Hi

I have tried overclocking my PC to 4.6 and 4.7. With both I have stressed tested using Aida64, real bench and Asus pc diagnostics with all results being positive.

However the issue I'm having is occasionally when booting/restarting the PC and always when using the Asus direct to bios app, I get the error code 64. The computer hangs until I power off. But when I power back on its fine.

It seems strange to me that it passes all stress tests but there's a problem with booting.

My motherboard is ASUS Maximus Hero VII and I have the i7 4790k.

The voltage I used was adaptive. at 4.6GHz I used 1.28v and 1.31v for 4.7.

Thanks for reading my post, any advice is appreciated.