Raspberry Pi 3 explained !



The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. It is a capable little device that enables people of all ages to explore computing, and to learn how to program in languages like Scratch and Python. It’s capable of doing everything you’d expect a desktop computer to do, from browsing the internet and playing high-definition video, to making spreadsheets, word-processing, and playing games.
What’s more, the Raspberry Pi  has the ability to interact with the outside world, and has been used in a wide array of digital maker projects, from music machines and parent detectors to weather stations and tweeting birdhouses with infra-red cameras. We want to see the Raspberry Pi being used by kids all over the world to learn to program and understand how computers work.


The Raspberry Pi Foundation is a registered educational charity (registration number 1129409) based in the UK. Our Foundation’s goal is to advance the education of adults and children, particularly in the field of computers, computer science and related subjects. See our stories page for more information about the Foundation’s charitable work.
You can read more about the history of Raspberry Pi and the people who have helped to make it the success it is today on our about page.
The Raspberry Pi 3 is here! Hopefully some of you were still surprised by the announcement . Over the past four years, the Raspberry Pi has sold eight million units – three million in the last year alone – and now on its fourth birthday a brand new upgraded Pi has been released. You can read absolutely everything you’d want to know about it in issue 43 of the magazine coming out on Thursday but for now we thought we’d give you the hard facts about this brand new Raspberry Pi.
And yes, it has wireless internet.


Raspberry Pi 3 CPU:

4× ARM Cortex-A53, 1.2GHz


Broadcom BCM2837


Broadcom VideoCore IV


1GB LPDDR2 (900 MHz)


10/100 Ethernet, 2.4GHz 802.11n wireless


Bluetooth 4.1 Classic, Bluetooth Low Energy




40-pin header, populated


HDMI, 3.5mm analogue audio-video jack, 4× USB 2.0, Ethernet, Camera Serial Interface (CSI), Display Serial Interface (DSI)
Wireless radio
So small, its markings can only be properly seen through a microscope or magnifying glass, the Broadcom BCM43438 chip provides 2.4GHz 802.11n wireless LAN, Bluetooth Low Energy, and Bluetooth 4.1 Classic radio support. Cleverly built directly onto the board to keep costs down, rather than the more common fully qualified module approach, its only unused feature is a disconnected FM radio receiver.
Wireless radio
There’s no need to connect an external antenna to the Raspberry Pi 3. Its radios are connected to this chip antenna soldered directly to the board, in order to keep the size of the device to a minimum. Despite its diminutive stature, this antenna should be more than capable of picking up wireless LAN and Bluetooth signals – even through walls.
Built specifically for the new Pi 3, the Broadcom BCM2837 system-on-chip (SoC) includes four high-performance ARM Cortex-A53 processing cores running at 1.2GHz with 32kB Level 1 and 512kB Level 2 cache memory, a VideoCore IV graphics processor, and is linked to a 1GB LPDDR2 memory module on the rear of the board.
The Raspberry Pi 3 features the same 40-pin general-purpose input-output (GPIO) header as all the Pis going back to the Model B+ and Model A+. Any existing GPIO hardware will work without modification; the only change is a switch to which UART is exposed on the GPIO’s pins, but that’s handled internally by the operating system.
USB chip
The Raspberry Pi 3 shares the same SMSC LAN9514 chip as its predecessor, the Raspberry Pi 2, adding 10/100 Ethernet connectivity and four USB channels to the board. As before, the SMSC chip connects to the SoC via a single USB channel, acting as a USB-to-Ethernet adaptor and USB hub.
USB Chip
Want to know just how much faster the new Raspberry Pi 3 is? See it pitted against its siblings in our benchmark series.
Offering support for multi-threaded operation – taking advantage of the four processing cores on the Pi 2 and Pi 3 – SysBench reveals just how far we’ve come since the original Raspberry Pi design. While single-threaded performance has improved greatly, the biggest gains go to multi‐threaded programs.
Python GPIO
The Raspberry Pi’s GPIO pins are most commonly used with Python, but this leads to a CPU bottleneck. In this test, a simple RPi.GPIO program toggles a pin as rapidly as possible while a frequency counter measures how quickly it actually switches.
Quake III Arena timedemo
The classic twitch shooter from industry pioneer id Software, Quake III Arena is heavily tied to the CPU performance of the Pi. The standard ‘timedemo’ was run at 1280×1024, high geometric, maximum texture detail, 32-bit texture quality, and trilinear filtering to obtain these results.
Developed by B.A. Wichman in the 1970s as a means of measuring a computer’s speed, the Whetstone benchmark concentrates on floating-point performance. Despite its age, the benchmark offers a good insight into the peak floating-point performance of a processor.
Where Whetstone measures floating-point performance, Dhrystone was developed in the 1980s by Reinhold P Weicker to measure integer – or whole-number – performance. As with its floating-point equivalent, Dhrystone is still a useful synthetic benchmark for comparing different chips.
Power draw
You can’t get extra performance without a few sacrifices. The Pi 3 draws the most power of the test group, but its extra performance means it spends more time at idle. Those looking for maximum battery life should look at the Model A+ or the Pi Zero as an alternative.
Subscribe now and get a code to order Pi 3 first!
Excited by all this and the possibilites of the Raspberry Pi 3? Want to get one right now? Subscribers to the print version of The MagPi can jump the queue at The Pi Hut to get priority handling on your orders. The good news is, if you’re already a print subscriber, you should be getting an email about it right now. The better news is, if you subscribe to The MagPi before Sunday 13 March 2016 you too can get a code to jump the queue. Subscribe today, jump the queue and never miss another issue.
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