AMD A10-5800K Overlock Questions

So my friend recently overclocked his AMD A10-5800K with the default heatsink and fan. He overclocked at 4.6GHz per core, and is now reaching temps of 90 Celsius. Is this a good temperature, or should he get an aftermarket cooler? Thanks. Oh, and he's using this PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

Here's his build. http://pcpartpicker.com/p/ELuV

He should definetely get an aftermarket cooler, temps that high dont immediatley ruin thye cpu, but they do shorten the lifespan quite a bit. I usually aim for temps no higher than 70 degrees just under 80 is acceptable, but not recommended. 

 

Also, which bloody idiot overclocks to that speed on a stock fan!?!

Definitely get an aftermarket cooler. 90 is way too hot in my opinion. I would try to keep it below 65 if possible. My A8 5600k @4.4Ghz is running at 40c idle and around 60-65 under heavy load.

Alright, thanks.