Apparently overclocking the GPU is an instant warranty ender anyway: https://www.pcspecialist.co.uk/forums/showthread.php?3284-Warranty-When-Overclocking! I assume PCS's definition of overclocking including altering the frequencies, not just the voltage.
I'm also pretty sure that upping the clocks can increase temps even without voltage being increased, as I've seen that happen, though I share your understanding that voltage is a bigger factor.
So I ran a couple of VERY quick benches and found it overheating like mad. At first I thought it was the poor pasting job as it looked like it had been slapped on with a trowel. Some new paste (AS5) later and there was an improvement, but it was only 4 or 5 degrees.... not what I was after. Strangely I didn't receive the used tube of MX-4 so I'm wondering if it wasn't used in my build, even though I paid for it.
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AS5 in its place.
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As I said, I only got a few degrees from doing the above so I decided to check out the fan profiles. The control panel as installed stock is incredibly buggy, everything needs to be installed in the correct order or there are conflict issues that stops both the OC panel from working and XTU from installing correctly. I wiped the OS a few times though while playing so I got around all of that eventually. The Fan profiles works right off the bat though so I selected "Overclock" and everything ran great from then on. Very cool
I believe there is a disc with the drivers but I downloaded them all from the Clevo website before I started. There have been a few updates since the launch so best to get them direct.