Counter-Strike: Global Offensive

Counter-Strike: Global Offensive is an old engine title that becomes extremely CPU-bound at high frame rates, and this particular pairing of the Intel Core i5-9400 with the NVIDIA GeForce RTX 3080 shows that dynamic clearly. The data indicates that the RTX 3080 is rarely the limiting factor here; instead, the six-core i5-9400 determines the ceiling. The measured results show that even at 4K, the lowest preset yields 346.6 FPS average, which is far beyond what most displays can refresh. The practical takeaway is that you should prioritize frame rate stability and consistency over visual fidelity in this specific title, as the hardware is more than capable of delivering competitive esports-level performance at any resolution tested.

Settings Recommendations

The measured FPS rows reveal a clear pattern: the Low preset provides the highest average frame rates across all resolutions, but the gap between Low and High is smaller than the gap between High and Ultra. At 1920x1080, the Low preset achieves 853.4 FPS average, while High drops to 627.4 FPS. This 226 FPS difference is substantial, but the jump from High to Ultra costs another 91 FPS, landing at 536.4 FPS. For competitive play, the Low preset is the obvious choice, as it maximizes the frame rate headroom and minimizes input latency potential. However, the data also shows that High settings at 2560x1440 still produce 432.6 FPS average, which is above the refresh rate of most high-end 1440p monitors. The Medium preset offers a balanced middle ground: at 1080p it yields 729.8 FPS, and at 1440p it produces 498.9 FPS, making it a sensible choice for players who want slightly better visuals without sacrificing the frame rate advantage. The Ultra preset is the only one that shows any sign of strain, with 222.1 FPS at 4K, but even that figure is playable on high refresh rate displays. Given that CS:GO rewards higher frame rates with smoother aim and reduced tearing, the recommendation is to run the Low or Medium preset at your native resolution, unless you have a 240Hz or higher monitor and need the absolute maximum FPS.

GPU Role

The NVIDIA GeForce RTX 3080 is a massive GPU by any measure, with 10 GB of GDDR6X memory on a 320-bit bus delivering 760.3 GB/s of bandwidth. Its boost clock of 1710 MHz and FP32 performance of 29.77 TFLOPS are far beyond what CS:GO requires. The benchmark results confirm this: moving from Low to Ultra settings at any resolution changes the frame rate, but the GPU still never dips below 222.1 FPS even at 4K Ultra. The VRAM usage is not a concern here, as CS:GO is a lightweight title that will not come close to saturating the 10 GB frame buffer. The clock speeds matter more for the minimum frame rate consistency than for the average, as the GPU is essentially idling relative to its full capabilities. The data shows that the RTX 3080 is overkill for this game, and its role is mostly to ensure that the frame rate is never GPU-limited, which allows the CPU to become the sole bottleneck. At 4K, the GPU does start to show some influence, as the Ultra preset drops to 222.1 FPS versus the Low preset at 346.6 FPS, a 124.5 FPS difference that indicates the GPU is finally doing some work. Even in that scenario, the performance is exceptional, and the RTX 3080's raw throughput is more than sufficient for CS:GO at any settings.

How This Combo Ranks

The combination of the Intel Core i5-9400 and the NVIDIA GeForce RTX 3080 ranks 525 out of 1605 tested combos in this game. This places it in the upper third of all configurations, which is respectable but not elite. The ranking is heavily influenced by the CPU, as the RTX 3080 is one of the faster GPUs available, but the i5-9400 is a mid-range processor from 2018. In CS:GO, which is notoriously CPU-bound, the i5-9400's six cores and six threads without hyper-threading hold the combo back from the top positions. The nearest rival comparisons for the CPU show that it is essentially tied with the Intel Core i3-10305 (0.2% delta) and the Intel Core i3-1125G4 (0.2% delta), while being 0.6% slower than the Intel Core i7-8809G. This tells you that the i5-9400 is performing exactly at its expected level, and the combo rank is more a reflection of the CPU's mid-pack standing than any GPU deficiency. The RTX 3080 itself ranks in the 80th percentile of all GPUs, but in this game, that GPU strength is partially wasted because the CPU cannot feed it frames fast enough to fully utilize its potential. The 525th rank out of 1605 indicates that there are many combos with faster CPUs that will achieve higher frame rates, even with weaker GPUs, which is a critical insight for anyone considering this pairing.

Measured FPS Breakdown

At 1920x1080, the frame rates are exceptionally high across all settings. The Low preset delivers 853.4 FPS average, which is the highest score in the entire dataset. Medium drops to 729.8 FPS, High falls to 627.4 FPS, and Ultra bottoms out at 536.4 FPS. The spread from Low to Ultra is 317 FPS, which shows that settings have a meaningful impact even at this resolution. Moving to 2560x1440, the numbers remain impressive but show a clear step down. Low produces 589.5 FPS, Medium achieves 498.9 FPS, High reaches 432.6 FPS, and Ultra drops to 371.5 FPS. The gap between Low and Ultra here is 218 FPS, slightly smaller than at 1080p. At 3840x2160, the GPU starts to become more relevant. Low still yields 346.6 FPS, Medium hits 295.8 FPS, High manages 253.5 FPS, and Ultra falls to 222.1 FPS. The difference between Low and Ultra at 4K is 124.5 FPS, which is roughly half the spread seen at 1080p. This pattern indicates that the CPU bottleneck is most severe at lower resolutions, where the GPU can render frames quickly but the CPU cannot keep up with the game's logic and draw calls. At 4K, the GPU workload increases enough to balance the system better, but the frame rates are still so high that they exceed the refresh rate of virtually all monitors on the market. The data shows that this combo is capable of running CS:GO at over 200 FPS in every scenario tested, with the 1080p Low preset being the absolute peak performance configuration.

FAQ

Q: What is the best resolution for this combo in CS:GO?

A: The data shows that 1920x1080 with Low settings produces the highest average FPS at 853.4, but all resolutions deliver playable frame rates. For competitive play, 1080p Low is optimal, while 1440p High at 432.6 FPS is still excellent for high refresh rate monitors.

Q: Is the RTX 3080 necessary for CS:GO with the i5-9400?

A: The benchmark results indicate that the RTX 3080 is overkill for this title, since the CPU is the bottleneck. The GPU's 10 GB VRAM and 760.3 GB/s bandwidth are never stressed, and the frame rates are limited by the i5-9400's six-core design rather than the GPU's capabilities.

Q: How does the i5-9400 perform relative to its closest rivals?

A: The i5-9400's average benchmark score is 2305, which is 0.2% higher than the Intel Core i3-10305 and the Intel Core i3-1125G4, and 0.6% lower than the Intel Core i7-8809G. This places it in the 50th percentile of all CPUs, meaning it is exactly average in the broader context.

Q: What frame rate can I expect at 4K with Ultra settings?

A: The measured data shows 222.1 FPS average at 3840x2160 with Ultra settings. This is the lowest result in the dataset, but it remains well above the 144Hz refresh rate that most 4K gaming monitors offer.

Q: Does the Low preset provide a significant advantage over High?

A: Yes, the Low preset yields 853.4 FPS at 1080p versus 627.4 FPS for High, a difference of 226 FPS. At 1440p, the gap is 156.9 FPS (589.5 vs 432.6), and at 4K it is 93.1 FPS (346.6 vs 253.5). The advantage shrinks as resolution increases.

Q: Is this combo ranked highly among all tested configurations?

A: This combo ranks 525 out of 1605 tested combos, putting it in the upper third. The ranking is limited by the CPU, as the RTX 3080 is in the 80th percentile of GPUs, but the i5-9400 holds the combo back from higher positions in this CPU-intensive game.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor based on the Coffee Lake architecture, manufactured on Intel's 14 nm process node. It has a base clock of 2.90 GHz and a boost clock of 4.10 GHz, with 9 MB of shared L3 cache and a 65 W TDP. In CS:GO, this CPU is the primary bottleneck, as the game relies heavily on single-threaded performance and low latency. The i5-9400 lacks hyper-threading, which means it has six threads to work with, and the game engine does not scale well beyond that count. The boost clock of 4.10 GHz is respectable, but it is not exceptional by modern standards, and the CPU's 50th percentile ranking among all processors reflects its mid-range status. The benchmark results show that the CPU's performance in this game is consistent with its Cinebench scores, where it achieves 1125 in R23 single-core and 7969 in R23 multi-core. The multi-core score of 3346 in R20 and 803 in R15 further confirm that this is a competent but not high-end processor. In CS:GO, the i5-9400's six cores are sufficient to maintain high frame rates, but the lack of additional threads means that background tasks or heavy game logic can cause frame time spikes. The data shows that the CPU is the limiting factor at 1080p, where the GPU can render frames far faster than the CPU can issue draw calls, resulting in the 853.4 FPS ceiling at Low settings. At 4K, the GPU workload increases enough to shift the balance, but the CPU still prevents the combo from reaching the performance level of combos with faster processors. For this pairing, the CPU is the component that determines the overall experience, and its mid-pack ranking explains why this combo sits at 525 out of 1605.