Core i5-8400 vs Core i9-9900KS
The Core i5-8400 is same performance as the Core i9-9900KS on average across 100+ games. We cannot compare value as at least one CPU is out of stock.
HowManyFPS Team · Prices updated · FPS from real gameplay sessions · Browse benchmarks
FPS Comparison Across Popular Games
Predicted average FPS at 1080p, 1440p, and 4K, based on real game benchmarks.
Specs & Benchmark Comparison
Side-by-side specs, synthetic benchmarks, and key hardware differences.
LGA1151
Sockethelp
LGA1151Coffee Lake
Codenamehelp
Coffee Lake-RDesktop
Segmenthelp
DesktopUHD Graphics 630
Integrated GPUhelp
UHD Graphics 6302666 MHz (DDR4)
RAMhelp
2666 MHz (DDR4)Not Overclockable
Overclock Supporthelp
OverclockableFrequently Asked Questions
compare_arrowsWhich is better, Core i5-8400 or Core i9-9900KS?expand_more
Neither, they're within 1% of each other across 100+ games. Pick based on price, availability, or platform compatibility.
aspect_ratioWhich is better for 1440p and 4K gaming, Core i5-8400 or Core i9-9900KS?expand_more
They trade blows depending on the game. Toggle the resolution selector above to compare per-game FPS at 1440p and 4K.
differenceWhat is the difference between Core i5-8400 and Core i9-9900KS?expand_more
Performance: Core i5-8400 scores 41/100, Core i9-9900KS scores 41/100. They also differ in core count, clock speeds, L3 cache, and power draw. Full breakdown in the specs section above.
compressWill the Core i5-8400 or Core i9-9900KS bottleneck my PC?expand_more
Depends on the rest of your build, especially your GPU. Swap the paired GPU in the FPS section above to see if it limits performance, or use our bottleneck calculator for a full analysis.
upgradeIs it worth upgrading to the Core i5-8400 or Core i9-9900KS?expand_more
Both are solid choices. Compare your current CPU against each one to see the exact FPS gain.
Popular Comparisons
i5-8400 vs Ryzen 7 7800X3Di5-8400 vs Ryzen 5 7600Xi5-8400 vs Ryzen 9 9950X3Di5-8400 vs Ryzen 7 7700Xi5-8400 vs Ryzen 9 9900Xi5-8400 vs Ryzen 7 9850X3Di5-8400 vs Ryzen 7 9700Xi5-8400 vs Ryzen 5 8500Gi5-8400 vs Ultra 7 265KFi5-8400 vs Ryzen 9 9900X3Di3-12100F vs i5-8400i5-8400 vs Ryzen 5 7500X3DAtom D510 vs i5-8400Athlon II X2 240 vs i5-8400i5-8400 vs Ryzen 7 9800X3Di5-8400 vs Pentium E5400i5-8400 vs Ultra 5 245Ki5-8400 vs Ultra 5 245KFi9-9900KS vs Ryzen 7 7800X3Di9-9900KS vs Ryzen 5 7600Xi9-9900KS vs Ryzen 9 9950X3Di9-9900KS vs Ryzen 7 7700Xi9-9900KS vs Ryzen 9 9900Xi9-9900KS vs Ryzen 7 9850X3Di9-9900KS vs Ryzen 7 9700Xi9-9900KS vs Ryzen 5 8500Gi9-9900KS vs Ultra 7 265KFi9-9900KS vs Ryzen 9 9900X3Di3-12100F vs i9-9900KSi9-9900KS vs Ryzen 5 7500X3DAtom D510 vs i9-9900KSAthlon II X2 240 vs i9-9900KSi9-9900KS vs Ryzen 7 9800X3Di9-9900KS vs Pentium E5400i9-9900KS vs Ultra 5 245Ki9-9900KS vs Ultra 5 245KF