What is Multiple CPUs, Cores, and Hyper-Threading

The central processing unit (CPU) in your pc does the computational work as running program, basically. However fashionable CPU’s supply option like multiple cores and Hyper-threading. Some PC’s even use multiple CPU’s. We’re here to assist kind it all out.

The clock speed for a CPU accustomed be enough once comparing performance. Things aren’t so easy any longer. A central processing unit that provides multiple cores or Hyper-threading might perform considerably higher than a single-core computer hardware of the identical speed that doesn’t feature hyper-threading. And PCs with multiple CPUs will have a fair larger advantage. All of those options are designed to permit PCs to additional simply run multiple processes at the identical time—increasing your performance once multitasking or under the strain of powerful apps like video encoders and trendy games. So, let’s take a glance at every one of those options and what they could mean to you.


Hyper-threading was Intel’s 1st try and bring parallel computation to shopper PC’s. It debuted on desktop CPU’s with the Pentium four HT back in 2002. The Pentium 4’s of the day featured simply a single processor core, therefore it might very solely perform one task at a time, even if it absolutely was ready to switch between tasks quickly enough that it appeared like multitasking. Hyper-threading tried to form up for that.

multiple CPU's

A single physical central processing unit core with hyper-threading seems as 2 logical CPUs to an OS. The central processing unit continues to be one central processing unit, thus it’s a tough little bit of a cheat. while the OS sees 2 CPUs for every core, the particular central processing unit hardware solely incorporates a single set of execution resources for every core. The central processing unit pretends it’s a lot of cores than it will, and it uses its own logic to hurry up program execution. In different words, the OS is tricked into seeing 2 central processing units for every actual CPU core.

Hyper-threading permits the 2 logical central processor cores to share physical execution resources. This could speed things up somewhat—if one virtual central processor is stalled and waiting, the opposite virtual central processor will borrow its execution resources. Hyper-threading will facilitate speed your system up, however, it’s obscurity close to nearly as good as having actual extra cores.

Thankfully, hyper-threading is currently a “bonus.” whereas the first client processors with hyper-threading solely had one core that masqueraded as multiple cores, trendy Intel CPUs currently have each multiple cores and hyper-threading technology. Your dual-core central processor with hyper-threading seems as four cores to your OS, whereas your quad-core central processor with hyper-threading seems as eight cores. Hyper-threading isn’t any substitute for added cores, however, a dual-core central processor with hyper-threading ought to perform higher than a dual-core central processor without hyper-threading.

Multiple Cores

Originally, CPUs had one core. That meant the physical central processing unit had one central processing unit there on. to extend performance, makers add further “cores,” or central process units. A dual-core central processing unit has 2 central processing units, therefore it seems to the OS as 2 CPUs. A processor with 2 cores, for instance, may run 2 completely different processes at the identical time. This races your system, as a result of your PC will do multiple things without delay.

Unlike hyper-threading, there are not any tricks here — a dual-core central processing unit virtually has 2 central processing units on the hardware chip. A quad-core central processor has four central processing units, associate octa-core  CPU has eight central processing units, and so on.

This helps dramatically improve performance whereas keeping the physical hardware unit tiny thus it fits during a single socket. There solely must be one CPU  socket with one CPU unit inserted into it—not four totally different CPU sockets with four different CPUs, every needing their own power, cooling, and different hardware. There’s less latency as a result of the cores will communicate a lot of quickly, as they’re all on the identical chip.

Windows’ Task Manager shows this fairly well. Here, as an example, you’ll see that the system has one actual central processing unit (socket) and 4 cores. Hyperthreading makes every core seem like 2 CPUs to the OS, thus it shows eight logical processors.

multiple CPU's

Multiple CPUs

Most computers only have one central processing unit. That single central processing unit could have multiple cores or hyper-threading technology, but it’s still only 1 physical central processing unit inserted into one CPU socket on the motherboard.

multiple CPU's

Before hyper-threading and multi-core CPUs came over, people tried to add further process power to computers by adding extra CPUs. This needs a motherboard with multiple processor sockets. The motherboard additionally wants the extra hardware to attach those processor sockets to the RAM and alternative resources. There’s lots of overhead during this kind of setup. There’s further latency if the CPUs have to communicate with one another, systems with multiple CPUs consume a lot of power, and therefore the motherboard wants a lot of sockets and hardware.

Systems with multiple CPUs aren’t quite common among home-user PCs nowadays. Even a high-powered gaming desktop with multiple graphics cards can typically only have one C.P.U. You’ll notice multiple C.P.U. systems among supercomputers, servers, and similar high-end systems that require the maximum amount number-crunching power as they will get.