Intel's Core i3-1215U CPUs have 2 Performance (P) cores and 4 Efficiency (E) cores for a total of 6 cores.
The P cores are comparable to previous generation cores. They support Hyper-Threading, which means they provide two threads each.
E cores are focused on adding additional threads in an energy-efficient manner. They take up much less room on the CPU and generate less heat. However, their smaller cache and minimal interconnect capabilities make them more appropriate for offloading background tasks.
The Intel Thread Director handles scheduling between the types of cores.
Running a game will primarily use P cores.
At the same time, the Intel Thread Director may offload operating system tasks and low priority periodic events to E cores.
Which Operating Systems Can Make Optimal Use of the E Cores?
The Intel Thread Director is used to help operating systems determine onto which cores to schedule work.
At least Windows 11 or Linux kernel 5.18 are required to make optimal use of the Intel Thread Director.
Linux support for the Intel Thread Director is included in version 5.18 of the kernel. Some improvements have been backported to earlier releases. Ubuntu 22.04 users can get backported performance improvements in the 5.15.35 kernel.
How Many Threads Does the 1215U Have?
Hyper-Threading is only available on Performance cores. One thread for each of the 4 Efficiency cores plus two threads for each of the 2 Performance cores results in a total of 8 threads.
Prior to Intel's 12th generation of processors, CPUs had a single base frequency and max turbo frequency. With Intel's 12 generation processors, the Efficiency and Performance cores use two individual sets of frequency values.
The 2 Performance cores have a 1.20 GHz base frequency and support a 4.40 GHz max turbo frequency.
The 4 Efficiency cores have a 0.90 GHz base frequency and support a 3.30 GHz max turbo frequency.
What Does the U Suffix in 1215U Mean?
Processor Name Suffix
"U" means it is a power-efficient mobile CPU. In other words, it is designed not to use as much power and thus not generate as much heat. These CPUs are ideal for maximizing battery life when doing low-intensity tasks. U-series CPUs use less power than both H and P-series CPUs, but also have the lowest performance.
The 1215U model name doesn't have a K or X suffix, which means that it can not be overclocked.