Counter-Strike 2

Counter-Strike 2 presents an unusual bottleneck profile when paired with the Intel Core i5-9400 and NVIDIA GeForce RTX 5090. The benchmark data shows a stark contrast between resolution scaling and settings scaling, revealing that this six-core CPU from 2018 is the primary constraint in most scenarios. At 1080p, the combo delivers 416.4 FPS on Low settings, but the scaling curve flattens dramatically as resolution increases, indicating that the GPU is far from being the limiting factor at lower resolutions.

Resolution Scaling

The FPS drop from 1080p to 4K is surprisingly modest for a flagship GPU. At High settings, the average frame rate falls from 351.6 FPS at 1920x1080 to 307.4 FPS at 2560x1440, then to 175.3 FPS at 3840x2160. That represents a 50.1% reduction from 1080p to 4K, which is far less than the typical 70-80% penalty seen with GPU-bound configurations. This compressed scaling curve is a clear indicator that the CPU is throttling performance at the lower resolutions.

The Low settings preset tells the same story with even greater clarity. At 1080p Low, the combo produces 416.4 FPS, dropping to 363.4 FPS at 1440p (a 12.7% decline) and then to 284.4 FPS at 4K (a 21.7% decline from 1440p). The fact that 4K Low still achieves 284.4 FPS—only slightly below the 1440p High result of 307.4 FPS—suggests that the RTX 5090 is barely breaking a sweat even at the highest resolution tested.

The Ultra preset exhibits the most linear scaling, with 318.6 FPS at 1080p, 246.1 FPS at 1440p, and 137.2 FPS at 4K. This steeper drop-off indicates that Ultra settings add enough GPU workload to partially shift the balance toward the graphics card, though even here the 1080p-to-4K reduction of 56.9% remains shallower than expected for a GPU of this caliber. The data strongly suggests that Counter-Strike 2's engine is not scaling with the RTX 5090's raw compute power, and the i5-9400's six threads are the ceiling.

Settings Recommendations

The measured rows reveal a clear hierarchy: Low, Medium, High, and Ultra, in that order of performance, with the gaps between presets shrinking as resolution increases. At 1080p, the spread from Low to Ultra is 97.8 FPS (416.4 down to 318.6), which is substantial. At 4K, the same spread narrows to 147.2 FPS (284.4 down to 137.2), but the relative difference grows significantly.

For competitive play, Low settings at 1080p deliver the highest frame rates at 416.4 FPS, which is the maximum measured across all configurations. The jump from Low to Medium at 1080p costs 25 FPS (from 416.4 to 391.4), while the jump from Medium to High costs another 39.8 FPS (down to 351.6). Given that Counter-Strike 2 is a fast-paced FPS where frame time consistency matters more than visual fidelity, the Low preset is the optimal choice for maximizing performance.

However, for players with 144Hz or 240Hz monitors, Medium at 1440p offers 338 FPS, which still exceeds most display refresh rates while providing improved visual clarity over Low. The Ultra preset is difficult to recommend at any resolution—even at 1080p it only reaches 318.6 FPS, which is lower than what Medium achieves at 4K (234.9 FPS is actually the only 4K result below the 1080p Ultra figure). The data indicates that High at 1440p (307.4 FPS) provides the best balance of visual quality and frame rate for most users, while 4K High (175.3 FPS) is the only 4K preset that remains above the 144Hz threshold.

FAQ

Q: Is the RTX 5090 being fully utilized in Counter-Strike 2?

A: No. The data shows only a 50.1% FPS drop from 1080p to 4K at High settings, which is far too shallow for a GPU with the RTX 5090's capabilities. The CPU is the limiting factor.

Q: What is the maximum frame rate this combo can achieve?

A: The highest measured average is 416.4 FPS at 1920x1080 with Low settings. No other configuration breaks the 400 FPS barrier, with 4K Low coming closest at 284.4 FPS.

Q: How does the i5-9400's core count affect performance?

A: The i5-9400 has 6 cores and 6 threads, with a base clock of 2.90 GHz and boost clock of 4.10 GHz. Its Cinebench R23 multi-core score of 7969 places it at the 50th percentile among all CPUs, indicating it is firmly mid-range.

Q: Should I play at 4K with this setup?

A: It depends on the preset. 4K High achieves 175.3 FPS and 4K Ultra drops to 137.2 FPS. Both are playable on high-refresh displays, but 4K Low (284.4 FPS) offers the best 4K experience for competitive play.

Q: How much performance is lost by using Ultra instead of Low?

A: At 1080p, the loss is 97.8 FPS (318.6 vs 416.4). At 1440p, the loss is 117.3 FPS (246.1 vs 363.4). At 4K, the loss is 147.2 FPS (137.2 vs 284.4), representing a 51.8% reduction.

Q: Is the i5-9400 a bottleneck for the RTX 5090?

A: Yes. The minimal FPS scaling from 1080p to 1440p at Low settings (416.4 to 363.4 FPS, a 12.7% drop) indicates the CPU is saturated before the GPU is stressed.

How This Combo Ranks

This combination ranks 261st out of 1632 tested combos in Counter-Strike 2, placing it in the top 16% of all configurations. That ranking is impressive on the surface, but it must be contextualized by the RTX 5090's enormous performance potential. The GPU alone sits at the 94th percentile among all graphics cards, with an average benchmark score of 84306. The i5-9400, by contrast, sits at the 50th percentile with an average score of 2305.

The delta between the combo's rank (261 of 1632) and the GPU's percentile (94) suggests that the CPU is dragging the overall result down significantly. If the i5-9400 were not limiting the system, the RTX 5090's raw power would likely push this combo much higher in the rankings. The nearest CPU rivals—the Intel Core i3-10305 (0.2% higher average score), Intel Core i3-1125G4 (0.2% higher), and Intel Xeon E-2134 (0.4% higher)—all perform nearly identically in synthetic benchmarks, confirming that the CPU is a mid-pack part that cannot fully feed the flagship GPU.

On the GPU side, the RTX 5090's closest competitor, the RTX 5090 D, scores 0.1% higher on average, while the RTX 5050 Mobile scores 0.2% higher. This near-tie in synthetic scores suggests the RTX 5090 is not the source of any performance discrepancy. The 261st place ranking is therefore more a reflection of the CPU's limitations than any GPU shortfall.

CPU Role

The Intel Core i5-9400 is a Coffee Lake Refresh part built on Intel's 14 nm process. It features 6 cores and 6 threads, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. The cache hierarchy consists of 64 KB L1 per core, 256 KB L2 per core, and 9 MB of shared L3 cache. The CPU supports dual-channel DDR4 memory with a bandwidth of 42.7 GB/s, and it connects to the system via PCIe Gen 3 with 16 lanes.

In Counter-Strike 2, the benchmark data indicates that the CPU's six threads are the primary constraint. The game engine appears to be heavily single-threaded or lightly threaded, as evidenced by the fact that 1080p Low (416.4 FPS) and 1440p Low (363.4 FPS) are much closer than would be expected if the GPU were the bottleneck. The 12.7% drop from 1080p to 1440p at Low settings is far smaller than the 42.9% drop seen from 1440p to 4K at High settings (307.4 to 175.3 FPS), which shows that the CPU is saturated at lower resolutions.

The i5-9400's synthetic benchmarks reinforce its mid-range status: Cinebench R23 multi-core score of 7969 and single-core score of 1125, with an average benchmark score of 2305 across all tests. The 50th percentile ranking among all CPUs means that half of all tested processors are faster, yet this combo still manages to produce 416.4 FPS at 1080p Low. That figure speaks to the RTX 5090's ability to render frames quickly once the CPU provides the data, but the CPU's six threads and 4.10 GHz boost clock are simply not enough to keep up with the GPU's potential at higher settings.

The lack of hyper-threading is notable. With only 6 threads, the i5-9400 cannot overlap game logic threads with rendering threads as efficiently as 8-thread or 12-thread CPUs. This is likely why the Ultra preset at 1080p (318.6 FPS) drops so much from the Low preset (416.4 FPS)—the additional draw calls and physics calculations required by Ultra settings load the CPU further, reducing the headroom available for frame generation. The data suggests that for this game, the i5-9400 is the definitive bottleneck, and the RTX 5090's 32 GB of GDDR7 memory and 104.8 TFLOPS of FP32 compute are largely wasted at resolutions below 4K.