Hello,
I built my system about four years ago and put a new mobo, CPU, and GPU into it earlier this summer.
The principal components:
Gigabyte B85M-D3H mobo
Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz, 3601 Mhz, 4 Core(s), 8 Logical Processor(s)
Geforce GTX 970
The upgrades went reasonably...