Counter-Strike: Global Offensive

Counter-Strike: Global Offensive is an esports title where frame rates are king, and this pairing of an Intel Core i5-9400 with an NVIDIA GeForce RTX 5080 delivers a staggering amount of headroom across all tested resolutions. The data shows a system that is overwhelmingly GPU-limited at 4K but becomes increasingly CPU-bound as resolution drops, a classic dynamic for a modern graphics card paired with an older six-core processor.

Resolution Scaling

The measured frame rates reveal a predictable yet pronounced scaling pattern as resolution increases. At 1920x1080 with High settings, the combo produces an average of 783 FPS. Moving to 2560x1440 High, the average drops to 600 FPS, a 23% reduction. The jump to 3840x2160 High yields an average of 354 FPS, which is a 41% decrease from the 1440p figure and a 55% decrease from the 1080p result. This steep decline indicates that the RTX 5080's rendering workload is scaling heavily with pixel count, which is expected given the GPU's massive FP32 throughput of 56.28 TFLOPS.

The gap between Low and Ultra settings widens dramatically at higher resolutions. At 1080p, the spread from Low (872 FPS) to Ultra (741 FPS) is 131 FPS, or roughly 15%. At 1440p, that spread grows to 258 FPS, from 770 FPS on Low to 512 FPS on Ultra. At 4K, the spread becomes 179 FPS, from 481 FPS on Low to 302 FPS on Ultra. This pattern suggests that at 1080p, the CPU is often the limiting factor, preventing the GPU from fully flexing its muscles even on Low settings, whereas at 4K, the GPU's pixel-pushing capabilities are the primary constraint.

The data indicates that the limiting component shifts based on resolution. At 3840x2160, the RTX 5080 is clearly the bottleneck, as even the most demanding preset (Ultra) yields 302 FPS, which is still far above the refresh rate of most monitors but shows the GPU is being taxed. At 1920x1080, the i5-9400's six threads become the constraint, as the difference between Low and Ultra (131 FPS) is smaller than at 1440p, implying the CPU cannot feed frames fast enough to fully saturate the GPU's potential.

How This Combo Ranks

In the database of tested combinations for Counter-Strike: Global Offensive, this specific pairing of the Intel Core i5-9400 and NVIDIA GeForce RTX 5080 holds the 387th position out of 3719 total combos. This places it comfortably in the top 10% of all tested systems, which is a strong result given the age of the processor. The rank reflects the system's ability to deliver extremely high average frame rates, particularly at 1080p and 1440p, where the scores are in the 500-870 FPS range.

However, the ranking also highlights the potential imbalance of the system. The RTX 5080 is a top-tier GPU that sits in the 87th percentile of all GPUs, while the i5-9400 is a mid-range part from a previous generation, sitting in the 47th percentile of all CPUs. The combo rank of 387 suggests that while the system performs exceptionally well in this CPU-light esports title, it is not reaching the absolute top echelon that a more modern processor might unlock, especially at lower resolutions where CPU overhead is more prominent.

The performance delta between this combo and others in the database underscores the CPU's role. While the exact frame rate differences are not listed for rivals, the CPU's nearest rivals in general benchmarks are all within 0.4% of its average score, indicating the i5-9400 is a known quantity. The GPU's nearest rivals, such as the AMD Radeon RX 9070 GRE, are within 2.2% of its average benchmark score, meaning the graphics card is also a well-understood performance tier. In CS:GO, this combo's rank of 387 out of 3719 demonstrates that it outperforms the vast majority of systems, even if it is not the absolute fastest configuration possible.

GPU Role

The NVIDIA GeForce RTX 5080 is the centerpiece of this build, and its specifications explain the exceptional frame rates. The GPU features 16 GB of GDDR7 memory on a 256-bit bus, providing a bandwidth of 960.0 GB/s. This high bandwidth is crucial for feeding the 10752 shading units at 4K resolutions, where texture and geometry data demands are highest. The card's boost clock of 2617 MHz, paired with a base clock of 2295 MHz, allows it to sustain high throughput in sustained gaming sessions.

The data shows that the RTX 5080's raw compute power is the primary driver of performance at 3840x2160. At 4K High, the average FPS is 354, which is 55% lower than at 1080p High. This indicates that the GPU is the limiting factor at this resolution. The card's FP32 performance of 56.28 TFLOPS is being fully utilized, as the rendering load scales with pixel count. The 4K Ultra preset, which likely enables more intensive shading and post-processing effects, drops the average to 302 FPS, showing a 15% performance penalty over High settings.

Interestingly, the GPU's memory subsystem appears sufficient for all tested settings. Even at 4K Ultra, the 16 GB VRAM buffer is not saturated, as evidenced by the stable average FPS of 302. The lack of min FPS data for most settings prevents a full analysis of frame pacing, but the Medium settings at 4K do show a min FPS of 348 and a max of 470, indicating a 122 FPS variance. This suggests that while the average frame rate is high, there can be significant swings in frame times, possibly due to CPU bottlenecks in certain scenes.

Measured FPS Breakdown

At 1920x1080, the system delivers exceptional performance across all presets. The Low preset produces an average of 872 FPS, which is the highest recorded score in the entire dataset. The Medium preset averages 824 FPS, with a min of 700 and max of 948, showing a broad range of frame times. High settings yield 783 FPS, while Ultra drops to 741 FPS. The tight spread of 131 FPS between Low and Ultra indicates that the CPU is the primary limiter at this resolution, as the GPU has ample headroom to render frames quickly.

Moving to 2560x1440, the frame rates remain extremely high but show a clearer GPU influence. The Low preset averages 770 FPS, which is a 12% drop from 1080p Low. Medium averages 693 FPS, with a min of 589 and max of 797, showing a larger variance than at 1080p. High settings produce 600 FPS, while Ultra drops to 512 FPS. The spread between Low and Ultra at 1440p is 258 FPS, which is double the 1080p spread, indicating that the GPU is beginning to become more of a factor.

At 3840x2160, the GPU becomes the clear bottleneck. The Low preset averages 481 FPS, which is still remarkably fast but represents a 45% drop from 1080p Low. Medium averages 409 FPS, with a min of 348 and max of 470, showing a 122 FPS variance. High settings produce 354 FPS, while Ultra drops to 302 FPS. The spread between Low and Ultra at 4K is 179 FPS, which is smaller than at 1440p, suggesting that the GPU is hitting a performance ceiling where additional settings changes have a diminishing impact on frame rate.

Settings Recommendations

For players with a 1920x1080 monitor, the data suggests that High settings provide the best balance of visual quality and performance. The 783 FPS average is well above the refresh rate of any current display, and the 131 FPS gap to Ultra is negligible in practical terms. The Low preset's 872 FPS offers no tangible benefit over High, as both are far beyond what a monitor can display. The Medium preset's 824 FPS is also viable, but High offers a better visual experience for the same practical performance.

At 2560x1440, the Medium preset appears to be the sweet spot. The 693 FPS average is still exceptionally high, and the min FPS of 589 ensures smooth gameplay even in demanding scenes. The High preset's 600 FPS is also excellent, but the Medium preset provides a 15% performance boost with a modest visual trade-off. The Ultra preset's 512 FPS is still playable, but the 258 FPS spread between Low and Ultra suggests that the GPU is being taxed more heavily, and Medium offers a better safety margin.

For 3840x2160 users, the Medium preset is the recommended choice. The 409 FPS average is more than sufficient for any competitive play, and the min FPS of 348 is still well above the 240Hz refresh rate of the fastest monitors. The High preset's 354 FPS is also viable, but the Medium preset delivers a 16% performance boost that could be crucial in high-action firefights. The Low preset's 481 FPS is overkill, and the visual degradation is not worth the extra frames. The Ultra preset's 302 FPS is playable but represents the first point where the system starts to feel less responsive.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor based on the Coffee Lake architecture, with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. It lacks Hyper-Threading, which means it has a limited thread count for modern workloads. In CS:GO, which is a title that typically scales well with single-core performance, the i5-9400's boost clock of 4.10 GHz is critical. The CPU's 9 MB of shared L3 cache helps reduce memory latency, which is beneficial for the game's physics and entity updates.

The benchmark results show that the CPU is the limiting factor at 1080p. The fact that the frame rate does not scale significantly between Low and Ultra settings at 1920x1080 indicates that the CPU is unable to feed the RTX 5080 enough frames to saturate its rendering pipeline. The i5-9400's average benchmark score of 2254 places it in the 47th percentile of all CPUs, which is a mid-pack result. Its nearest rivals, such as the Intel Core i7-10710U, are within 0.3% of its average score, showing that the i5-9400 is a representative six-core part from its era.

The CPU's performance at higher resolutions is less of a bottleneck. At 1440p and 4K, the GPU becomes the primary constraint, and the i5-9400 is able to keep up with the RTX 5080's output. However, the data shows that the CPU still has an impact on frame consistency. The Medium settings at 1440p show a min FPS of 589 and max of 797, a variance of 208 FPS, which suggests that the CPU is causing occasional frame dips in complex scenes. At 1080p Medium, the variance is 248 FPS, confirming that the CPU's six threads are being pushed to their limits in this esports title.