Doom

The AMD Radeon RX 6750 XT paired with the Intel Core i5-12400F delivers a powerful 1080p and 1440p experience in Doom, with performance scaling that clearly identifies the GPU as the primary constraint at higher resolutions. The data shows a combo that is highly capable of pushing high refresh rates at mainstream resolutions, while 4K remains a playable but more demanding scenario where settings must be managed carefully.

Resolution Scaling

The measured FPS data reveals a consistent and predictable performance degradation as resolution increases from 1920x1080 to 3840x2160. At High settings, the average frame rate drops from 174.6 FPS at 1080p to 115.2 FPS at 1440p, a reduction of approximately 34%. Moving further to 4K, the average falls to 64 FPS, representing a further 44% decrease from the 1440p result. This pattern strongly indicates that the GPU is the limiting component, as the CPU’s workload does not scale proportionally with pixel count.

The scaling behavior is even more pronounced at Ultra settings. The average FPS at 1080p is 143.1, which drops to 91.5 at 1440p (a 36% decrease) and then to 52.4 at 4K (a 43% decrease from 1440p). This consistent percentage drop across the resolution spectrum is a classic signature of a GPU-bound scenario. The i5-12400F, with its six cores and twelve threads, provides sufficient headroom to feed the GPU at all tested resolutions, meaning the frame rate ceiling is set by the Radeon RX 6750 XT’s rendering throughput.

The difference between Low and Ultra settings also widens with resolution. At 1080p, the gap between Low (239.2 FPS) and Ultra (143.1 FPS) is 96.1 FPS. At 4K, the same settings gap narrows to 30.6 FPS (83 FPS Low vs 52.4 FPS Ultra). This compression of the settings gap at higher resolutions further confirms that pixel fill rate and memory bandwidth become the dominant factors, overshadowing the shader compute demands that differentiate settings at lower resolutions.

GPU Role

The Radeon RX 6750 XT is built on the RDNA 2.0 architecture and features 12 GB of GDDR6 memory on a 192-bit bus, yielding a bandwidth of 432.0 GB/s. The card’s boost clock is listed at 2600 MHz, with a game clock of 2495 MHz. The large memory pool and substantial bandwidth are critical for the high-resolution performance observed, particularly at 4K where the frame buffer demands are significantly higher.

The GPU’s raw compute capabilities, with 2560 shading units and a FP32 throughput of 13.31 TFLOPS, are well-suited to Doom’s engine. The data shows that at 1080p Ultra, the card achieves 143.1 FPS, which is a strong result but not maxing out the potential of the CPU. This suggests the card’s shading units are being fully utilized, but the frame rate is not constrained by the CPU. The GPU’s 40 ray accelerators, while not specifically stressed in this title, are part of the feature set. The card’s 64 ROPs and pixel rate of 166.4 GPixel/s are directly relevant to the 4K results, where the fill rate becomes a bottleneck, explaining the drop to 64 FPS at High settings.

The benchmark scores for the GPU place it in the 79th percentile of all GPUs, and its average benchmark score of 35327 is nearly identical to that of the NVIDIA GeForce RTX 3080, which has a deltaPct of -1.3. This indicates the RX 6750 XT is a high-performing part, capable of competing with much more expensive hardware in synthetic tests. In Doom specifically, the measured results show that the card’s performance is consistent with its percentile ranking, delivering smooth frame rates at 1440p and playable, though not maximal, performance at 4K.

CPU Role

The Intel Core i5-12400F is a six-core, twelve-thread processor from the Alder Lake-S family. Its base clock is 2.50 GHz, boosting up to 4.40 GHz. With a 65 W TDP, it is an efficient part, but its role in this gaming scenario is to provide a stable platform for the GPU. The CPU’s single-thread performance, as indicated by a 3dmark_single_thread score of 909, is crucial for game logic and draw call submission. The multi-threaded capabilities, shown by a cinebench_r23_multicore score of 16518, ensure that background tasks and the game’s heavier threads do not cause stuttering.

The benchmark data shows that the i5-12400F achieves a high level of performance, with an average benchmark score of 19221, placing it in the 77th percentile of all CPUs. Its nearest rival, the Intel Core i7-8700K, has a deltaPct of 0.1, meaning the i5-12400F is essentially tied with a previous-generation flagship in overall CPU benchmarks. This parity is significant because it shows the modern i5 provides enough computational power to avoid bottlenecking a high-end GPU like the RX 6750 XT.

In Doom, the CPU’s influence is most visible at 1080p with Low settings, where the average FPS reaches 239.2. This high frame rate is near the practical limit for many displays and demonstrates that the CPU can process frames quickly enough to keep the GPU saturated. However, the fact that the FPS does not exceed 240 FPS suggests that even at this low resolution and settings, the CPU is beginning to become a more significant factor, though it does not limit the experience at more demanding settings. The CPU’s 18 MB of shared L3 cache and dual-channel memory support are adequate to maintain high throughput for this game’s data streams.

Measured FPS Breakdown

At 1920x1080, the combo excels across all settings. Low settings yield an average of 239.2 FPS, Medium 209.6 FPS, High 174.6 FPS, and Ultra 143.1 FPS. The progression is smooth, with a 96 FPS difference between Low and Ultra, indicating that the GPU has ample headroom to handle increased graphical fidelity. All results are well above 100 FPS, making this an excellent setup for high-refresh-rate 1080p monitors.

Moving to 2560x1440, the performance remains strong. The average FPS at Low is 153.7, Medium 135.9, High 115.2, and Ultra 91.5. The drop from 1080p is significant, but the experience is still very smooth. At Ultra settings, the 91.5 FPS average is just below the 100 FPS mark, but it remains highly playable. The 1440p High result of 115.2 FPS is a sweet spot, offering a balance of visual quality and frame rate.

At 3840x2160, the GPU’s limits are clearly reached. The average FPS at Low is 83, Medium 76.3, High 64, and Ultra 52.4. While all these results are technically playable, the Ultra setting at 52.4 FPS is below the 60 FPS target that many users prefer for fast-paced action. The High setting at 64 FPS is the recommended choice for 4K, providing a more stable frame rate. The data shows that this combo is capable of 4K gaming, but users must be willing to compromise on settings to maintain a smooth experience.

How This Combo Ranks

The combination of the Intel Core i5-12400F and AMD Radeon RX 6750 XT ranks 866th out of 1681 tested combos in Doom. This places it in the upper-middle portion of the database, which is a strong result given the hardware’s price point and specifications. The rank reflects a balanced pairing where neither component is a clear bottleneck at common gaming resolutions.

The GPU’s individual performance, being in the 79th percentile, is a key driver of this ranking. Its synthetic benchmark score is nearly identical to the RTX 3080, which is a much more expensive card. However, the combo’s rank is not higher because the CPU, while strong, is not top-tier. The i5-12400F’s 77th percentile ranking is good, but it does not match the GPU’s relative standing. This slight mismatch means that in some CPU-light scenarios, the GPU could potentially perform slightly better with a faster processor, but in Doom, the balance is effective.

The measured FPS data supports this ranking. The combo achieves over 140 FPS at 1080p Ultra and over 90 FPS at 1440p Ultra, which are excellent results for a mid-range system. The fact that it maintains 64 FPS at 4K High reflects the GPU’s memory bandwidth and the efficiency of the game’s engine. The rank of 866 out of 1681 shows that while many higher-end combos exist, this particular pairing offers a compelling level of performance that is well above the median. The data suggests that for a user targeting high-refresh-rate 1440p gaming, this combination is exceptionally well-matched.