Raspberry Pi 3 Model B vs. 3 B+: Which should you buy?

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Changes to the network interface and a small processor revision sound minor but could make a difference for your project.

We don’t expect to see an all-new model Raspberry Pi until late 2019 according to the company’s roadmap, but the Raspberry Pi Foundation released a bit of a version bump with the new Raspberry Pi 3 B+. In the smartphone world that + means you should expect something bigger, but in this case, the differences are a bit more nuanced. Let’s take a peek at what’s new for the 3 B+ and see if you should look for one to build your next project instead of just grabbing a tried and trusted Raspberry Pi 3 and start wiring things.

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Raspberry Pi 3B vs. 3 B+

Tiny cosmetic changes aside, there are two important differences between the 3 and the 3 B+: a new network interface and a slight processor revision. These changes aren’t enough to rip out your Pi from any existing projects, but they could matter for whatever you have planned next. Especially if you’re building your own Internet of Things device like a remote sensor or camera controller.

The changes to the network interface are a much bigger deal than the SoC bump so we’ll start there. The model 3 B+ brings three important changes to networking:

  • PoE (Power over Ethernet) is supported via a stand-alone 4-pin connector. Of course, the connector also supports the use of a HAT (Hardware Attached on Top) and the company’s GitHub page has been updated with the new details.
  • Gigabit Ethernet is supported by the new Ethernet connector. Speeds on the Pi’s slim hardware won’t reach the maximum, but it’s claimed to average around 300Mb/second. No more jamming up your traffic by having a slow 100Base "Fast Ethernet" device on your 1000Base network.
  • Dual-band 802.11ac Wi-Fi is now standard via a new wireless chip, and the same antenna design used on the Pi Zero is built into the PCB. The placement and design on the new chip also allow the B 3+ to meet the FCC’s modular conformance compliance requirements which would eliminate the usual long wait times for approval if you’re thinking of integrating a Pi into a commercial product.

The processor upgrade isn’t enough to warrant a new part number, but the SoC package itself has visibly changed so you might need a new heatsink of your project calls for one. The revision (marked as a020d3 if you happen to have access to the Broadcom specifications) brings one thing to the Broadcom BCM2837 SoC — it’s now clocked at a maximum of 1.4GHz instead of 1.2GHz.

A 200 MHZ jump usually brings a significant performance increase. In early tests based on a beta release of the OS, pure data-driven benchmarks like verifying prime numbers show a performance boost of 15%. Unfortunately, the CPU is rarely the bottleneck on a small single board computer and without changes like a new storage interface adapter or a bump in the SoC cache, you probably won’t see much real-world benefit.

Do I need a model 3 B+?

The big draw though, and why you might want to consider sourcing a Raspberry Pi B 3+, is PoE. In case you aren’t familiar, PoE allows you to power a device over its Ethernet connection. It’s a boon to DIY’ers and Makers because it means you only need to run a single wire for networking and power and that you can control the power programmatically without wiring in any sort of switch or relay.

You probably don’t need the 3 B+, but you should buy it anyway.

With a standard model 3 B, you would have to use an enclosure big enough to accommodate a special splitter or use an enclosure that has PoE integrated. That’s an increase in cost and takes away a bit of the usability a small single board computer has due to its size. If you’re planning on building any sort of remote smart IoT box you’re better served to buy a 3 B+. If you don’t use PoE now, you still have the option in the future without any changes to the board.

The changes to the network interfaces also mean a 3 B+ is the right board if you’re building your own NAS or media streaming box using a Raspberry Pi. Clients can take advantage of the faster and wider Wi-Fi connection, and the new NIC supports 9KB "Jumbo" frames in addition to a 1000Base-TX network. Jumbo frames allow for more than the standard 1500 bytes of Ethernet payload per packet, and in this case payloads up to (theoretically) 9 KB (9000 bytes) are supported. These changes mean that any streaming box driven by a Raspberry Pi 3 B+ can send and receive data faster over an Ethernet connection.

More: How to install Kodi on the Raspberry Pi

The best thing about the changes between the two is that all accessories, like enclosures or HATs, built for the model 3 B will also fit the model 3 B+. Even if your project doesn’t require a new NIC or PoE, that means you could buy a 3 B+ anyway in case you want to use it for something else in the future. And that’s what I would recommend. You can pick up a kit that includes the board, a power supply with its own noise filter, a clear enclosure, and two aluminum heatsinks for about $50 from Amazon. If you only need the board itself, you can get one for about $40 from Amazon. These prices are just a dollar or two more than the model 3 B, so it’s a no-brainer unless you have a specific need for the wireless and network chips used on the older model.

Whatever you buy, do us all a favor and share once you’re finished doing something cool with it!

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July 16, 2018 at 06:05AM