The selling points here are a much faster boot-up time, and way faster overall performance than the Pi 3 - in fact the new Pi is comparable to an entry-level desktop PC, but obviously at a much cheaper price. The foundation promises a "complete desktop experience" with the upgrades it has included in the Raspberry Pi 4. It can decode 4K videos at 60fps using HEVC/H.265, render OpenGL ES 3.0 graphics, and can even output 4K video to a monitor. Raspberry Pi is already the best-selling British computer of all time.
While the low price of the Raspberry Pi has always been a big selling point for the product, it's worth mentioning that the $35 starting price doesn't include sales tax or, more importantly for those of us outside of the United Kingdom where the Pi comes from, import or shipping fees. To connect the single-board to the internet, you get an Ethernet port as well as 802.11ac Wi-Fi. The SoC has been redesigned from the ground up, replacing the 480Mb/s USB 2.0 channel with around 5Gb/s of external bandwidth - enough to drive the gigabit Ethernet port at full speed while also having enough grunt spare to upgrade two of the four now-independent USB ports to USB 3.0.
New RAM options have also been provided as you can now choose from 1GB, 2GB and the highest RAM option available now is 4GB LPDDR4-2400 SDRAM, which is a massive upgrade as previous models were limited to just 1GB of RAM.
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The Raspberry Pi 4, which starts at about R600, is capable of driving two independent screens running 4K-resolution content and has three times the processing power of its predecessor. For an extra $10 you can add another gig of memory.
In addition to the hardware improvements, the Raspberry Pi Foundation says the new PC will have an "extensively modernised user interface" including an updated Chromium 74 web browser. $55 gets you the fully-loaded model with 4GB.
Of course, being a Raspberry Pi, you'll want to buy a Starter Kit that comes with a new USB-C power supply, heatsinks, and everything else you'll need to run the low-powered computer. It is available in the Raspberry Pi Store (online) and at the company's store in Cambridge, UK, as well as from a few authorized retailers.