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Raspberry Pi 4

raspberrypi.org

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Re: Raspberry Pi 4

#261

Post by ekianjo »

ggm wrote: post #169
bscphil wrote: post #112

Earlier quoted context omitted.

That's really too bad. It makes the 4K support useless for building an HTPC, which is a common use for the Pi. As far as I can determine, several of their competitors already support 10bit decoding, although specifics (about stable HDR support) are sometimes hard to come by.

As a fifty seven year old, I don't have 4k eyeballs. agree you have a limitation, not one which is holding me back since osmc does 720p just fine, for Olde telecine mp4s of B&W movies

If the screen is large enough about everyone gets 4k eyeballs.

Re: Raspberry Pi 4

#262

Post by vardump »

dchest wrote: post #242
vardump wrote: post #132

Earlier quoted context omitted.

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.

In the video here https://www.raspberrypi.org/magpi/raspberry-pi-4-specs-bench... they said they doubled the SD card performance.

Finally! First RPi SD card performance upgrade ever.

Doubled, so I guess around 40 MB/s. Still a far cry from fastest SD cards that can both read and write over 250 MB/s. Hopefully RPi4+ will improve on this. :-)

Re: Raspberry Pi 4

#263

Post by tmikaeld »

morphle wrote: post #153
tmikaeld wrote: post #84

Earlier quoted context omitted.

The USB 3.0 ports should give 100MB/s (Benchmarks show up to +300MB/s), and you can mirror two disks for RAID-1. With 4GB of RAM, you'd even be able to use ZFS.

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.

Re: Raspberry Pi 4

#265

Post by akerro »

dijit wrote: post #38
Moxdi wrote: post #31

No normal sized HDMI sucks, I don't want to buy another adapter, aside from that this looks really cool, can't wait to get one

C'mon, a mini-hdmi hdmi cable is 50kr ($5), surely you can just buy one and be done with it, no adapter needed. https://www.netonnet.se/art/ljud-och-bild/kablar/hdmi-kablar...

https://www.aliexpress.com/wholesale?catId=200003201&initiat...

Re: Raspberry Pi 4

#268

Post by Kliment »

eemil wrote: post #184
Moxdi wrote: post #31

No normal sized HDMI sucks, I don't want to buy another adapter, aside from that this looks really cool, can't wait to get one

I agree. No idea why they went with micro-hdmi, when mini displayport is more robust, more common, and royalty-free.

Almost certainly because the SoC they are using has native HDMI onboard, and no native DP

Re: Raspberry Pi 4

#269

Post by chongli »

tmikaeld wrote: post #84
kyriakos wrote: post #52

RPI would be awesome for NAS if you could connect SATA somehow

The USB 3.0 ports should give 100MB/s (Benchmarks show up to +300MB/s), and you can mirror two disks for RAID-1. With 4GB of RAM, you'd even be able to use ZFS.

With 4GB of RAM, you'd even be able to use ZFS.

Does it use ECC memory? If not, you should not use ZFS. Without ECC memory, ZFS carries the nasty risk of writing good data with a bad checksum, leading to data loss which would not occur in other filesystems (those that do not try to correct errors on the fly like ZFS).

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