Cannot use more than 2 optical drives simultaneously, CPU or motherboard bottleneck

DrowElf

Commendable
Jun 9, 2016
1
0
1,510
A friend of mine had a custom PC built and cannot use all of his optical drives simultaneously. I think it is the CPU, but this is outside my wheelhouse so I really don't know. He is using MakeMKV to rip DVDs but when he tries more than 2, it fails. What exactly is the bottleneck? He has asked me to build him a new computer, but until I know the problem, I will not proceed.

Relevant specs:
CPU: Intel i-7 4770k
GPU: GTX 960
Motherboard: z97-a
Optical drives: Blu-Ray Rewriter WH14NS40 x4