Thief

# Thief with Intel Core i5-9400 + AMD Radeon RX 6650 XT

The Intel Core i5-9400 paired with the AMD Radeon RX 6650 XT delivers a playable but uneven experience in Thief, a 2014 stealth title that responds strongly to both CPU and GPU headroom depending on the resolution and preset. At 1080p, the combo sustains near-triple-digit frame rates across most settings, but the frame rate curve flattens dramatically as resolution climbs, revealing a GPU that becomes the dominant constraint at 4K. The data set includes twelve measured average-FPS points spanning three resolutions and four quality presets, providing a clear picture of how this mid-range pairing behaves in a game from the previous console generation.

Resolution Scaling

The measured FPS values show a steep, predictable decline as resolution increases, but the magnitude of that drop varies significantly by preset. At Low settings, the transition from 1920x1080 to 3840x2160 cuts the average frame rate from 118 FPS to 65.2 FPS, a 44.7% reduction. The Medium preset follows a similar pattern: 108.9 FPS at 1080p falls to 51.8 FPS at 4K, a 52.4% drop. High settings see the frame rate go from 93.9 FPS down to 35.7 FPS, a 62% reduction, while Ultra drops from 89.4 FPS to 39.1 FPS, a 56.3% decline.

The scaling behavior indicates that at 1080p, even the Ultra preset leaves headroom on the table, with the gap between Low and Ultra at that resolution being only 28.6 FPS (118 vs 89.4). At 1440p, the spread widens to 41.4 FPS (104.8 Low vs 63.4 Ultra), and at 4K it narrows again to 26.1 FPS (65.2 Low vs 39.1 Ultra). This narrowing at 4K is the signature of a GPU-bound scenario: when pixel throughput becomes the bottleneck, lowering quality settings recovers less performance because the Radeon RX 6650 XT's 8 GB frame buffer and 280.3 GB/s memory bandwidth are being saturated regardless of preset.

The 1440p data point is particularly telling. High and Ultra at 2560x1440 yield 62.2 FPS and 63.4 FPS respectively, a mere 1.2 FPS difference, while Low jumps to 104.8 FPS. This suggests that at 1440p, the GPU's shading units and texture units are the limiting factor for the higher presets, but dropping to Low relieves enough of the shading load to approach the 1080p High experience. The 4K results reinforce this: the jump from Ultra (39.1 FPS) to Low (65.2 FPS) is a 66.8% improvement, showing that Thief's quality settings have a substantial impact on pixel shader workload even when the GPU is clearly the constraint.

How This Combo Ranks

The Intel Core i5-9400 and AMD Radeon RX 6650 XT combination ranks 1259 out of 1642 tested combos specifically for Thief, placing it in the lower-middle portion of the database. This percentile position — roughly the 23rd percentile of tested configurations — might seem low given the GPU's strong standalone metrics, but it reflects the fact that Thief's engine is not particularly demanding by modern standards, and many newer, faster CPUs and GPUs will push far higher frame rates in this title.

The CPU alone, the Core i5-9400, sits at the 50th percentile among all tested CPUs, with an average benchmark score of 2305 across the synthetic suite. Its nearest rivals include the Intel Core i3-10305 (score 2300, delta +0.2%), the Intel Core i3-1125G4 (score 2299, delta +0.2%), and the Intel Xeon E-2134 (score 2295, delta +0.4%), while the Intel Core i7-8809G edges ahead with a score of 2319 (delta -0.6%). These deltas are all within 1%, indicating that the i5-9400's six-core, six-thread configuration with a 2.90 GHz base and 4.10 GHz boost is essentially performance-equivalent to those alternatives in aggregate workloads.

The GPU, Radeon RX 6650 XT, ranks at the 72nd percentile among all GPUs, with an average benchmark score of 29024. Its nearest rivals are tightly clustered: the AMD Radeon RX 6800M matches at 29011 (delta 0%), the AMD Radeon RX 470 scores 28996 (delta +0.1%), the Intel Arc A370M scores 29175 (delta -0.5%), and the AMD Radeon RX Vega M GH scores 29197 (delta -0.6%). This clustering shows the RX 6650 XT is a solid mid-pack performer in synthetic tests, but its Thief-specific combo ranking of 1259/1642 suggests the game's engine does not extract the full potential from this pairing, likely due to the CPU's modest single-thread performance in a title that relies on draw-call processing.

GPU Role

The Radeon RX 6650 XT brings 8 GB of GDDR6 memory on a 128-bit bus, delivering 280.3 GB/s of bandwidth. Its clock speeds are aggressive for the segment: a 2055 MHz base, 2410 MHz game clock, and 2635 MHz boost, with memory running at 2190 MHz (17.5 Gbps effective). These specifications translate to a pixel rate of 168.6 GPixel/s and a texture rate of 337.3 GTexel/s, figures that are more than adequate for a 2014 title like Thief, which was designed for the hardware of its era.

The 8 GB frame buffer is not a constraint at any of the tested resolutions or presets, as Thief's texture budgets are modest by today's standards. The GPU's 2048 shading units and 64 ROPs handle the game's lighting and shadow effects without apparent spillover, but the measured FPS at 4K Ultra (39.1 FPS) indicates that raw fill-rate and shading throughput become the limiting factors. The FP32 performance of 10.79 TFLOPS is sufficient for 1080p and 1440p gaming, but at 4K the GPU's 128-bit memory interface and 280.3 GB/s bandwidth create a bottleneck, consistent with the 4K scaling behavior noted earlier.

The GPU's standalone benchmark profile reinforces its mid-range positioning. Its 3DMark Steel Nomad DX12 score is 1859, while Geekbench scores show 109922 in Metal, 87548 in OpenCL, and 93769 in Vulkan. The Passmark results are more granular: DirectX 9 scores 215, DirectX 10 scores 109, DirectX 11 scores 169, and DirectX 12 scores 62. The DirectX 9 score being the highest of the legacy API tests is notable for Thief, which launched in 2014 and uses DirectX 11 as its primary API; the GPU's DirectX 11 score of 169 suggests it can handle the game's feature set without difficulty.

Measured FPS Breakdown

At 1920x1080, the combo delivers its strongest results. Low settings average 118 FPS, Medium averages 108.9 FPS, High averages 93.9 FPS, and Ultra averages 89.4 FPS. The delta between Low and Ultra is 28.6 FPS, with the largest single-step drop occurring from Low to Medium (9.1 FPS) and the smallest from High to Ultra (4.5 FPS). This suggests that the Ultra preset's additional effects are relatively cheap at 1080p, and the CPU is not holding the GPU back at this resolution.

Moving to 2560x1440, the frame rates decline across the board: Low averages 104.8 FPS, Medium 83.5 FPS, High 62.2 FPS, and Ultra 63.4 FPS. The High-to-Ultra inversion (Ultra is 1.2 FPS faster than High) is within measurement noise, but the pattern is clear: the GPU's shading capacity is the limiting factor at 1440p for the higher presets. The Low preset at 1440p (104.8 FPS) is only 13.2 FPS slower than Low at 1080p (118 FPS), indicating that the GPU still has headroom when the quality settings are reduced.

At 3840x2160, the numbers drop further: Low averages 65.2 FPS, Medium 51.8 FPS, High 35.7 FPS, and Ultra 39.1 FPS. Again, High and Ultra are nearly identical (a 3.4 FPS difference), while Low is 26.1 FPS faster than Ultra. The 4K Low result of 65.2 FPS is the only 4K preset that clears the 60 FPS threshold, and it does so by a slim margin. The 4K Medium result of 51.8 FPS is playable but not smooth, and both High and Ultra fall below 40 FPS, which would be noticeable in a stealth game requiring precise timing.

FAQ

Q: What is the best resolution to play Thief with this combo?

A: The data shows 1920x1080 is the sweet spot, with all four presets averaging above 89 FPS. At 2560x1440, only Low and Medium clear 80 FPS, while High and Ultra hover in the low 60s. At 3840x2160, only Low exceeds 60 FPS (65.2 FPS), so 1080p is recommended for a consistently smooth experience.

Q: How much performance is lost when moving from 1080p to 4K on the Ultra preset?

A: The Ultra preset drops from 89.4 FPS at 1920x1080 to 39.1 FPS at 3840x2160, a reduction of 50.3 FPS or 56.3%. This indicates the GPU becomes the primary bottleneck at 4K, with pixel throughput limiting the frame rate.

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

A: At 1080p, the CPU appears sufficient, as frame rates scale predictably with quality settings. At 4K, the GPU is clearly the constraint, evidenced by the narrow gap between High (35.7 FPS) and Ultra (39.1 FPS) presets. The CPU's 50th percentile ranking and the GPU's 72nd percentile ranking suggest the GPU is the stronger component, but Thief's engine limits overall performance.

Q: How does this combo compare to other tested configurations?

A: The combo ranks 1259 out of 1642 tested combos for Thief, placing it in the lower-middle tier. This is lower than the GPU's standalone percentile (72nd) or the CPU's (50th), indicating that the specific pairing does not synergize as well in this game as it might in other titles.

Q: What is the difference between High and Ultra presets at each resolution?

A: At 1080p, High averages 93.9 FPS and Ultra 89.4 FPS (4.5 FPS difference). At 1440p, High averages 62.2 FPS and Ultra 63.4 FPS (1.2 FPS difference, effectively identical). At 4K, High averages 35.7 FPS and Ultra 39.1 FPS (3.4 FPS difference). The Ultra preset's additional cost is minimal across all resolutions.

Q: Can this combo maintain 60 FPS at 1440p?

A: Yes, but only with lower presets. Low averages 104.8 FPS and Medium 83.5 FPS at 2560x1440. High and Ultra both fall below 64 FPS, so a 60 FPS cap would be achievable on High with slight dips, but Medium is the safest choice for a locked 60 FPS experience.

Settings Recommendations

Based on the measured FPS data, the best experience-to-performance balance depends on the target resolution. At 1920x1080, the Ultra preset at 89.4 FPS is the clear recommendation, as it delivers the highest visual quality while maintaining a frame rate well above 60 FPS. The 4.5 FPS difference between High and Ultra at this resolution makes Ultra the obvious choice, as the visual uplift costs almost nothing in performance.

For 2560x1440, the Medium preset at 83.5 FPS offers the best combination of visual fidelity and smoothness. Low at 104.8 FPS is faster but sacrifices too much visual quality, while High at 62.2 FPS and Ultra at 63.4 FPS are close to 60 FPS but risk occasional dips below that threshold. Medium provides a comfortable margin above 60 FPS while retaining most of the game's visual effects.

At 3840x2160, the Low preset at 65.2 FPS is the only option that consistently exceeds 60 FPS, and even that is a slim margin. Medium at 51.8 FPS is playable for those willing to tolerate occasional frame drops, but High (35.7 FPS) and Ultra (39.1 FPS) are too slow for a stealth game where reaction timing matters. For 4K owners, the Low preset is the recommended choice, while players prioritizing visual quality should consider dropping to 1440p Medium instead. The data overall suggests that 1080p Ultra is the intended target for this pairing, delivering the full Thief experience without compromise.