Computer making weird buzzing noises

Not sure if this is the right forum, Mods feel free to move it to the right forum!

Hey.

Been having this problem lately;

I play World of Warcraft as a raider(3 times a week) and during said raids, my computer randomly makes a buzzing sound and shakes my table a bit, they can be quite frequent and some nights I don't get them at all. I play other games(like Battlefield 3) and I never experience this issue, WoW seems to be the only game that makes this issue occur.

During said "raids", my CPU is around 60% usage(game only utilizes 2 cores) and GPU at 10-20%. What could be causing this issue? I've ran Prime95 for an hour now and haven't had any issues and Battlefield 3 is a GPU heavy game so it can't be the GPU?

Specs:
i5-2500k @ 4.3 GHz
ASUS GTX 580 DirectCU II
Kingston HyperX 2x 4GB 1333MHz
ASUS P8P67 WS Revolution
OCZ Agility 3 120GB SSD(OS)
WD Caviar Black 1TB(Games/big programs)
Corsair 750W 750TX
CM Storm Enforcer(case)

Thanks!