is it worth if i change the cooling kit with the Accelero Hybrid 7970 Graphics Card Cooler for Enthusiasts or should i keep the stock fan?

my pch fan spinning normally when i turn on my pc this morning but suddenly it stop spinning after 6 seconds. when i reset and check the bios setting the pch fan shows n/a. my window boot normally but the pch fan won't spin. when i turn my pc off and...