Processors/Comparison
15 specifications
Intel Core i5-10400 vs Intel Core i5-8600
On paper, the Intel Core i5-10400 carries more L3 cache. Specifications describe what each chip is designed to do; how much of that either one holds under continuous load is a separate question.
Intel Core i5-10400
Intel · Core 10th generation · Desktop
Intel Core i5-8600
Intel · Core 8th generation · Desktop
Cores and clocks
Cache and power
Platform
A check marks the higher figure only on rows where higher is unambiguously better. Rows without one are not ties; they are specifications where “better” has no meaning.
Reading the table
What the difference means.
Cores and threads
The Core i5-10400 has 6 cores and 12 threads against 6 and 6. More threads help with work that can be split into many pieces at once: rendering, compiling, video export, running several heavy programs together. They do little for work that runs on a few threads, which includes most games and most everyday software, where the speed of one core decides the result.
Cache
The Core i5-10400 carries 12 MB of L3 cache against 9 MB. Cache is fast memory on the chip, and a larger one means the cores wait on main memory less often. Games, large spreadsheets and compiling respond to it; rendering and video export, which stream through data in order, respond much less.
Power and cooling
Both are rated at 65 W, so they ask the same of a cooler and a power supply. The rating is the heat to be moved for the chip to hold its speed; both draw above it in short bursts, and either one slows down rather than fails when the cooling falls short.
Platform
They use different sockets, FCLGA1200 and FCLGA1151, so moving from one to the other means a new motherboard. For an upgrade, that cost belongs in the comparison; for a new build, the newer platform is the one with later chips still to come.
Which to pick, on paper
- Rendering, compiling, video export
- Core i5-10400
- 12 threads against 6. Work that uses every thread scales with how many there are.
What no table says
How much of its speed a processor keeps after the first minute depends on the cooling and the power limit of the machine it is in. If you own one of these, measure it: the test is free and runs in this browser.
Questions
- Is the Core i5-10400 better than the Core i5-8600?
- By need, on the specifications: rendering, compiling, video export: the Core i5-10400. No specification says how much speed either one keeps under a long load; that depends on the cooling and the power limit of the machine it is in, and it is what a sustained test measures.
- Do the Core i5-10400 and the Core i5-8600 use the same socket?
- No. The Core i5-10400 uses FCLGA1200 and the Core i5-8600 uses FCLGA1151, so switching means a new motherboard.
- Does the Core i5-10400 or the Core i5-8600 have integrated graphics?
- Both do: Intel UHD Graphics 630 on the Core i5-10400 and Intel UHD Graphics 630 on the Core i5-8600.
More comparisons
- Intel Core i5-10400 vs Intel Core i5-10400F
- Intel Core i5-10400 vs AMD Ryzen 5 2600X
- Intel Core i5-10400 vs AMD Ryzen 5 5500
- Intel Core i5-10400 vs AMD Ryzen 5 3500 (OEM Only)
- Intel Core i5-10400 vs Intel Core i5-11400F
- Intel Core i5-8600 vs AMD Ryzen 5 3500 (OEM Only)
- Intel Core i5-8600 vs AMD Ryzen 5 1600X
- Intel Core i5-8600 vs Intel Core i5-10400F
- Intel Core i5-8600 vs AMD Ryzen 5 2600X
- Intel Core i5-8600 vs AMD Ryzen 5 5500
Every figure on this table is a design target. None of it is a measurement.
Nothing above describes how a processor behaves twenty minutes into a sustained workload, which is where two chips with nearly identical specifications routinely diverge. A boost clock is a ceiling the vendor permits, not a rate the chip sustains, and whether it holds depends on the cooling, the case, the power profile and the room. None of those appear on a specification sheet.
We deliberately do not reduce these figures to a single score. A composite invented from specifications would look authoritative and measure nothing, and choosing the weights would be choosing the winner.