I've build this Windows 7 64-bit with Atom-15 and GroovyMAME (version 0.16x or so) a few years ago. It all sits inside a Sega New Astro City connected to the 29" arcade monitor using JPAC for controls. Everything works perfectly fine (using HyperSpin). I can jump around games, play for a few hours, and shutdown cleanly.
I did notice that if I let the game attract screen play (with no input from user) after a while, the screen gets all garbled up. It's almost like it lost vertical hold. Picture is dimmer, and looks duplicated/split top/bottom. I exit from game to HyperSpin and it continues. I power down the entire arcade machine, reboot, and everything back to normal. I recall this once happened before even inside of HyperSpin.
A few years ago the monitor had all its caps replaced, and it doesn't do this with real arcade PCBs.
I'm not sure what it is .. and I'll probably just ignore it. Wondering if maybe it's something that was "known" and fixed in newer versions of GroovyMAME and any of the other software?