Fallout 4 is a single-player open-world RPG set in a post-apocalyptic Commonwealth full of exploration, faction quests, settlement building, crafting, and real-time or V.A.T.S. combat. On PC, most players spend dozens or hundreds of hours modding the 2015 title with graphical overhauls, ENBs, high-resolution textures, NPC enhancements, and performance patches that keep the aging Creation Engine feeling fresh. These mods dramatically increase visual quality but also raise hardware demands far beyond the original console release. At 4K, the scenario matters because every surface, volumetric light ray, shadow cascade, and distant landmark is rendered with four times the pixels of 1080p, making atmospheric immersion far more convincing while exposing any weakness in VRAM capacity or texture streaming. Dense settlements and crowded city ruins create heavy draw-call and AI loads that can cause stuttering if the CPU cannot keep up, and physics tied to frame rate can behave strangely without proper hardware balance. Mod stacks that include grass density increases, godrays, and reflections further tax both GPU and CPU, turning what might run smoothly at lower resolutions into a demanding experience. Common pain points at 4K include long loading times when streaming large modded asset packs, hitching when entering built-up player settlements, and occasional crashes from VRAM exhaustion on cards with less than 12–16 GB. Many builders mistakenly focus only on GPU power and end up with a system that still stutters because the processor lacks the single- and multi-thread performance needed for the game’s scripting and NPC management. Before choosing a PC for 4K Fallout 4, understand that the goal is balanced hardware that prioritizes both raw pixel-pushing power and stability across long immersive sessions rather than chasing maximum frame rates.