Roblox

The Intel Core i5-9400 paired with the Intel Arc B390 delivers a surprisingly playable Roblox experience across most resolutions, though the data reveals a clear ceiling. The measured frames per second (FPS) show that this combo is best suited for high-refresh-rate 1080p gaming or smooth 1440p play, with 4K reserved for lower presets. The Arc B390, despite its low overall GPU percentile, demonstrates adequate headroom for this sandbox title, but the system's performance scaling suggests that the integrated graphics are the primary limiting factor at higher resolutions. This analysis breaks down the measured data to determine the optimal settings, contextualize the combo's standing among tested configurations, and explain the roles of both the CPU and GPU in producing these results.

Settings Recommendations

Based on the measured FPS rows, the Medium preset at 1920x1080 offers the most balanced experience, delivering an average of 155 FPS. This is only 16 FPS below the Low preset's 171 FPS average but provides a significant visual upgrade over Low. The Medium preset also offers the only complete FPS data set in the pack, with a minimum of 132 FPS and a maximum of 179 FPS at 1080p. This consistency indicates that the preset is well within the hardware's capabilities, avoiding the frame dips that can occur when pushing the system harder.

For players prioritizing maximum visual fidelity, the High preset at 2560x1440 is a strong contender, producing an average of 92 FPS. This is comfortably above the 60 FPS threshold for smooth gameplay and shows that the hardware can handle a higher resolution without sacrificing too much fluidity. While the Ultra preset at 1440p achieves 74 FPS on average, the jump from High to Ultra costs 18 FPS, a significant drop for marginal visual gains. The data suggests that High is the sweet spot for 1440p, offering a near-100 FPS experience without the performance penalty of Ultra.

At 4K, the situation changes drastically. The Low preset at 3840x2160 yields an average of 64 FPS, which is the only 4K option that maintains a playable frame rate. The Medium preset at 4K drops to 59 FPS, and High falls to 52 FPS, while Ultra plummets to 42 FPS. Given that Roblox is a sandbox game where visual clarity at distance can be important, the Low preset's 64 FPS average is the only viable option for 4K play. The step from Low to Medium at this resolution only costs 5 FPS, but the subsequent steps to High and Ultra cost 7 and 17 FPS respectively, making the higher presets increasingly difficult to justify.

How This Combo Ranks

The benchmark database places this specific combination at rank 2661 out of 3010 tested combos for Roblox. This places the system in the bottom 12% of all tested configurations, which aligns with the hardware's individual specifications. The Intel Core i5-9400 sits at the 47th percentile among all CPUs, while the Intel Arc B390 is at the 9th percentile among all GPUs. The combo's low rank is largely attributable to the GPU, which is a significant bottleneck in this pairing.

Looking at the GPU's nearest rivals, the Arc B390's average benchmark score of 1482 is only 1.3% higher than the NVIDIA GeForce GT 520MX (1463) and 1.5% higher than the NVIDIA GeForce 800M (1460). This places the Arc B390 in extremely modest company, competing with entry-level graphics solutions from over a decade ago. Despite this low standing in general GPU benchmarks, the measured FPS in Roblox shows that the Arc B390 manages to deliver playable frame rates at 1080p and 1440p, indicating that Roblox is not a particularly demanding title for this hardware.

The CPU's position is comparatively stronger. The i5-9400's average benchmark score of 2254 places it within 0.4% of the AMD Ryzen 5 PRO 1500 (2246) and 0.3% behind the Intel Core i7-10710U (2248). This suggests that the CPU is a competent mid-range part, but it is not a performance leader. In the context of Roblox, the CPU's six cores and six threads are sufficient to feed the GPU, but the overall combo rank reflects the GPU's inability to match the CPU's relative strength.

GPU Role

The Intel Arc B390 is an integrated graphics solution built on the Xe3-LPG architecture with a 3 nm process node. It features 1536 shading units, 48 texture mapping units, and 24 raster operations pipelines. The GPU operates at a base clock of 300 MHz and boosts up to 2500 MHz. Critically, the memory configuration is listed as "System Shared," meaning the GPU relies on the system's main memory rather than dedicated VRAM. This shared memory architecture is a primary reason for the GPU's low 9th percentile ranking among all GPUs.

The GPU's memory bandwidth is described as "System Dependent," which means performance scales with the CPU's memory support. The i5-9400 supports dual-channel DDR4 memory with a bandwidth of 42.7 GB/s. This shared memory setup can create a bottleneck, especially at higher resolutions where the GPU needs to access more data. The measured FPS data supports this hypothesis: at 4K Ultra, the average FPS drops to 42, suggesting the GPU is struggling with memory bandwidth constraints. The pixel rate of 60.00 GPixel/s and texture rate of 120.0 GTexel/s are modest figures, but they are sufficient for Roblox's relatively simple block-based graphics.

The GPU's FP32 performance is rated at 7.680 TFLOPS, which is a solid theoretical figure for an integrated solution. However, the actual gaming performance is limited by the shared memory and the lack of dedicated VRAM. In Roblox, the measured FPS at 1080p Low (171 FPS) versus 1080p Ultra (111 FPS) shows a 60 FPS drop, indicating that the GPU's compute units are capable of high frame rates but are constrained by memory bandwidth when settings increase. The GPU's DirectX 12 Ultimate support ensures compatibility with modern rendering features, but Roblox's engine does not appear to leverage these heavily, based on the performance numbers.

Measured FPS Breakdown

At 1920x1080, the combo demonstrates strong performance across all settings. The Low preset averages 171 FPS, which is the highest measured frame rate in the entire data set. Medium averages 155 FPS with a minimum of 132 FPS and a maximum of 179 FPS. High averages 137 FPS, and Ultra averages 111 FPS. The scaling from Low to Ultra shows a 60 FPS drop, which is a 35% reduction in performance. This indicates that while the GPU can handle high frame rates at lower settings, the higher presets impose a significant load that reduces headroom.

At 2560x1440, the frame rates remain playable but show a clear step down. Low averages 114 FPS, Medium averages 104 FPS with a minimum of 88 FPS and a maximum of 119 FPS, High averages 92 FPS, and Ultra averages 74 FPS. The drop from 1080p to 1440p at the same settings is notable: Low loses 57 FPS, Medium loses 51 FPS, High loses 45 FPS, and Ultra loses 37 FPS. This scaling suggests that the GPU is becoming the limiting factor as resolution increases, but it still manages to keep the average above 70 FPS even at Ultra.

At 3840x2160, the performance takes a significant hit. Low averages 64 FPS, Medium averages 59 FPS with a minimum of 50 FPS and a maximum of 67 FPS, High averages 52 FPS, and Ultra averages 42 FPS. The 4K Low preset is the only one that maintains an average above 60 FPS. The Medium preset's minimum of 50 FPS indicates that frame pacing can become inconsistent, which could lead to noticeable stutters. The drop from 1440p to 4K at the same settings is severe: Low loses 50 FPS, Medium loses 45 FPS, High loses 40 FPS, and Ultra loses 32 FPS. This dramatic scaling reinforces the conclusion that the GPU is the primary bottleneck at 4K.

Resolution Scaling

The FPS data reveals a clear pattern of performance degradation as resolution increases. From 1080p to 1440p, the average FPS drops by approximately 33-40% across all settings. For example, High settings drop from 137 FPS at 1080p to 92 FPS at 1440p, a 45 FPS reduction. This is a substantial decrease, but the resulting frame rates are still playable. The scaling from 1440p to 4K is even more punishing, with High settings dropping from 92 FPS to 52 FPS, a 40 FPS reduction. This steeper decline at higher resolutions indicates that the GPU's memory bandwidth and processing power are being stretched beyond their comfortable limits.

The resolution scaling behavior points to the GPU as the limiting component. The CPU's performance remains constant regardless of resolution, so the FPS drops are entirely attributable to the GPU's workload increasing. The i5-9400, with its six cores and six threads, is capable of maintaining high frame rates in Roblox, as evidenced by the 171 FPS at 1080p Low. However, as resolution increases, the GPU must process more pixels, and the shared memory architecture becomes a bottleneck. The fact that the FPS drop from 1080p to 4K is roughly proportional across all settings suggests that the GPU is consistently the limiting factor, rather than a sudden CPU constraint.

The data shows that the system is well-balanced for 1080p, where the CPU and GPU can work together to produce high frame rates. At 1440p, the GPU begins to lag behind the CPU's capabilities, but the system remains playable. At 4K, the GPU is clearly overwhelmed, and the frame rates reflect this. The measured FPS at 4K Ultra (42 FPS) is less than 25% of the 1080p Low result (171 FPS), highlighting the GPU's inability to handle the pixel throughput required at higher resolutions.

FAQ

Q: What is the best resolution and settings combo for this system in Roblox?

A: Based on the measured data, 1920x1080 with Medium settings provides the best balance, delivering an average of 155 FPS with a minimum of 132 FPS. This offers high frame rates without the visual compromises of Low settings.

Q: Can this system handle 4K gaming in Roblox?

A: Yes, but only at Low settings, which averages 64 FPS. Medium settings at 4K average 59 FPS, while High and Ultra drop to 52 FPS and 42 FPS respectively, making them less desirable for smooth gameplay.

Q: How does the Intel Arc B390 compare to its nearest rivals?

A: The Arc B390's average benchmark score of 1482 is 1.3% higher than the NVIDIA GeForce GT 520MX and 2.7% higher than the NVIDIA GeForce GT 710. This places it in the entry-level segment of the GPU market.

Q: Is the CPU or GPU the limiting factor in this combo?

A: The GPU is the limiting factor, especially at higher resolutions. The i5-9400 is capable of supporting high frame rates, as shown by the 171 FPS at 1080p Low, but the Arc B390's shared memory architecture causes significant FPS drops when resolution increases.

Q: What is the combo's rank among all tested configurations for Roblox?

A: This combo ranks 2661 out of 3010 tested combos, placing it in the bottom 12% of all configurations. This low rank is primarily due to the GPU's modest performance relative to other tested graphics solutions.

Q: What are the minimum and maximum FPS recorded for this system?

A: The highest minimum FPS recorded is 132 FPS at 1080p Medium, and the highest maximum FPS is 179 FPS at the same settings. The lowest average FPS is 42 FPS at 4K Ultra.

CPU Role

The Intel Core i5-9400 is a six-core, six-thread processor based on the Coffee Lake architecture. It has a base clock of 2.90 GHz and a boost clock of 4.10 GHz, with a 65 W TDP. The CPU's cache configuration includes 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 9 MB of shared L3 cache. This setup provides adequate performance for gaming, as evidenced by the CPU's 47th percentile ranking among all CPUs.

In Roblox, the CPU's role is to feed the GPU with draw calls and physics calculations. The i5-9400's six physical cores are sufficient for this task, as the game is not heavily multithreaded. The CPU's single-core performance, measured at 935 in Cinebench R23, is adequate for the game's single-threaded nature. The measured FPS at 1080p Low (171 FPS) indicates that the CPU is not a bottleneck at lower resolutions, as the frame rate is likely capped by the GPU's output.

However, the CPU's performance does have an upper limit. The average benchmark score of 2254 places it near the AMD Ryzen 5 PRO 1500 (2246) and Intel Core i7-10710U (2248), indicating that it is a mid-range processor. In Roblox, the CPU's multi-core performance, measured at 6629 in Cinebench R23, is more than sufficient for the game's demands. The data shows that the CPU can maintain high frame rates, but the GPU's limitations at higher resolutions prevent the system from fully utilizing the CPU's potential. The CPU's 9 MB of shared L3 cache is ample for Roblox's data requirements, and the dual-channel DDR4 memory support with 42.7 GB/s bandwidth provides sufficient memory throughput for the GPU's shared memory architecture.