PC requirements

Serious Sam Double D XXL System Requirements

Serious Sam Double D XXL needs at least 2.0 GHz or faster (Dual-core recommended), 1GB of RAM and 128 MB Card, supports Shader Model 2.0 graphics.

Verified Sources: Steam store listing
Serious Sam Double D XXL minimum and recommended PC specifications
Component Minimum
Operating system XP, Vista, 7
Processor 2.0 GHz or faster (Dual-core recommended)
Memory 1GB
Graphics 128 MB Card, supports Shader Model 2.0
Storage 500MB
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

Serious Sam Double D XXL is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Serious Sam Double D XXL on PC

Can my PC run Serious Sam Double D XXL?
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 Serious Sam Double D XXL need?
500MB