On a Steam Deck (RDNA2 iGPU) (paired with a balanced Intel Core i5-8600K-class CPU), Marathon runs at roughly 57 FPS at 1080p with our optimized settings — up from about 25FPS with everything maxed. Here's the configuration and what each setting costs.
The Steam Deck (RDNA2 iGPU) is a handheld graphics card with 4GB of VRAM, and Marathon is a demanding, graphically heavy game. Paired with the Intel Core i5-8600K, it is playable at 1080p — about 57 FPSwith FrameCoach's optimized settings, a clear jump from roughly 25 FPS with everything on High.
Across resolutions you can expect around 57 FPS at 1080p and 34 FPS at 1440p, dropping to roughly 20 FPS at 4K. With only 4GB of VRAM, keep textures a notch below max in Marathon at higher resolutions to avoid stutter. The biggest free win is FSR upscaling — set it to Quality for a large FPS boost at little visual cost.
| Resolution | All-High FPS | Optimized FPS |
|---|---|---|
| 1080p | 25 | 57 |
| 1440p | 15 | 34 |
| 4K | 8 | 20 |
⚡ Fine-tune this for your exact CPU & target FPS →
With FrameCoach's optimized balanced settings, the Steam Deck (RDNA2 iGPU) averages around 57 FPS at 1080p in Marathon — up from about 25 FPS with everything on High.
At 1440p with optimized settings, the Steam Deck (RDNA2 iGPU) averages roughly 34 FPS in Marathon; turn on upscaling or aim for a locked 60 for the best feel.
Turn on FSR (Balanced), keep ray tracing off for maximum FPS, and ease the heaviest options like Shadow Quality and View Distance down a notch. The full per-setting breakdown is above.
FPS figures are estimates from a generalized model (hardware tier × game load × per-setting weights), not live benchmarks — real performance varies by scene, drivers and game version.