Official specs from Steam

Saints Row: The Third system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native Linux build available.

Minimum

OS *Windows® XP
Processor2GHz Dual Core Processor (Intel® Core 2 Duo or AMD Athlon™ X2) or higher
Memory2GB System RAM or more
Graphics320MB Video RAM GPU w/ Shader Model 3.0 support. NVIDIA® GeForce® 8800 series or better. ATI Radeon™ HD3800 series or better
DirectX®9.0c
Hard Drive10GB
Sound100% DirectX® 9.0C compliant sound card or equivalent onboard sound
Co-Op PlayNVIDIA® GeForce® 8800 cards require 640MB of Video RAM. ATI Radeon™ HD3800 cards require 1GB of Video RAM

Recommended

OS *Microsoft® Windows® 7
ProcessorAny Quad Core Processor (Intel® Core i5 or AMD Phenom™ II X4) or 3.0+ Dual Core CPU
Memory4GB System RAM or more
Graphics1GB Video RAM GPU w/ Shader Model 4.0 support. NVIDIA® GeForce® GTX 400 series or better. ATI Radeon™ HD5000 series or better
DirectX®DirectX® 11
Hard Drive10 GB
Sound100% DirectX® 9.0C compliant sound card or equivalent onboard sound

FAQ

What graphics card do I need for Saints Row: The Third?

Minimum: 320MB Video RAM GPU w/ Shader Model 3.0 support. NVIDIA® GeForce® 8800 series or better. ATI Radeon™ HD3800 series or better. Recommended: 1GB Video RAM GPU w/ Shader Model 4.0 support. NVIDIA® GeForce® GTX 400 series or better. ATI Radeon™ HD5000 series or better.

How much RAM does Saints Row: The Third need?

Saints Row: The Third needs 2GB System RAM or more at minimum, 4GB System RAM or more recommended.

How big is Saints Row: The Third?

Saints Row: The Third requires 10GB.

Does Saints Row: The Third run on Mac or Steam Deck/Linux?

There is no native macOS version. A native Linux build is available.