Unhappy Audio/video playback stuttering : do I need an exorcism ?


Hello all,

I'm encountering a very strange problem these days...
I have 3 identical builds (3770K, UD5H, GTX660Ti, 32go VengeanceLP, Samsung840 SSD, etc) for multimedia postproduction.

A few days ago I discovered that one of them is stuttering really bad when reading a video file or even a simple WAV audio file stored on the main SSD.
The stuttering is random and frequent (every 2-3 seconds on average).

My two other builds are working perfectly, reading the same files.

What I tried :
- swapping my boot disk with one from a healthy machine : problem still here.
- swapping the GPU with one from a healthy machine : problem still here.
- swapping all the RAMs with some from a healthy machine : problem still here.
- flashed the BIOS with a BIOS from a healthy machine : problem still here.
- unplugging everything (USB, internal drive, etc) except the keyboard, one screen and the boot SSD : problem still here.

I'm a bit lost : does a faulty MoBo or CPU can cause playback stuttering ?

By the way, the unhealthy machine scores 16000 on Geekbench and 1000 on Luxmark, which is consistent with my healthy ones.

Ideas anyone ?

Thanks !