AMD A10 7890k

[EsPaulPo]

I have an AMD A10 7890k processor, on the amd page it says it has 4 cores and 4 threads, but in the task manager it shows me 2 cores and 4 threads. In the CPU-Z program it shows me 4 cores and 4 threads.
I already formatted a clean version of windows, but the problem persist.

When I installed the processor, in windows appeared 1 core and 2 threads, I went to the BIOS and had an option that said "2 cores per processor", the disable menu and the start of windows seems to me 2 cores and 4 threads. Also in the BIOS shows me the 4 cores in operation.

Why does this happen ?. Is Windows really using the 4 or only 2?
I need to solve the problem, thank you very much.

Specifications of my CPU:
Mainboard: Gigabyte g1 sniper a88x.
BIOS version: F11
Processor: AMD A10 7890k
RAM: kingston hyperx 4gb ddr3

NOTE: The images are referential, this is what happens with my processor.