I'm aware of the 5V and 12V variants; there's also PWM and analog for both voltages to watch out for. Seems to agree with 4884's assessment. Should be fun to test. I was thinking about this more recently, and I was wondering if perpendicular fins might actually be more useful for cooling the VRM's, although the RAM would still be a nuisance. Hopefully sealing the intake and maybe squeezing in some 40mm could still ensure the hot air gets out reasonably efficiently with that setup. Yeah, "best performance and temps possible" might end up being a spectrum though, depending on what kind of temps you can live with under load. Open-air cards might perform better but make everything hotter. More testing will help. USB doesn't natively carry video, but doesn't USB-C, or can it only do one of power and video but not both at the same time? The Eleduino display should work over just USB-C but it requires both that and HDMI, unfortunately. Still looks like the best option though. Thanks for all the input!