For my geforce 6800 card i opted to go with aftermarket cooling because under load the stock cooler sounded like a helicopter. Stock kept temps around 58degrees celcius gpu and 38 ambient temperature; with stock cooling and overclocking on the gpu i was able to hit over 90 degrees celcius on the gpu, now thats too hot for comfort even though the limit is 127 degrees celcius (27 degrees hotter than boiling water). I slapped on a Artic Cooling NV Silencer 5 for 6800 gpus with the provided generic white paste and it dropped my temps to 48 degrees idle on the gpu and never over 60 on load and most importantly its silent.