Cpu

[Sohamiam]

Why Cpus have double the threads not the triple .Like r7 3700x has 6 core 12 threads not 36 threads ?

[GDRRiley]

that would be squared not trippled

6x2=12

6x3=18

[Snowarch]

im not a pro on the subject but threads themselves is the idea of a program using one core as if it were a cirtain amount. if it was tripple one would need to act as 3 requireming more power and some speed. but only some programs even support that many threads so it isnt that common juat more exceppensive to be tripple in most cases.

[BobVonBob]

There actually are chips out there with more threads per core, Intel has a collection of Xeon chips that run 4 threads per core. The reason consumer chips don't go above 2 though is because n way multithreading more or less splits a core into n parts. The n cores, the real core and the multithreaded ones, will share some parts of their processing path but can work on different things simultaneously. However because of this the virtual cores are not a direct replacement for a real one. The more spread out the multithreading, as in 4 way multithreading, the less powerful each virtual core is, to the point where more than 2 way is impractical for consumer applications.

[GoldenLag]

25 minutes ago, Sohamiam said:

Why Cpus have double the threads not the triple

because on a consumer plattform the gains are minimal. unlike certain server applications. 

 

not that is cant be done. we have 4-way SMT on certain PowerPC CPUs and on Xeon Phi. 

 

it also costs some diespace to implement. 

 

28 minutes ago, Sohamiam said:

.Like r7 3700x has 6 core 12 threads not 36 threads ?

that would be 6-way SMT.......

[Pickles von Brine]

Generally you are going to work with groups of numbers divisable by 2. 3 is a strange number to work with in computing. There are likely other reasons too. Maybe floating point unit for example. 256 is a lot easier to devide by 2, 4, 8 etc than by 3. 

They make processors that are 2 thread per core (most of us use them), 4 threads per core (IBM's Power 7) and 8 threads per core (IBM Power 8).  You can have odd number of cores, that is physical.