256 out of the gate, then with the first major expansion it jumped to 1GB, then the second major expansion, in 2016 2GB. Now, who knows what of that, if much at all, comes from graphics bumps, however.
Burning Crusade was still 512mb
PC System Requirements
* OS: Windows 2000 (Service Pack 4); Windows XP (Service Pack 2)
* Processor: Intel Pentium3 800MHz or AMD Duron 800MHz
* Memory:
o 512 MB RAM,
o 1GB RAM is recommended
* Video:
o Minimum: 32MB 3D graphics processor with Hardware Transform and Lighting, such as an NVIDIA GeForce 2 class card or above.
o Recommended: 64MB VRAM 3D graphics processor with Vertex and Pixel Shader capability, such as an NVIDIA GeForce FX 5700 class card or above.
WoTLK basically the same
PC:
- Windows XP SP3 or Vista SP1 (Windows 2000 no longer supported)
- Pentium 4 1.3 GHz or AMD Athlon XP 1.5 GHz. Dual-core recommended.
- RAM: 512 MB/1 GB for Vista, 1 GB/2 GB recommended.
- Video: GPU with hardware transform and lighting and 32 MB VRAM, Recommended 128 MB VRAM.
Cataclysm requires 1GB of RAM
Windows XP 32bit (SP3), Windows XP 64bit (SP2), Windows Vista 32bit (SP1), Windows Vista 64bit (SP1):
- Intel Pentium 4 1.3 GHz or AMD Athlon XP 1500
- 1GB or more of RAM
- NVIDIA® GeForce® FX or ATI Radeon™ 9500 video card or better
- DirectX-compatible sound card or motherboard sound capability
- 25 GB free hard drive space
Pandora requires 2GB for anything above Windows XP and a dual core
Minimum System Requirements
Operating System Windows XP/Vista/7 with latest service pack Mac OS X 10.7.3
CPU Intel Pentium D or AMD Athlon 64 X2 Intel Core 2 Duo
Video NVIDIA GeForce 6800 NVIDIA GeForce 8600M GT
Memory 2 GB RAM (1 GB Windows XP)
Storage 25 GB available hard drive space
WoD requires an additional 10GB of HDD and 2GB for all OS plus a good leap in CPU and GPU
Minimum System Requirements
PC/Mac:
- 35 GB available HD space
- 2 GB RAM
- Broadband Internet connection
- Keyboard/mouse
- DVD-ROM drive
- 1024×768 minimum display resolution
PC:
- Windows XP/Windows Vista/Windows7/Windows8 (latest Service Pack)
- Intel Core2 Duo E6600 or AMD Phenom X3 8750
- NVIDIA GeForce 8800 GT, ATI Radeon HD 4850 or Intel HD Graphics 3000
And finally Legion with another increase to HDD by 20GB
MINIMUM REQUIREMENTS
- Operating System: Windows® XP / Windows Vista® / Windows® 7 / Windows® 8 / Windows® 10 with latest service pack
- Processor: Intel® Core™ 2 Duo E8500 or AMD Phenom™ II X3 720
- Video: NVIDIA® GeForce® GT 440
- Memory: 2 GB RAM
- Storage: 45 GB available hard drive space
- Internet: Broadband internet connection
- Media: DVD-ROM drive
- Input: Keyboard and mouse required. Other input devices are not supported.
- Resolution: 1024 x 768 minimum display resolution