HELP!!!! msi 970 gaming motherboard

[David Millar]

i hav just recently built this system,

MSI 970
R9 280X
ONLY 4GB RAM
ARCTIC 750W
AMD VISHERA
Nothing is overclocked

During standby and when i am on YouTube etc it is fine but when i play cs go the north bridge heatsink over heats and my pc shuts down....but it doesnt do this when i play h1z1!!!

PLS SOMEONE HELP ME

 

[popatim]

I wonder if they didnt put any thermal paste on the NB heatsink but in your case it sounds like you need to add a system fan too.