Fallout: New Vegas is a 2010 open-world Action RPG set in the post-apocalyptic Mojave Desert. Players explore vast areas, complete branching faction-based quests, manage reputation, and engage in real-time or V.A.T.S. combat while recruiting companions. Most current players run the game through stability-focused modding guides like Viva New Vegas, layering on texture overhauls, ENBs, improved lighting, and quality-of-life fixes that greatly increase visual fidelity and asset density. At 4K, the scenario is aimed at enthusiasts who want to push visual quality far beyond the base game's dated look. High-resolution texture packs and advanced shaders create crisp distant terrain and detailed environments, but they also amplify the engine's weaknesses. The Gamebryo engine is primarily CPU-sensitive due to poor multi-threading, so crowded locations like the New Vegas Strip or areas with high NPC and script activity produce stuttering and low CPU utilization on modern hardware. GPU load remains relatively low even at 4K, yet enough VRAM is required to prevent hitches when streaming large modded assets during cell transitions. Common pain points include random crashes, micro-stutter during exploration, and long loading times when using heavy texture mods without fast storage. Many builders mistakenly pour money into high-end GPUs assuming the old engine will scale like a modern title, but this overlooks the single-threaded CPU dependency and need for rock-solid stability. Before choosing parts, understand that a sensible 4K New Vegas PC must emphasize consistent frame pacing and crash resistance through thoughtful component balance rather than maximum raw horsepower.