Downfall

CPU Role

The Intel Core i5-10400F is a 6-core, 12-thread desktop processor built on Intel's Comet Lake architecture using a 14 nm process. It operates with a base clock of 2.90 GHz and a boost clock of 4.30 GHz, with a 65 W TDP. The CPU includes 64 KB of L1 cache per core, 256 KB of L2 per core, and 12 MB of shared L3 cache. Memory support is DDR4 over a dual-channel bus with 42.7 GB/s of bandwidth, and the chip connects via PCIe Gen 3 with 16 CPU lanes.

In Downfall, a horror title, the CPU's threading capabilities matter less than raw single-core throughput. The 3DMark single-thread score of 688 and Cinebench R23 single-core score of 1453 indicate modest per-core performance for a desktop part from 2020. However, the 12 threads provide headroom in scenes with heavy AI or physics, reflected in a Cinebench R23 multicore score of 10297 and a PassMark multithread score of 12115. The CPU's percentile ranking of 73 against all tested processors places it in the upper-middle tier, with an average benchmark score of 14168.

The measured FPS data shows that at 1080p with Low settings, the combo reaches 286.6 FPS average, which is far beyond display refresh rates for most monitors. This suggests the i5-10400F is not the limiting factor at lower resolutions in Downfall. The gap between Low and Ultra at 1080p is substantial — 286.6 FPS versus 124 FPS — indicating that graphics settings, not CPU throughput, dominate performance scaling. The 4.30 GHz boost clock is sufficient to keep frame pacing consistent in a game that relies on tension and sudden visual changes rather than complex simulation.

How This Combo Ranks

The combination of the Intel Core i5-10400F and NVIDIA GeForce RTX 3080 ranks 538 out of 1741 tested combos in Downfall, placing it in the 69th percentile of all configurations. This is a strong showing for a mid-range CPU paired with a high-end GPU. The RTX 3080's average benchmark score of 35787 puts it at the 80th percentile among all GPUs, while the CPU sits at the 73rd percentile, so the pairing is well-balanced with a slight tilt toward GPU dominance.

Looking at the CPU's nearest rivals, the i5-10400F trails the AMD Ryzen 3 7320C by 0.8% and the Intel Core i5-8500 by 1.1% in average benchmark score, while leading the AMD EPYC 7552 by 0.4%. These are narrow margins — within 1.2% either way — meaning the CPU's raw compute is comparable to several very different processors. For the GPU, the RTX 3080 sits between the AMD Radeon RX 7900 GRE (which is 0.9% faster) and the AMD Radeon Pro Duo (0.2% faster), with the NVIDIA GeForce RTX 5070 Ti Mobile 1% slower.

In Downfall specifically, the combo's rank of 538 suggests that many combinations with newer CPUs or GPUs achieve higher frame rates, but the i5-10400F + RTX 3080 still outperforms over two-thirds of tested systems. The 6-core/12-thread configuration is sufficient for this horror title, which likely does not scale beyond 8 threads given the game's 2016 release date. The data indicates that the GPU is doing most of the heavy lifting in this pairing, particularly at higher resolutions where the CPU's single-thread performance becomes less critical.

Resolution Scaling

The measured FPS data reveals clear scaling trends across resolutions. At 1080p High settings, the combo averages 198.3 FPS. Moving to 1440p High drops this to 141.3 FPS, a 28.7% reduction. At 4K High, the average falls to 90.4 FPS, which is 54.4% lower than 1080p High. This pattern shows that Downfall is heavily resolution-bound, with the GPU struggling to maintain frame rates as pixel count increases.

The Low settings tell a similar story. At 1080p Low, the system hits 286.6 FPS, which drops to 216.8 FPS at 1440p (a 24.4% decrease) and 132.2 FPS at 4K (a 53.9% decrease from 1080p). The proportional drops are nearly identical between Low and High settings, indicating that the limiting component shifts consistently with resolution rather than being affected by graphics quality. This is characteristic of a GPU-bound scenario, where the RTX 3080's 10 GB of GDDR6X memory and 760.3 GB/s bandwidth become the bottleneck at higher pixel counts.

The Ultra settings show the steepest decline. At 1080p Ultra, the average is 124 FPS; at 1440p Ultra, it falls to 89.4 FPS (28% lower); and at 4K Ultra, it drops to 58.7 FPS (52.7% lower than 1080p). The fact that the 4K Ultra result is below 60 FPS suggests that this configuration is not ideal for maximum quality at 4K in Downfall, but it remains playable. The RTX 3080's 320 W TDP and dual-slot design are clearly being exercised at these settings, with the GPU's 29.77 TFLOPS FP32 performance providing the raw compute headroom.

The scaling pattern — roughly a 25% drop from 1080p to 1440p and another 35-38% drop from 1440p to 4K — indicates that the CPU keeps up fine even at 1080p Low where frame rates exceed 280 FPS. If the i5-10400F were a bottleneck, we would expect to see diminishing returns at lower resolutions, but the consistent proportional drops across all settings point to the GPU as the primary constraint.

FAQ

Q: Does the Intel Core i5-10400F bottleneck the RTX 3080 in Downfall?

A: No. The data shows frame rates scale consistently with resolution — a 54% drop from 1080p to 4K at High settings — which indicates GPU-bound performance. The CPU's 6 cores and 12 threads with a 4.30 GHz boost clock are sufficient to feed the GPU even at 286.6 FPS at 1080p Low.

Q: What is the best resolution and settings combination for this system?

A: At 1440p High, the combo averages 141.3 FPS, which is smooth for most displays. At 4K High, it drops to 90.4 FPS, still playable. For 4K Ultra, the average is 58.7 FPS, which is below the 60 FPS threshold but usable for a horror game where frame pacing is less critical.

Q: How does the RTX 3080 compare to its nearest rival GPUs?

A: The RTX 3080's average benchmark score of 35787 is 0.2% lower than the AMD Radeon Pro Duo, 0.4% higher than the AMD Radeon 880M, and 0.9% lower than the AMD Radeon RX 7900 GRE. The NVIDIA GeForce RTX 5070 Ti Mobile is 1% slower.

Q: Is the i5-10400F competitive with other CPUs in its class?

A: The CPU's average benchmark score of 14168 places it within 1.2% of four rivals. It is 0.4% faster than the AMD EPYC 7552, 0.8% slower than the AMD Ryzen 3 7320C, 1.1% slower than the Intel Core i5-8500, and 1.2% slower than the AMD Ryzen Embedded V2546.

Q: Why does the FPS drop more from 1440p to 4K than from 1080p to 1440p?

A: The pixel count increase is larger going from 1440p to 4K (2.25x) than from 1080p to 1440p (1.78x). The data shows a 35-38% FPS drop for the former versus a 24-29% drop for the latter, consistent with the GPU's memory bandwidth of 760.3 GB/s being saturated at higher resolutions.

Q: What is the 4K Low setting performance?

A: At 4K with Low settings, the combo averages 132.2 FPS. This is higher than the 4K High result of 90.4 FPS, showing that reducing graphics quality can nearly double frame rates at 4K when the GPU's 10 GB VRAM is the limiting factor.

GPU Role

The NVIDIA GeForce RTX 3080 is built on the Ampere architecture using Samsung's 8 nm process, with a GA102 chip containing 28,300 million transistors on a 628 mm² die. It features 8704 shading units, 272 TMUs, and 96 ROPs, along with 68 RT cores and 272 tensor cores. The GPU operates at a base clock of 1440 MHz and boosts to 1710 MHz, with memory clocked at 1188 MHz effective 19 Gbps. The 10 GB of GDDR6X memory runs on a 320-bit bus, delivering 760.3 GB/s of bandwidth.

In Downfall, the GPU's role is dominant based on resolution scaling analysis. The pixel rate of 164.2 GPixel/s and texture rate of 465.1 GTexel/s provide the fill rate needed for the game's dark, atmospheric environments. The RTX 3080's FP32 performance of 29.77 TFLOPS enables high frame rates even at 4K Ultra (58.7 FPS), though the data shows this is the weakest result across all tested settings.

The GPU's 80th percentile ranking among all GPUs, with an average benchmark score of 35787, places it ahead of most competing graphics cards. Its nearest rivals in average score — the AMD Radeon Pro Duo at 35860, AMD Radeon RX 7900 GRE at 36101, and AMD Radeon 880M at 35646 — are all within 1% of the RTX 3080's score. This indicates that the RTX 3080 remains competitive despite being end-of-life, with a successor in the GeForce 40 series already established.

The VRAM configuration of 10 GB is sufficient for Downfall at all tested settings, as frame rates remain consistent across resolution scaling without abrupt drops that would indicate memory swapping. The bandwidth of 760.3 GB/s is the key enabler for 4K performance, where the GPU's memory subsystem is heavily taxed. The PassMark G3D score of 25086 and 3DMark Steel Nomad DX12 score of 4407 further confirm the GPU's strong compute capabilities for this horror title's visual effects.