Minimum System Requirements
Windows
OS:
Windows XP SP2 Processor:
Intel Core 2 Duo E6600 or AMD Phenom X3 8750 RAM:
2 GB RAM Video card:
256 MB VRAM, NVIDIA GeForce 8600GT or ATI Radeon HD 3450 Sound card:
DirectX Compatible Disk space:
7 GB available space 
MAC
Rock Band 3 is not officially supported on macOS. However, some users have managed to run the game using Windows emulation software or by installing Windows on a separate partition via Boot Camp
Linux
Rock Band 3 does not have an official Linux version. Players have used compatibility layers like Steam Play's Proton or Wine to run the game on Linux systems, but performance and compatibility can vary
Recommended System Requirements
Windows
OS:
Windows 7 Processor:
Intel Core 2 Quad Q6600 or AMD Phenom II X4 940 RAM:
4 GB RAM Video card:
512 MB VRAM, NVIDIA GeForce 8800GT or ATI Radeon HD 4850 Sound card:
DirectX Compatible Disk space:
7 GB available space MAC
Rock Band 3 is not officially supported on macOS. However, some users have managed to run the game using Windows emulation software or by installing Windows on a separate partition via Boot Camp
Linux
Rock Band 3 does not have an official Linux version. Players have used compatibility layers like Steam Play's Proton or Wine to run the game on Linux systems, but performance and compatibility can vary
We recommend playing Rock Band 3 on a Windows PC that meets or exceeds the recommended system requirements. If you're trying to play on a Mac or Linux, be prepared for potential technical issues and performance changes.
