[James J. Guthrie] just published a rather formal announcement that his 4-node Raspberry Pi cluster greatly outperforms a 64-node version. Of course the differentiating factor is the version of the hardware. [James] is using the Raspberry Pi 2 while the larger version used the Model B.
We covered that original build almost three years ago. It’s a cluster called the Iridris Pi supercomputer. The difference is a 700 MHz single core versus the 900 Mhz quad-core with double-the ram. This let [James] benchmark his four-node-wonder at 3.048 gigaflops. You’re a bit fuzzy about what a gigaflops is exactly? So were we… it’s a billion floating point operations per second… which doesn’t matter to your human brain. It’s a ruler with which you can take one type of measurement. This is triple the performance at 1/16th the number of nodes. The cost difference is staggering with the Iridris ringing in at around £2500 and the light-weight 4-node built at just £120. That’s more than an order of magnitude.
Look, there’s nothing fancy to see in [James’] project announcement. Yet. But it seems somewhat monumental to stand back and think that a $35 computer aimed at education is being used to build clusters for crunching Ph.D. level research projects.
A few months ago we were lucky to get the scoop on a new Raspberry Pi a few days before it was officially announced. This model ended up being the Raspberry Pi Model B+, with improvements that included more USB ports, not-dumb mounting holes, more GPIOs, and a decent microSD card connector. Today, we’re proud to leak another revision to the Raspberry Pi ecosystem – the Raspberry Pi Model A+
There really aren’t many details for this new revision of the Raspi, but we can make some educated guesses. The new model features the same not-dumb mounting holes as the B+, 58mm wide by 49mm wide. All the ports are moved to two sides of the board, and the analog audio and video are combined into one 3.5mm jack. Like the normal Model A, this one doesn’t have Ethernet and only one USB port, but the improvements seen from the B to the B+ are still there: a good microSD card socket is on the back, and the 40-pin GPIO header replaces the old 26-pin header. There’s no word if the A+ will feature a RAM upgrade – when the Model B was ramping up production The Foundation decided to bump the RAM up to 512MB. This could happen with the A+, but we’re not holding our breath.
There’s no word when the A+ will be announced, or when it will start shipping. The educated guess would say tomorrow morning, with an analysis of how much power this thing consumes a week after it starts shipping.
Depending on who you believe, yesterday someone either broke an NDA or was the lucky recipient of an Element 14 shipping error. Nevertheless, we were lucky enough to get a glimpse at the new Raspberry Pi Model B+. Today, everything is live, and Adafruit has a great teardown of what’s new, what’s changed, and what’s completely different in this new board.
The biggest question about this new Pi was the CPU: the Broadcom SoC in the models A and B are looking a little long in the tooth right now, and an upgraded CPU would be a very, very welcome addition. There is no change. This is the same 700 MHz Broadcom chip with 512MB of RAM. There will not be a ‘magical, because you’re awesome’ RAM upgrade the original Model B saw early in production, either – there simply aren’t enough address pins in the SoC.
Despite not having an upgraded CPU, there are some neat features that addressed the complaints of the original Pi: The standard sized SD card socket is replaced with a microSD card socket that won’t stick out over the edge of the board. The ports are rearranged, with the analog video out on a TRRS plug with the audio. There are now four USB ports and an Ethernet port thanks to this chip, and mounting holes galore: they’re M2.5 holes in a square 58mm wide and 49mm high. Also included in the B+ is a completely redesigned power supply – the jumbo linear regulator is gone, replaced with an all-around better power supply.
The biggest change for anyone looking making a project with the Pi is the expanded GPIO header. This is a 40 pin header, with the ‘top’ pins identical to the original 26 pin header. Yes, all your existing Pi plates/shields/whatevers will still work. The new pins on this header include nine more GPIO pins, the I2S pins for the Wolfson audio card, and a pair of pins for an ID EEPROM. Connections to an ID EEPROM have been a feature of the BeagleBone for a while now, and this will allow the Pi to configure the appropriate I/Os and kernel modules at boot, depending on what Pi Plates are attached.
The best part about this is the price – it’s the same as the OG Model B. Using the same case as you old Model A or B is out of the question, but that’s totally what Kickstarter is for, right? You might want to grab one of those, because this is probably going to be the form factor for the upgraded Raspberry Pi 2.0 that will probably be released in a year or two.