Reaching the $35 price point was difficult however, and one peculiarity of the Raspberry Pi is its downright ancient ARM11 CPU inside the Broadcom BCM2835 SoC. While the ARM11 CPU was a watershed moment for mobile computing when it launched (it was at the heart of the original and 3G iPhones launched in 2007 and 2008), to continue using it in 2015 is a large concessinon. Not only is it slow, but the ARM11 core does not use the most popular ARM ISA, ARMv7, and instead relies on the older and less popular ARMv6 ISA. Thus, most software does not run natively on the Pi and must be recompiled.
Many online software repositories maintain ARMv7 sections for everything-but-the-Pi as well as a special Raspberry Pi ARMv6 section. Considering the popularity of the Raspberry Pi, this actually works okay, but the lack of a modern CPU has left the door open for competitors. Projects such as Vero, ODRIOD, and Imagination’s CI20 have all differentiated themselves with much more powerful and modern CPUs albiet some of them at higher prices.
This morning, the Raspberry Pi foundation changes that by introducing Raspberry Pi 2 at the same $35 price point. Working with Broadcom, the Raspberry Pi foundation has attempted to maintain as much compatibility as possible by changing only two features of the design. The new Broadcom 2836 SoC replaces the older 2835 SoC, but is nearly identical other than the CPU. The 700 MHz ARM11 CPU is replaced with a quad-core set of 900 MHz ARM Cortex-A7s, which use the more standard and modern ARMv7 ISA. Additionally, the memory has been doubled and increases from 512MB to 1GB. Otherwise, the Pi 2 is exactly the same as the Raspberry Pi 1 B+.
This is a huge announcement by Microsoft, as providing compatibility for arguably the most popular maker device cements their messaging that Windows 10 can run on anything and they won’t be missing out on IoT. The Windows 10 experience on Raspberry Pi 2 will likely be very similar to Windows RT - i.e. no desktop apps. However, Microsoft is doing the work to make sure that universal applications that run on the Surface Pro 3 also run on the Raspberry Pi 2. This is a key part of the Windows for IoT initiative.
While the ability to run Windows 10 is big, it is also important to keep performance expectations in check. In our original Surface review, we noted that the device felt slow and performance benchmarks were low - and that was with much faster 1.3 GHz ARM Cortex-A9 CPUs. Windows software has improved tremendously since then, but there is no getting around the fact that 4x Cortex-A7s at 900 MHz will be a new low for Windows. However, Windows Phone has used such processors before, so perhaps Microsoft's Windows 10 will carry forward enough optimizations to surprise us. Additionally, I imagine a lot of Raspberry Pi 2 Windows 10 devices will be running purpose-built maker applications, hiding task switching or general OS use performance.
ARM11 轉做A7 四核
512MB Ram upgrade到1GB
Microsoft official win10 support
well it suppose to be a low cost device for start up projects/ as low power controllers
it is the interface and online resources that matters, not performance and end user experience
or else ppl can keep asking about why not 8 core? why not atom? why not celeron, etc