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Raspberry Pi 4

raspberrypi.org

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Re: Raspberry Pi 4

#401

Post by megous »

HeadsUpHigh wrote: post #218
hlandau wrote: post #17

>Are you still using VideoCore? >Yes. VideoCore 3D is the only publicly documented 3D graphics core for ARM‑based SoCs, and we want to make Raspberry Pi more open over time, not less. This stated intention and rpi.org's actions are simply not isomorphic. If they want to make Raspberry Pi more open, firstly, why do they publish only abridged (read: fake) schematics? [1] Secondly, why was rpi.org caught adding DRM chip…

My understanding is that they mean open in software not hardware.

These SBCs are for development. Failing to publish the schematics makes evaluation harder.

Re: Raspberry Pi 4

#403

Post by vardump »

discreditable wrote: post #400

I wish they'd integrate PoE (without the hat). That chip they're using appears to support it. http://www.trxcom.com/Product/product/id/353.html

I guess they needed to drop that and a lot more to hit $35 price target.

Re: Raspberry Pi 4

#404

Post by MisterTea »

throw0101a wrote: post #398
cyberjunkie wrote: post #3

Oh my! This is such a crazy upgrade. I've been using the RPI2 as my HTPC/NAS at my folks, and I'm so happy with it. I was itching to get the last one for myself. USB 3.0! Gigabit Ethernet! WiFi 802.11ac, BT 5.0, 4GB RAM! 4K! $55 at most?! What the!? How the??! I know I'm not maintaining decorum at Hacker News, but I am SO mighty, MIGHTY excited! I'm setting up a VPN to hook this (when I get it) to my VPS and then do…

> Gigabit Ethernet! Does it have PoE? Having to deal with one less cable would be nice. Especially given that the latest spec, IEEE 802.3bt from September 2018, now allows for up to 100W per port: * https://en.wikipedia.org/wiki/Power_over_Ethernet

There is an official PoE board that fits the pi 3+ which uses a 4 pin header by the ethernet jack to grab power. The pi 4 appears to have the same header.

https://www.raspberrypi.org/products/poe-hat/

Re: Raspberry Pi 4

#405

Post by morphle »

tmikaeld wrote: post #263
morphle wrote: post #153

Earlier quoted context omitted.

not these USB 3.0 ports. Connected with shared 4 Gbps, they only run at 4/5th, 1/2 or less of the full 5 Gbps speed.

Which means, 2 ports and two drives (not ssd) should give at least 100MB/s each. Maybe I wasn't clear enough on that. - 1Gbit ethernet - 1Gbit USB 3.0 port 1 - 1Gbit USB 3.0 Port 2 Total: 3Gbit of 4Gbit, having some margin to spare.

It has:

1 Gbit Ethernet over RGMII

4 Gbit PCIe Gen 2 shared by 2 USB 3.0 (so 1x 4 gbps max or 2 x 2 Gbps shared)

Total: 5 Gbits, no margin to spare

Re: Raspberry Pi 4

#406

Post by dwater »

wrong_variable wrote: post #270
hyperdunc wrote: post #119

Earlier quoted context omitted.

I'm using an old SATA SSD with a USB3 adapter I got off ebay. Performance is significantly better than an SD card.

Do you boot Raspbian from a SATA SSD ?

I have the same setup on 2 pis, and even on a 3b+ I've found it's easier to just put a cheap little microSD card in to hold the bootloader than to try to get USB boot working.

Re: Raspberry Pi 4

#407

Post by pb82 »

elliotpage wrote: post #185

Can't wait to buy this, boot it up, play with it for four hours, then stick it in the same desk drawer with the other Pis I have bought over the years. (The upgrades look great, just my attention span is not so great)

I use one of my Pis as a PulseAudio network sink that lets me stream music to it from every computer in the house. Not the most creative use but maybe some inspiration.

Re: Raspberry Pi 4

#410

Post by vardump »

vardump wrote: post #132
leemailll wrote: post #39

The full specs and benchmark link: https://www.raspberrypi.org/magpi/raspberry-pi-4-specs-bench...

Missing: SD card performance benchmark. Previous models could only read about 20 MB/s or so, while the modern SD cards can do 10x (maybe even more) that. Is there any improvement in this? It's pretty important as RPi usually boots off it.

Found from the new docs:

https://www.raspberrypi.org/documentation/hardware/raspberry...

"The Pi4B has a dedicated SD card socket which suports 1.8V, DDR50 mode (at a peak bandwidth of 50 Megabytes / sec). In addition, a legacy SDIO interface is available on the GPIO pins."

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