I love my NUC Extreme compute element for my gaming rig. It performs extremely well, and my whole rig is the size of two full size graphics cards side by side,

I love my NUC Extreme compute element for my gaming rig. It performs extremely well, and my whole rig is the size of two full size graphics cards side by side, so it'd fit into a shoe box. The board is also very customizable -- I can scale down to ~3.0 ghz x8 for nearly silent operation, or up to ~4.5 Ghz before thermal throttling takes over. Plenty of timing, voltage, and thermal options. On a more spacious case with better circulation, I'm sure it'd go higher. I got this case for it: https://www.newegg.com/white-cooler-master-mastercase-nc100-small-form-factor/p/N82E16811119409 https://www.newegg.com/white-cooler-master-mastercase-nc100-... but my experience with coolermaster customer support was not great.