2C4T means dual core and four threads.
4C8T means four cores and eight threads.
that is to say, one core can be upgraded to two threads by hyper-threading technology (i.e. single core virtual dual core).
two cores can reach four threads.
four cores can reach eight threads.
you right-click the taskbar and select the performance tab in the task manager.
if there are several boxes represented by curves in the p>CPU usage record, there are several threads.