The Steam Deck (RDNA2 iGPU) is a handheld card with 4GB of VRAM, and Subnautica 2 is a moderately demanding game. Paired with a balanced Intel Core i5-8600K-class CPU it averages about 61 FPS at 1080p with FrameCoach's tuned settings — up from roughly 28 FPS with everything on High.
| Resolution | All-High FPS | Optimized FPS |
|---|---|---|
| 1080p | 28 | 61 |
| 1440p | 17 | 46 |
| 4K | 10 | 26 |
At 1080p expect around 61 FPS, at 1440p about 46 FPS, and at 4K roughly 26 FPS with optimized settings. The single biggest improvement is FSR upscaling — set it to Quality.
🎛 See the full best-settings guide for Subnautica 2 on the Steam Deck (RDNA2 iGPU) →
⚡ Check your exact CPU & target FPS in the optimizer →
Yes. With FrameCoach's optimized balanced settings, the Steam Deck (RDNA2 iGPU) averages about 61 FPS at 1080p in Subnautica 2.
Around 61 FPS at 1080p with optimized settings (up from about 28 FPS on all-High).
Turn on FSR (Balanced) for the biggest free boost, keep ray tracing off, and lower the heaviest settings a notch. FrameCoach's full per-setting guide for this exact combo shows what each option costs.
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.