MatijaM
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Joined: Tue Mar 03, 2015 11:09 am

PI2B V1.1 vs PI2B V1.2

Wed Oct 26, 2016 1:42 pm

Hello!
I try to buy some RPI2B computer and I found out that on Farnell (element 14) side they sell only new version V1.2 for a price of 38,83€.
In description is written "Previous versions of Raspberry Pi 2 Model B use the BCM2836 SoC, which contains a quad-core ARM Cortex-A7 processor. The Raspberry Pi 2 Model B v1.2 board uses BCM2837, which contains a quad-core ARM Cortex-A53 processor.".
So I check also the RS side and they are selling only old version V1.1. for a 31,88€. It is quite a price difference.
My question is if anybody know if the old version (V1.1) will go out of production or will stay?

Did anybody know if there is a big difference between this two processors (A7 - A53). With that I mean if I compile program (Lazarus) in version V1.1 (A7) will it work on new version V1.2?

Thank you for help,
kind regards, Matija

W. H. Heydt
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Re: PI2B V1.1 vs PI2B V1.2

Wed Oct 26, 2016 4:16 pm

The v1.1 version is out of production. It was the only board to use the '2836 SoC and--as a result--the volume was too low to justify continuing manufacture of the chip.

The Cortex-A7 CPU is an ARMv7, which is purely 32-bit. The Cortex-A53 is an ARMv8A and has 64-bit instructions as well as 32-bit. At present, Raspbian is a 32-bit OS. The Cortex-A53 executes instructions faster than the A7. There have been some test results posted that indicate that the Pi2B v1.2 (aka Pi2B2) is about 20% faster than the v1.1 at the same clock speed. If the program makes heavy use of the NEON (SIMD, I think) instructions, you may see up to a 60% speed boost on the new board.

The Pi2B2 will default to the same clock speed (900MHz) as the Pi2B, as compared to 1.2GHz for the Pi3B. This *should* eliminate or significant;y reduce the risks of throttling due to overheating.

The only thing to watch out for in switching to the new version of the board is to be sure you have current boot files and kernel. Other than that, the Pi2B2 is a direct "drop in" replacement for the Pi2B.

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DavidS
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Re: PI2B V1.1 vs PI2B V1.2

Wed Oct 26, 2016 7:52 pm

Other than being a lot faster at the same clock for a few reasons, the ARM Cortex-A53 in Aarch32 mode also breaks some older software do to dropping a few instructions/instruction forms. Not much of a concern if you only run Linux, though a significant concern for RISC OS that has a longer popular history on the ARM, and many binaries for which the source is lost to time.

In my testing most applications will perform around 1.3 to 1.5 times better on the ARM Cortex-A53 in the RPi 3B/new 2B than on the Cortex-A7 of the original RPi 2B at the same exact clock settings. Software that makes heavy use of NEON will perform between 2 and 3 times faster on the Cortex-A53 than on the Cortex-A7.

And most older software that fails on the Cortex-A53 and works on the Cortex-A7 is a result of using the SWP instruction, that is gone with the ARMv8, and that is usually simple to patch.
RPi = The best ARM based RISC OS computer around
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers

MatijaM
Posts: 2
Joined: Tue Mar 03, 2015 11:09 am

Re: PI2B V1.1 vs PI2B V1.2

Fri Oct 28, 2016 11:41 am

Hello

Thank you both for detailed explanation.
Down size is higher price (element 14). The old PI2B was 32€, new one if you buy 3+ is 36€ and PI3 when you buy 3+ is 34€.
It is the most expensive board.

Regards,
Matija

hippy
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Location: UK

Re: PI2B V1.1 vs PI2B V1.2

Fri Oct 28, 2016 12:56 pm

How does current consumption compare between Pi2B 1.1 and 1.2 versions - Does the lack of on-board WiFi+Bluetooth and a lower clock rate by default keep it the same ?

W. H. Heydt
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Joined: Fri Mar 09, 2012 7:36 pm
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Re: PI2B V1.1 vs PI2B V1.2

Fri Oct 28, 2016 1:38 pm

hippy wrote:How does current consumption compare between Pi2B 1.1 and 1.2 versions - Does the lack of on-board WiFi+Bluetooth and a lower clock rate by default keep it the same ?
I haven't seen any reports about power requirements. Looking at the Newark/Element 14 web page, in the "associated products" the show the most recent RPF PSU, which is 2.5A, but I think that's just because it *is* the current PSU. I have run Pi3Bs using a 2A supply without issues (including having a PiDrive attached). So until someone posts actual test results, it's all guesswork.

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