i have my 2500k clocked to 4.2ghz with an antec kuhler h2o 620 using a lian li fan at full-on (very quiet still) 
running prime95 my temps cap at 68*c, but it eventually drops slightly
and sits at about 65*c
i'm using the stock compound that was on the kuhler, but i will change to arctic silver 5 sometime soon(ish)

running prime95 my temps cap at 68*c, but it eventually drops slightly

i'm using the stock compound that was on the kuhler, but i will change to arctic silver 5 sometime soon(ish)