OK, I have a modified-DIY-box below 70 C and running on 500 Mhz:

How do I get above 500 Mhz ?
Hi,
This may be something our engineers implement in future firmware revisions, but this is the max limit at the moment I am afraid.
Kind regards,
Med vänlig hälsning | Best regards
Kurt Radcliffe
Kncminer