Processors/Comparison
15 specifications
Intel Core i7-1255U vs Intel Core i7-12650H
On paper, the Intel Core i7-12650H 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 i7-1255U
Intel · Alder Lake-U (12th Gen Core) · Laptop
Intel Core i7-12650H
Intel · Alder Lake-H (12th Gen Core) · Laptop
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 i7-12650H has 10 cores and 16 threads against 10 and 12. 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 i7-12650H carries 24 MB of L3 cache against 12 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
The Core i7-12650H is rated at 45 W against 15 W. The rating is the heat the cooler has to move for the chip to hold its speed, and modern chips draw well above it in short bursts. In a laptop the maker chooses the real limit inside a range, so the same chip can behave like two different processors in two machines. That spread is what a sustained test measures and a specification sheet cannot. A chip whose cooling falls short does not fail. It slows down, and it does so after the first minute, which is why short benchmarks miss it.
Platform
Laptop processors are soldered to the board, so this is a choice between machines, not between chips you can swap. What differs between two laptops with these parts is mostly the power limit and the cooling the maker gave each one.
Which to pick, on paper
- Rendering, compiling, video export
- Core i7-12650H
- 16 threads against 12. Work that uses every thread scales with how many there are.
- A quiet or compact build
- Core i7-1255U
- 15 W against 45 W: less heat to move, so a smaller cooler and slower fans.
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 i7-1255U better than the Core i7-12650H?
- By need, on the specifications: rendering, compiling, video export: the Core i7-12650H; a quiet or compact build: the Core i7-1255U. 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 i7-1255U and the Core i7-12650H use the same socket?
- Laptop processors are soldered in place, so neither can be swapped for the other.
- Does the Core i7-1255U or the Core i7-12650H have integrated graphics?
- Both do: Intel Iris Xe Graphics (96 EU) on the Core i7-1255U and Intel UHD Graphics for 12th Gen Intel Processors (64 EU) on the Core i7-12650H.
- Which runs hotter, the Core i7-1255U or the Core i7-12650H?
- The Core i7-12650H is rated at 45 W against 15 W, so it produces more heat under load and needs the larger cooler. How hot either one actually runs depends on the cooler and the case more than on the chip.
More comparisons
- Intel Core i7-1255U vs AMD Ryzen AI Max 385
- Intel Core i7-1255U vs Intel Core i5-1235U
- Intel Core i7-1255U vs Intel Core i5-14450HX
- Intel Core i7-1255U vs AMD Ryzen 9 270
- Intel Core i7-1255U vs AMD Ryzen 9 7940HS
- Intel Core i7-1255U vs AMD Ryzen 9 8945HS
- Intel Core i7-12650H vs Intel Core i5-14450HX
- Intel Core i7-12650H vs Intel Core i7-13620H
- Intel Core i7-12650H vs AMD Ryzen AI 9 365
- Intel Core i7-12650H vs AMD Ryzen AI 9 465
- Intel Core i7-12650H vs AMD Ryzen AI Max 385
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.