Total PC freeze after 3-5 minutes when playing BF3 & BF4 with a buzz noise.

@FrostyTDN, cheers and no problem. Have you tried playing on other maps and game modes and do you do anything specific around the 3 minute mark? I can't really think of much else to try, as you have done it all, you could try to do a clean boot (as it maybe you have some programs causing problems)

To Clean Boot Your PC,

1) Press Win+R
2) Type 'msconfig.' in the prompt and hit enter
3) When Msconfig opens select 'General'
4) Choose Selective Startup option.
5) Uncheck 'Load startup items box'
6) Open the 'Services tab' then select 'Hide all Microsoft services' Option at the bottom of the tab
7) Press 'Disable All' Button
8) When prompted restart.

If no luck there, open BF4 and task manager and monitor the 'Processes' Tab for sudden spike, do this by sorting via CPU.

Thanks