Counter-Strike: Global Offensive

Counter-Strike: Global Offensive, a 2012 title built on the Source engine, is not usually the first game that comes to mind when discussing a flagship GPU like the NVIDIA GeForce RTX 4090. Yet, pairing it with the Intel Core i5-11400F creates a fascinating case study in bottlenecking and frame rate ceilings. The measured data reveals a combination that produces extraordinarily high frame rates, but the scaling patterns suggest the CPU is the primary architect of the performance profile, not the massive 24 GB GPU.

Resolution Scaling

The FPS drop from 1080p to 4K is surprisingly modest, which immediately signals a CPU-bound scenario. At Low settings, the system delivers 1072.9 FPS at 1080p, 872.4 FPS at 1440p, and 518.2 FPS at 4K. This represents a 19% reduction from 1080p to 1440p, but a much steeper 52% drop from 1440p to 4K. The pattern at High settings is similar: 928.6 FPS at 1080p falls to 639 FPS at 1440p (a 31% decrease), then further to 380.5 FPS at 4K (a 40% decrease from 1440p).

What this tells us is that the game engine is heavily reliant on single-threaded performance, and the i5-11400F's 6 cores and 12 threads are being pushed to their limit even at lower resolutions. The fact that 1080p High (928.6 FPS) is only 13% faster than 4K High (380.5 FPS) is striking. If the GPU were the limiting factor, the gap between 1080p and 4K would be far larger, as the render resolution would exponentially increase the pixel workload. Instead, the data suggests that at 1080p, the CPU is maxed out, and the GPU is essentially idle, waiting for draw calls. As resolution increases, the GPU finally begins to do meaningful work, but the CPU overhead remains relatively constant, which compresses the performance gap.

The Ultra preset tells a similar story but with a twist. The 4K Ultra score of 323.5 FPS is the lowest in the entire dataset, indicating that the increased graphical complexity does eventually add GPU load. However, even at this demanding setting, the frame rate is far above what any 60Hz or 144Hz display could use, showing that the combination is not struggling, merely operating in a domain where the CPU's 4.40 GHz boost clock is the governing factor.

GPU Role

The RTX 4090's role here is almost paradoxical. With 24 GB of GDDR6X memory on a 384-bit bus delivering 1.01 TB/s of bandwidth, the GPU is massively overprovisioned for a game that can run on integrated graphics. The memory clock of 1313 MHz (21 Gbps effective) and the 2520 MHz boost clock are irrelevant to the outcome because the GPU never becomes the bottleneck in most scenarios.

The benchmark results show that the GPU is barely being exercised. The PassMark G3D score of 38194 and the 3DMark Steel Nomad DX12 score of 9223 indicate a top-tier part, but in CS:GO, these compute capabilities translate to raw pixel pushing only at higher resolutions and settings. At 1080p Low, the GPU is likely rendering the scene in a fraction of a millisecond, then waiting for the CPU to submit the next frame. This is confirmed by the fact that the 4K Ultra score of 323.5 FPS is still nearly double what most systems achieve at 1080p, proving the GPU has headroom to spare.

The data implies that the RTX 4090 is a future-proofing investment for this game. If the CPU were upgraded, the GPU could likely push frame rates even higher, but the current pairing leaves the GPU utilization low. The 450 W TDP and the 850 W suggested PSU are physical realities of running this card, but in this specific game, the card is cruising, not straining.

CPU Role

The Intel Core i5-11400F is the undisputed star of this analysis. With a base clock of 2.60 GHz and a boost clock of 4.40 GHz, this Rocket Lake processor has a strong single-thread capability, which is exactly what CS:GO demands. The 3DMark single-thread score of 868 and the Cinebench R23 single-core score of 2029 are modest by today's standards, but they are sufficient to drive frame rates above 1000 in this engine.

The CPU's 6 cores and 12 threads are a double-edged sword. The game likely uses only a few threads, so the 12 MB of shared L3 cache is more important than the core count. The PassMark single-thread score of 2981 and the PassMark physics score of 842 are the relevant metrics here, as they reflect the integer and physics calculations that dominate the game's logic. The 75th percentile ranking among all CPUs shows it is a capable part, but not a top-tier processor.

The data reveals that the CPU is the limiting factor at every resolution. The difference between 1080p High (928.6 FPS) and 1080p Low (1072.9 FPS) is only 144 FPS, which is less than the difference between 4K High (380.5 FPS) and 4K Low (518.2 FPS) at 137.7 FPS. This suggests that at 1080p, the CPU is so saturated that reducing the graphics settings provides diminishing returns. The GPU is waiting, but the CPU cannot feed it any faster. The 65 W TDP demonstrates the efficiency of the architecture, but the 14 nm process node is dated, limiting the clock headroom.

How This Combo Ranks

This specific pairing of the i5-11400F and RTX 4090 holds a combo rank of 66 out of 1605 tested combinations. This places it in the top 4% of all systems, which seems impressive at first glance. However, the rank is likely inflated by the GPU's raw power, not the synergy of the components. The data shows that the GPU is being held back, so the combo rank reflects what the system can do, not what it is efficiently doing.

The individual component rankings support this interpretation. The CPU's average benchmark score of 17181 puts it in the 75th percentile, while the GPU's average score of 66473 places it in the 91st percentile. The combo rank of 66 is closer to the GPU's percentile than the CPU's, suggesting that the overall system performance is pulled up by the GPU. However, in a game like CS:GO, the CPU is the arbiter of performance, so the combo rank is misleading. A system with a stronger CPU and a weaker GPU might rank lower overall but deliver higher frame rates in this specific title.

The nearest rivals for the CPU, like the AMD Ryzen 7 5700U with a deltaPct of 0, show that the i5-11400F is not an outlier in its class. But those rivals are mobile parts, and in a desktop context, the CPU's performance is adequate, not exceptional. The GPU's nearest rivals, such as the NVIDIA Tesla T4 with a deltaPct of -0.4, are workstation cards, further highlighting that the RTX 4090 is a compute monster being used for a light esports title.

FAQ

Q: Why is the frame rate so high at 1080p Low, and why doesn't it drop much when settings are increased?

A: The CPU is the bottleneck. At 1080p, the i5-11400F is maxed out, so reducing graphics settings from High to Low only yields a 144 FPS increase, from 928.6 to 1072.9 FPS. The GPU has plenty of headroom, but it is waiting for the CPU to submit frames.

Q: Is the RTX 4090 worth it for CS:GO?

A: Based on the data, no. The GPU is never the limiting factor, even at 4K Ultra, where it still achieves 323.5 FPS. The 24 GB of VRAM and 82.58 TFLOPS of FP32 performance are irrelevant for this game, as the CPU governs the outcome.

Q: What is the best resolution for this combo?

A: 1440p is the sweet spot. The FPS at 1440p High (639 FPS) is 69% of the 1080p High score (928.6 FPS), but the visual quality improvement is significant. At 4K, the frame rates are still high, but the CPU bottleneck becomes more apparent.

Q: How does the CPU's single-thread performance affect the results?

A: The i5-11400F's boost clock of 4.40 GHz and its Cinebench R23 single-core score of 2029 are the primary drivers. CS:GO is a single-thread-heavy game, so the CPU's ability to process game logic quickly dictates the frame rate ceiling.

Q: Why is the 4K Ultra score (323.5 FPS) so much lower than 4K Low (518.2 FPS)?

A: The Ultra preset increases the graphical workload, which finally engages the GPU more. However, the CPU is still the limiting factor, so the drop is not as severe as it would be in a GPU-bound game. The 195 FPS difference shows that the GPU is doing more work, but the CPU is still holding things back.

Q: Does the combo rank reflect actual gaming performance?

A: Not accurately. The rank of 66 out of 1605 is high, but it is skewed by the GPU's raw power. In CS:GO, the CPU determines the experience, so the combo rank overstates the system's suitability for this specific title.

Settings Recommendations

For the best experience, the data suggests using the Medium preset at 1440p. This yields 739.7 FPS, which is a 16% improvement over High (639 FPS) and a 26% improvement over Ultra (549.5 FPS). The visual difference between Medium and High is often negligible in competitive shooters, and the frame rate headroom provides a safety margin for sudden scene complexity.

At 1080p, the Low preset (1072.9 FPS) is the best choice for pure competitive play, as it maximizes frame rate and minimizes input latency. However, the Medium preset (1012.6 FPS) offers nearly the same performance with better visual fidelity. The Ultra preset at 1080p (796.4 FPS) is not recommended, as it provides no competitive advantage and only serves to increase GPU load without improving the CPU-bound frame delivery.

For 4K, the High preset (380.5 FPS) is the most balanced option. The Ultra preset (323.5 FPS) drops below 350 FPS, which is still high, but the Medium preset (436.4 FPS) is a better value. The Low preset (518.2 FPS) is unnecessary, as even the High preset exceeds the refresh rate of any current gaming monitor.

Measured FPS Breakdown

At 1920x1080, the frame rates are consistently above 790 FPS across all settings. The Low preset leads with 1072.9 FPS, followed by Medium at 1012.6 FPS, High at 928.6 FPS, and Ultra at 796.4 FPS. The spread of 276.5 FPS between the lowest and highest settings demonstrates that the GPU is not the constraint.

At 2560x1440, the scores remain high but show more variation. Low produces 872.4 FPS, Medium 739.7 FPS, High 639 FPS, and Ultra 549.5 FPS. The drop from 1080p to 1440p is consistent at around 18-31%, indicating that the CPU is still the primary limiter.

At 3840x2160, the GPU begins to exert more influence. Low yields 518.2 FPS, Medium 436.4 FPS, High 380.5 FPS, and Ultra 323.5 FPS. The 4K Ultra score is the only one below 350 FPS, showing that the combination can handle even the most demanding settings in this game, albeit with the CPU still setting the pace.