PC requirements

Only If System Requirements

Only If needs at least Dual Core CPU @ 2.2 GHz, 2 GB RAM and Nvidia GeForce 8800 GT / ATI Radeon HD 4770 graphics. For the recommended experience you want Dual Core CPU @ 2.4 GHz, 3 GB RAM and Nvidia GeForce GTX 280 / ATI Radeon HD 5830 graphics.

Verified Sources: Steam store listing
Only If minimum and recommended PC specifications
Component Minimum Recommended
Operating system Windows XP (SP2 or higher), Vista, 7, or 8 Windows 7 or 8
Processor Dual Core CPU @ 2.2 GHz Dual Core CPU @ 2.4 GHz
Memory 2 GB RAM 3 GB RAM
Graphics Nvidia GeForce 8800 GT / ATI Radeon HD 4770 Nvidia GeForce GTX 280 / ATI Radeon HD 5830
DirectX Version 9.0c —
Storage 1 GB available space 2 GB available space
Additional notes DirectX 9.0c compatible DirectX 9.0c compatible
Not sure how your PC compares? Use the Can I Run It checker — pick your CPU and GPU and it tells you which column you land in.

Other platforms

Only If is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Only If on PC

Can my PC run Only If?
Compare your CPU, GPU and RAM against the minimum column below. If your parts match or beat every minimum row, the game will launch — though you may need to lower settings. Matching the recommended column is what gets you 60fps at 1080p.
How much storage does Only If need?
1 GB available space
What is the difference between minimum and recommended specs?
Minimum means the game starts and is playable, usually at 30fps on low settings at 1080p. Recommended is the developer's target for a smooth 60fps experience at high settings.