guys OCing an i7 2600k on a MSI Z68MA-ED55 mainboard, cooling it with a H50 dual fan push-pull setup

pushing it at 4.2MHz and the CPU temperature went up to 74-81c at full load. is that normal? stressing it wit prime95 for about 5min and couldn't bare to continue looking at the temperature, had to stop it right away.

some advice on cooling or maybe a better oc settings? mainly use for rendering



thanks guys