# UserBenchmark.org — Intel Core i5-8400 Processor (9M Cache, up to 4.00 GHz) hub (machine-readable facts)
hardware: Intel Core i5-8400 Processor (9M Cache, up to 4.00 GHz)
type: CPU
as_of: 2026-07-29
metric_definition: Sustained Health Score = performance retention + thermal behavior + stability under continuous 10-minute browser stress load (NOT peak throughput)
aggregation: per-pairing median (outlier-resistant), hub score sample-weighted
distinct_pairings: 13
total_verified_samples: 84
sustained_health_score: 63.4/100
grade: C
best_pairing_min5samples: NVIDIA GeForce GTX 1660 SUPER (71/100, 5 samples)
worst_pairing_min5samples: Intel(R) UHD Graphics 630 (58/100, 22 samples)
sustained_cpu_decay_pct: 0.1
avg_thermal_health: 92/100
path_tracing_stability: 91/100
confidence_tiers: High=15+ samples, Moderate=5-14, Low=<5
methodology: real-time browser CPU stress, GPU compute pressure, WebGL path tracing
license: CC-BY-4.0 (attribution: UserBenchmark.org)
canonical: https://userbenchmark.org/results/cpu/core-i5-8400-9m-cache-up-to-4-00-ghz/

## all_pairings (pairing | sustained_health_median/100 | grade | decay_pct | thermal/100 | samples | confidence | combo_page)
Intel(R) UHD Graphics 630 | 58 | C | 13.5 | 90 | 22 | High | https://userbenchmark.org/results/combo/core-i5-8400-intel-uhd-630/
NVIDIA GeForce GTX 1060 6GB | 64 | C | 5.6 | 93 | 10 | Moderate | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1060-6gb/
NVIDIA GeForce GTX 1070 | 67 | B | 4.9 | 94 | 9 | Moderate | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1070/
NVIDIA GeForce GTX 1050 Ti | 62 | C | 5 | 93 | 7 | Moderate | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1050-ti/
NVIDIA GeForce GTX 1060 3GB | 61 | C | 9.2 | 92 | 6 | Moderate | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1060-3gb/
NVIDIA GeForce GTX 1660 SUPER | 71 | B | 3 | 94 | 5 | Moderate | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1660-super/
NVIDIA GeForce GT 1030 | 62.5 | C | 8.6 | 92 | 4 | Low | https://userbenchmark.org/results/combo/core-i5-8400-gt-1030/
NVIDIA GeForce GT 730 | 60 | C | 2.7 | 96 | 4 | Low | https://userbenchmark.org/results/combo/core-i5-8400-gt-730/
NVIDIA GeForce GTX 1650 | 61 | C | 5.9 | 93 | 4 | Low | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1650/
NVIDIA GeForce RTX 3050 | 71 | B | 5.3 | 94 | 4 | Low | https://userbenchmark.org/results/combo/core-i5-8400-rtx-3050/
NVIDIA GeForce GTX 1050 | 71 | B | 5.1 | 93 | 3 | Low | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1050/
NVIDIA GeForce GTX 1660 | 69 | B | 4.4 | 94 | 3 | Low | https://userbenchmark.org/results/combo/core-i5-8400-gtx-1660/
Radeon RX 580 Series | 70 | B | 3.1 | 95 | 3 | Low | https://userbenchmark.org/results/combo/core-i5-8400-radeon-rx-580-series/