess we can always underclock it. The real unanswered question is, does it finally have a damn sleep mode so it can save power when idle.
- pja 3y agoJeff Geerling measured 1.8W idle power draw. Based on my experience with previous Pis, I bet you’ll be able to drop that even further by turning off unused board components at boot time.
- moffkalast 3y agoTrue, I've gotten Pi 4s pretty low (< 1W), disabling the LEDs, Ethernet, HDMI, and USB controller, but it's never gonna equal a proper suspend.
- wkat4242 3y agoYeah my intel atom NUCs run at 5W idle and 10W load and they're a ton faster than a pi 4. Probably a pi 5 too. It's not very impressive. And that's with a real SSD.
- peteforde 3y agoNUCs cost hundreds of dollars, though. And they are probably 8x bigger, if you start stacking Pis.
- fbdab103 3y agoAt 27W that is a strong pass vs a NUC. If I go with a low power x86 NUC, I can run all software on it, and probably insert a SSD + additional RAM, for probably ~15W.
- pja 3y agoThat'll be peak power draw though: you have to spec the standard power supply to cope with the CPU running @ 100% & simultaneously feeding the 1G ethernet and all the USB ports at max power. Jeff Geerling measured 11W peak board power running benchmarks. Idle power was measured at 1.8W. They claim it will draw less power than the Pi4 for the same workloads.
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- stevenhuang 3y agoMax tdp rating is not idle power draw. Difference being if your workload now demands it, the increased power rating allows faster race to idle, and overall gain in power efficiency.
- zambal 3y agoPeak power draw is 12W, not 27W for the Rpi5 though.
- Narishma 3y agoIt's 12W, not 27.
- agumonkey 3y agoyeah, i miss the 5-10W early days
- dheera 3y agoThe worst part about it is they require a nonstandard, USB-C standard-violating proprietary power brick that does 5V5A. None of your 100W Anker or Apple power bricks will supply this. They'll do 12V3A, 12V5A, 20V5A, but not 5V5A. Yet another piece of nonstandard USB-C equipment.
- moffkalast 3y ago> When using a standard 5V, 3A (15W) USB-C power adapter with Raspberry Pi 5, by default we must limit downstream USB current to 600mA to ensure that we have sufficient margin to support these workloads. This is lower than the 1.2A limit on Raspberry Pi 4, though generally still sufficient to drive mice, keyboards, and other low‑power peripherals. This is also very uncool, since powering it through the GPIO header with a capable PSU won't trigger the PD signal and makes it impossible to draw any meaningful current through USB? I hope this blockade can be worked around in the boot config.
- teamonkey 3y agoThe blog post says you can override it.
- ThatPlayer 3y agoHow much power is safe to send through a GPIO pin? I'd imagine you'd want to make use of the Pi's 2 5V pins at that point.
- moffkalast 3y agoI mean theoretically dupont connectors are rated for 2.5 A so two of them could get it done, but the current will never be completely equal across both and one may get overloaded. Maybe the safest option would be to find some kind of barrel-jack-to-usb-c dongle. In practice I doubt it would be a real problem since you'd need to max out both the USB draw and CPU load at the exact same time to get the full draw.
- explodingwaffle 3y ago