The RTX 5090 is the fastest consumer GPU available, so the real question for Sons of the Forest is not whether it runs, but how far past your monitor's refresh rate it goes at 1080p.
Quick Answer
The RTX 5090 runs Sons of the Forest at 1080p maxed fully CPU-limited, often above 200 fps. At 1080p the card is heavily underused; the dense foliage and co-op make 4K the resolution that justifies it.
Why 1080p Underuses The Card
Sons of the Forest is demanding thanks to dense foliage, but at 1080p the RTX 5090 renders frames faster than the CPU can feed them, landing above 200 fps maxed with a strong chip. The GPU sits well below its limit, so 1080p does not reflect the card's strength in this title.
Settings And Co-Op
Max every setting at 1080p; the RTX 5090 has the headroom, and DLSS is unnecessary at this resolution. Note that co-op adds CPU load, which matters more at 1080p where you are CPU-bound. For proper use of the card, move to 4K, where the dense forests actually stress the GPU.
RTX 5090 In SA
The RTX 5090 is currently stocked at Evetech in the R55,000-R65,000 band depending on model. For Sons of the Forest at 1080p it is overkill; it makes sense at 4K or alongside other demanding current titles. Pair it with a Ryzen 7 9800X3D to push the CPU-limited 1080p frame rate higher.
FAQ
What FPS does the RTX 5090 get in Sons of the Forest at 1080p?
Above 200 fps maxed, fully CPU-limited. The dense foliage stresses the GPU more at higher resolutions, not at 1080p.
Does co-op affect performance?
Yes. Co-op adds CPU load, which matters most at 1080p where you are already CPU-bound. A fast CPU keeps frame times steady.
Should I run Sons of the Forest at a higher resolution on a 5090?
Yes. At 4K the dense forests finally stress the GPU, making proper use of the RTX 5090's power rather than wasting it at 1080p.
in Sons of the Forest you are CPU-limited; run the RTX 5090 at 4K, where the dense foliage finally uses the GPU's power.
