90 degree temp on CPU

Hi guys. my new i7-4790k is running really hot in-game with the stock cooler. do i need to upgrade my cooler and if so, can you suggest one that will fit that it at good price... im skint at the minute.

| +- CPU Core #1 : 43 41 85 (/intelcpu/0/temperature/0)
| +- CPU Core #2 : 46 43 89 (/intelcpu/0/temperature/1)
| +- CPU Core #3 : 44 43 86 (/intelcpu/0/temperature/2)
| +- CPU Core #4 : 42 42 80 (/intelcpu/0/temperature/3)
| +- CPU Package : 46 44 90 (/intelcpu/0/temperature/4)


Many thanks