Half-Life 2 is a linear first-person shooter built on the Source engine, where players guide silent protagonist Gordon Freeman through a dystopian City 17 using physics-based gravity gun puzzles, vehicular sections, and narrative-driven combat against the alien Combine. Most players experience it as a single-player campaign, often returning years later through the 20th Anniversary Update's workshop support and extensive community mods that overhaul visuals, AI behavior, particle effects, or add co-op and ray-traced lighting via RTX Remix. At 4K, the game's distinctive art direction gains remarkable new life: distant signage becomes legible, material detail on rusting metal and weathered concrete sharpens, and large-scale set pieces like the Citadel or flooded coastal chapters feel truly cinematic. This resolution matters because the base 2004 game scales gracefully but reveals its age less when every surface is rendered at native 4K. The practical load at this resolution shifts heavily toward the GPU for pixel throughput, anti-aliasing, and texture filtering. Heavy visual mods further increase VRAM usage and shader complexity, turning what was once a CPU-bound title into one that can tax modern graphics cards. Common pain points include occasional stutters from outdated engine quirks on modern multi-core CPUs during physics-heavy fights or dense AI encounters, and texture pop-in or aliasing if VRAM is insufficient for high-res packs. Before choosing a PC, understand that the priority at 4K is sustained smoothness under high visual settings rather than chasing extreme frame rates the game was never designed for; a capable system prevents the engine from feeling dated and lets mods enhance immersion instead of introducing new bottlenecks.