You could try building a custom PC into a hard-shell travel case. I tried that, many years ago. I'll be the first to admit I'm not especially good at working m

You could try building a custom PC into a hard-shell travel case. I tried that, many years ago. I'll be the first to admit I'm not especially good at working metal, so it was somewhat crude. Keeping everything safely in place inside, and ensuring sufficient thermal flow ended up too much of a challenge for me. The thing only ran stably when I left it open, and eventually a heatsink came loose during travel. Might be easier with today's more efficient/better designed components, and with a bit of hindsight. Still, very much a major project. I believe there are also ITX or micro ATX cases that can accommodate a 400+ watt PSU for powering a GPU in that range. Every 6-12 months I review the market on these. You can indeed get ITX cases which will take a graphics card. Generally, the form factor is the "cube" kind (well, square-ish front face), around 20x22x35cm. (~15 litres) I find this much harder to transport safely (e.g. by packing clothes around it in a suitcase) than the flat, "VCR-shaped" arrangement, with the graphics card on a 90° riser. The ones on the market also tend to waste space on optical drives, multiple hard drive bays, etc. and often have external PSUs (not necessarily a bad thing, but often they don't make the case any smaller). The Steam Machine prototypes are apparently only around 7.5x31x31cm. That's less than 8 litres, including the PSU. Last time I looked into this was in Spring, so maybe things have improved since then. Specific suggestions welcome.