Minimum hardware requirements for Windows 10 for Phones and Desktop
All modern Windows Phones will be able to upgrade
Microsoft yesterday announced the minimum hardware requirements for devices running the upcoming Windows 10. In terms of hardware, it seems that all current Windows Phone 8 (8.1) smartphones will be able to install, boot and run Windows 10.
Windows 10 supports screens from 3 to 7.99 inches and higher resolutions like QSXGA (2560 x 2048), WXQGA (2560 x 1600) and QWXGA (2048 x 1140). The minimum amount of RAM is just 512MB, while the storage capacity is 4 GB. Devices with 4GB need to have a microSD card installed.
High resolution devices need more RAM to be able to run Windows 10 properly. If Microsoft or another company releases a QSXGA phone, it will have 4 GB of RAM installed, while WXQGA and QWXGA devices require 3GB. FullHD (1920 x 1080) displays need 2GB of memory, just like WP8.1 (Lumia 930)
Microsoft announced support for more processors, so we can see phones powered by Snapdragon 208, 210, plus the hexa-core Snapdragon 615, 808 and Snapdragon 810. The new 14nm Cherry Trail processor will be also supported.
For Desktop PCs and tablets, the minimum hardware requirements for the 32-bit version of Windows 10 include 1GB RAM and 16GB storage, while the 64-bit OS need 2GB and 20GB respectively.
Source: Microsoft