World of Warcraft has come a long way from it's debut in 2004, that is almost 12 years ago! Much has changed in that time and yet it is still the dominant MMO game. With upgrades done in the new expansion we got new system requirements.
As posted on Battle.net, the minimum system requirements are:
OS: Windows XP/Windows Vista/Windows 7/Windows 8/Windows 10 with latest service pack
CPU: Intel Core 2 Duo E8500 or AMD Phenom II X3 720
GPU: Nvidia GeForce GT 440 or AMD Radeon HD 5670 or Intel HD Graphics 5000
RAM 2GB
And the recommended requirements are:
OS: Windows 10 64-bit with latest service pack
CPU: Intel Core i5-3330, AMD FX-6300 or better
GPU: Nvidia GeForce GTX 750 Ti or AMD Radeon R7 260x or better
RAM 4GB