Core i5-8600K vs Core i5-6400
Short answer: which is best?
Core i5-8600K is 57.1 % stronger than Core i5-6400. Core i5-8600K ranks #78 of 99 measured processors at WhatFPS (5,461 CPU score over 1 verified runs). Core i5-6400 ranks #95 of 99 measured processors at WhatFPS (3,476 CPU score over 1 verified runs). The numbers are measured in 2 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | Core i5-8600K | Core i5-6400 |
|---|---|---|
| CPU score (the processor's own performance) | 5,461 | 3,476 |
| Best rig (GAMING — whole PC) | 2,908 | 2,418 |
| Integer (MT) | 3.2 Gop/s | 1.6 Gop/s |
| Single-thread (1T) | 0.47 Gop/s | 0.35 Gop/s |
| Draw calls/s (DX11) | 7,825,171 | 4,875,346 |
| Cores / threads | 6 / 6 | 4 / 4 |
| L3 cache | 9 MB | 6 MB |
What the numbers mean
The CPU score is the processor's own performance — that is what we rank on. GAMING is the whole rig's score in the best PC we measured the processor in, and leans heavily on the graphics card. A strong processor in a weak PC gets a low GAMING score without being worse. We show both and never mix them.
All numbers come from our benchmark suite: four hand-built 3D scenes written directly against the graphics APIs in Rust, the same load on every PC. The methodology is open at https://whatfps.com/metodik
All measurements for Core i5-8600K · All measurements for Core i5-6400