Raspberry Pi Forums

hojnikb

vithusel wrote: ↑
Tue Jun 25, 2019 3:25 pm
So, not sure if this is a mistake or not.

But looking at the manual for the Pi 4 i recieved today, it shows a 8GB ram variant???

Is this TRUE??

sounds like a typo.

hojnikb

Get a fast A2 sd card, no need for an SSD, unless you're planning on doing some serious I/O :) Don't waste money on an A2 card. Unless the device is A2 certified it will be slower than an A1 card. I and several others have already learned that lesson the hard way. You might be on to something. A2 a...

hojnikb

smed wrote: ↑
Tue Jun 25, 2019 10:24 am
Is there an easy way to distinguish how much ram the device has without booting it? My 4gb unit arrived this morning but can't see any numbers printed on it telling me the size.

you could probably check dram model number and work from there.

hojnikb

k-pi wrote: ↑
Tue Jun 25, 2019 10:14 am
Will get a 4GB RPi4 when they are (back ?) in stock - by then, hopefully it will be able to boot from USB3 SSD - & that should make for a decent desktop replacement.

Get a fast A2 sd card, no need for an SSD, unless you're planning on doing some serious I/O

hojnikb

how is soldering on flash memory a good idea? sounds horrible to me if you have to throw away your computer just because the flash chip had too many rewrites. :( Well, every smarthphone, tablet uses that exact type of memory and you dont exactly see mass defects because of that. If properly designe...

hojnikb

Functionally, eMMC is identical to SD cards (same bus protocol) it's just soldered to board, instead of being in a slot. how is soldering on flash memory a good idea? sounds horrible to me if you have to throw away your computer just because the flash chip had too many rewrites. :( Well, every smar...

hojnikb

EMMC really isn't a very good option IMO. Less reliable than SD cards over multiple writes and you cannot replace it when it fails, like you can with an SD card. Mind sharing some info/paper talking about that? Thanks in advance! Nope, personal experience. SD cards have wear leveling, EMMC generall...

hojnikb

It would be nice if raspberry pi had some sort of cooler tables and a more granular frequency/voltage control. Having more entries in dvfs table and some smart cpu scheduler, it would greatly improve sustained performance over time. Having just two frequency presets at 1.2/600Mhz and fixed voltage, ...

hojnikb

Use a good quality brand name flash drive (possibly one that uses 3D TLC or 2D MLC flash). Most cheap flash drives use 2d tlc and very simplistic flash controllers, that don't handle constant writes very well. So best bet is to have quality drive, proper PSU (so little voltage fluctuations). In this...

hojnikb

TLC at 1k cycles is nowadays only capable of such endurance using LDPC or some other form of smart ecc and dsp. With bch, you'd be lucky to get a few 100s cycles out of your run of the mill 15nm flash 3D is a different story, much better endurance due to much bigger cell sizes. Given the claims for...

hojnikb

W. H. Heydt wrote: ↑
Thu Jan 18, 2018 1:31 am

hojnikb wrote: ↑
Wed Jan 17, 2018 7:57 pm
Thats really a non issue, since most if not all device priorities sd boot over nand boot. So even with a dead eMMC you can always boot from sd card and use the board.
*cough* CM/CM3 *cough* (Not actually SBCs, but...)

thats just bad design though.

hojnikb

Seen claims before for FeRam, NVRAM, MRAM, FRAM etc And now NRAM, 3D Xpoint? I will believe it when I can buy them. We need something new, TLC has been as pushed as far as it can go? It would not surprise me if some SD cards have TLC but say they are SLC. Hence destroyed SD'S? 100 cycles for 15nm T...

hojnikb

https://en.wikipedia.org/wiki/Flash_memory SLC - Single Layer cell -100,000 cycles TLC - 1000 cycles. https://www.cactus-tech.com/resources/blog/details/why-slc-sd-cards-are-critical-to-industrial-systems Buy cheap memory get cheap memory? Guess I know which cards I would rely on more. What is the ...

hojnikb

Of course the trade off is that when the uSD card wears out any user can replace it while most users can not r eplace a dead eMMC module easily. Yes, I would never buy an SBC with on-board storage for that reason. The Odroid C2 by the way, uses removable eMMC cards as well as uSD cards (you can boo...

hojnikb

hojnikb, There are plenty of raspberry like boards out there that don't have issues with sd cards Really? Can you name one? Can you link to any evidence that is has no such issues? No, don't do that. This is the wrong place. Let's just say I find it hard to believe. You could PM any such evidence i...

hojnikb

hojnikb, There are plenty of raspberry like boards out there that don't have issues with sd cards Really? Can you name one? Can you link to any evidence that is has no such issues? No, don't do that. This is the wrong place. Let's just say I find it hard to believe. You could PM any such evidence i...

hojnikb

None of the Raspberries have any power saving feature. It's not needed when it costs less than £5.00 per year to run one 24/365. Well, not a very good argument. You could have raspberry pi in a battery powered environment, where every W counts. Or in the case of rpi3, you could increase sustained p...

hojnikb

Have you tried the SD card overclock.(or more run a UHS1 card at the faster rate.) I'm still unsure how an SD card write can alter the file itself. How many cores is it using? 20% may be getting near a maxed out single core and the CPU is used to code the file on the fly and not the actual camera ?...

hojnikb

If you have trouble with SD cards, you can always switch to a different board. There are plenty of raspberry like boards out there that don't have issues with sd cards (some even come with eMMC!). Better switch over than being stubborn with a single board.

hojnikb

How far can you push it on 1.4V voltage ?

hojnikb

http://elinux.org/RPiconfig#Overclock_stability_test To be honest that's not really going to stress the chip. You'd be much better running quake or kodi. I do have a much better stress test, with a script that will identify the highest arm_freq, core_freq and sdram_freq that are reliable for your p...

hojnikb

Model/Speed A read_ring_osc(2)=3.157MHz (@1.20V) B(1) read_ring_osc(2)=2.935MHz (@1.20V) B+ read_ring_osc(2)=2.865MHz (@1.20V) B(2) read_ring_osc(2)=2.754MHz (@1.20V) Turns out my fastest system is the one I use the least. Just my luck. :lol: Set overvoltage to 8 and overclock that baby. Should hit...

hojnikb

You don't need a heatsink. It's mostly gonna cool the ram (since its a PoP design) not the SoC itself.

I've got my Pi overclocked to 1100Mhz with 1.35V and it works just fine under heavy load. Never went more than 65c

hojnikb

While f2fs is indeed better suited for flash devices, such as memory cards, i don't think it does any caching in such a way i'm describing in the original post. The whole idea (as i understand it) is to cache small writes to a buffer and then dump them to device, whenever its best possible. Since du...

hojnikb

So i've found this write buffer for small small writes (which are painfully slow on pretty much all dumb flash devices) https://wiki.cc.gatech.edu/epl/index.php/FlashFire Windows version works really great on slow ssds (in particular those find in early Eee PCs)... Now my question is.. Since there a...

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Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

Re: Raspberry Pi 4 Thread - general discussion

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Re: When will Raspberry Foundation admit that the Pi destroys your SD cards?

Re: When will Raspberry Foundation admit that the Pi destroys your SD cards?

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4K write buffer