Two CPUs, One Resolution, Zero Margin for Error
At 4K, the GPU does the heavy lifting – but the CPU still shapes the result. AMD’s Ryzen 7 9800X3D and Intel’s Core Ultra 7 265K sit at the top of the mainstream desktop market, and how they perform at 4K rasterization tells you something important about where each processor actually earns its price tag.
The Setup and What We Are Actually Testing
The test configuration paired both processors with an RTX 4090 to minimize GPU bottlenecking as much as possible. Memory was standardized at DDR5-6000 with matching timings across both platforms – AM5 for the 9800X3D running at stock with Precision Boost Overdrive enabled, and LGA1851 for the 265K running without an active power limit. Thermal solutions were identical. The goal was to isolate CPU contribution at 4K, which is harder to do cleanly than it sounds, because even at this resolution, certain game engines still feed data to the CPU faster than the GPU can consume it.
The game selection covered a range of rendering workloads: Cyberpunk 2077 with path tracing disabled, Hogwarts Legacy, Avatar: Frontiers of Pandora, The Last of Us Part I on PC, Assassin’s Creed Mirage, and Star Wars Jedi: Survivor. These titles span Unreal Engine 5, proprietary engines, and aging but demanding ports – a realistic cross-section of what a high-end gaming PC runs in 2024 and into 2025. Frame time consistency was tracked alongside raw framerate, because at 4K on a high-refresh display, stutters show up in ways that average FPS figures obscure.
The 9800X3D carries AMD’s 3D V-Cache technology, which stacks an additional 64MB of L3 cache on top of the existing cache pool for a combined 96MB. That matters most in cache-sensitive workloads where CPU threads are feeding the GPU draw calls, geometry data, or physics results. The 265K counters with higher base and boost clocks, a wider thread count at 24 cores (8 P-cores, 16 E-cores), and Intel’s Thread Director handling task scheduling. At 1080p and 1440p, those architectural differences produce clear winners depending on the game. At 4K, the margin narrows considerably – but it does not disappear.
One practical note before the numbers: at 4K on an RTX 4090, most titles are already delivering framerates well above what most monitors can display. The differentiation between these two CPUs is therefore most visible in frame time variance, 1% lows, and titles that remain even partially CPU-limited at ultra settings. Raw average FPS is included, but it is the consistency data that makes the case for one chip over the other.
Game by Game: Where Each CPU Wins and Why
Cyberpunk 2077 without path tracing at 4K ultra settings is largely GPU-bound, and both CPUs deliver nearly identical average framerates within a margin of error. The 9800X3D holds a slight edge in 1% lows – roughly 3 to 5 percent better – which points to its larger L3 cache smoothing over the draw call overhead that CD Projekt Red’s engine generates at high world detail. It is not a dramatic lead, but frame time graphs show the 9800X3D producing a flatter curve through dense urban areas like the Night City market districts. The 265K is not slow here, just slightly more variable under sustained GPU pressure.
Hogwarts Legacy on Unreal Engine 4 tells a different story. This game has well-documented CPU overhead in its open-world traversal sections, and at 4K it remains one of the few titles where CPU performance still visibly matters even at maximum resolution. The 9800X3D outperforms the 265K by around 8 to 12 percent in average framerate through Hogsmeade, and the 1% low advantage stretches further – nearly 15 percent in the most demanding sections. Hogwarts Legacy essentially rewards cache density, and the 9800X3D delivers exactly that.
Avatar: Frontiers of Pandora and The Last of Us Part I both lean heavily on multi-threaded workloads. Avatar uses a heavily modified Snowdrop engine that distributes workloads across available threads aggressively, and here the 265K’s 24-core configuration starts to show relevance. Average framerates at 4K favor the 265K by a small margin – 2 to 4 percent – but 1% lows are nearly tied. The Last of Us Part I, which has a history of being CPU-demanding on PC, splits the difference almost exactly. Neither chip offers a meaningful advantage in that title at 4K ultra settings, which itself is a useful data point: when a game is genuinely balanced in threading demands, the cache advantage of the 9800X3D and the core advantage of the 265K cancel out.
Assassin’s Creed Mirage is worth noting specifically because it is an older, lighter engine that still exposes CPU behavior clearly. At 4K, both chips are effectively identical in average FPS. Frame times are clean on both platforms, and the result confirms that when a game is comfortably GPU-limited at this resolution, processor choice becomes irrelevant to the experience. Star Wars Jedi: Survivor behaves similarly in most areas, though its more demanding combat sections do show the 9800X3D’s 1% lows pulling slightly ahead during particle-heavy enemy encounters.
Across the full game set, the 9800X3D wins on 1% lows in four of six titles, loses on average FPS in one (Avatar), and ties in one (TLOU Part I). The 265K never produces a bad result – it is a fast, capable processor – but the 9800X3D’s cache architecture keeps delivering small, consistent gains in the metric that most affects perceived smoothness. For those also running ray tracing workloads, the comparison shifts in some areas, but rasterization at 4K is still where most games are actually played.
Power, Heat, and What the Platform Costs You
The 9800X3D runs cooler and draws less power under gaming loads – that is not a new observation, but at 4K it is reinforced by the fact that the chip rarely boosts to its thermal ceiling because the workload is already GPU-limited enough to keep CPU threads from running at full tilt continuously. Package power during gaming hovers below 70W in most titles. The 265K, with no power limit, regularly reaches 150W to 175W in gaming workloads, requiring a more substantial cooling solution and a higher-tier motherboard to run without throttling. Neither chip runs hot enough to cause problems with appropriate cooling, but the platform cost difference is real.
AM5 boards at the mid-to-high tier are broadly cheaper than Z890 boards capable of handling the 265K without compromise. DDR5 pricing has equalized enough that memory is no longer a differentiator. Where Intel’s platform still holds an argument is future-proofing through Thunderbolt 4 native support and PCIe 5.0 lane availability, depending on motherboard selection. AMD’s AM5 socket is also confirmed to support future CPU generations, which complicates any clean verdict on long-term value. The 9800X3D costs slightly more than the 265K at current street pricing, which means AMD asks you to pay a premium for the cache advantage and the lower power draw simultaneously.
The Verdict in Practice
For pure 4K rasterization gaming, the Ryzen 7 9800X3D is the stronger choice – not because it wins every benchmark, but because the wins it does collect are in frame time consistency rather than average FPS, and that is exactly what 4K gaming on a high-refresh display actually demands. The 265K is a serious processor and it competes well in multi-threaded and lightly-cached workloads, but it does not dethrone the 9800X3D in the use case this comparison specifically tests.
The harder question is whether 4K rasterization is still the right benchmark to optimize for heading into 2025. Path tracing adoption is growing, upscaling through DLSS 4 and FSR 4 is changing how native resolution performance is evaluated, and a growing number of demanding titles are structured around frame generation pipelines that shift CPU timing requirements entirely. The 9800X3D wins at 4K rasterization – but the next generation of workloads may not reward cache in exactly the same way, and Intel’s higher thread count could start to matter more as engines continue to evolve.
