I'm tempted to buy a new case after putting the ASRock A380 in my HTPC, the 8-pin power connector comes out right where the SATA power leads come out the back of my SATA SSD. Quite an effort to get that to fit. But the MSI A380 without a power connector isn't intended for direct sale, not sure I would go for a A310 unless it was like $75, if it is closer to $100, then the A380 makes more sense (as long as you have a PCIe 8-pin. I didn't, but I got a new SFX power supply, the old one had a six-pin, but was also pushing 10 years old.
Took me a bit to get the audio working via HDMI, but after that, no complaints for general use and video playback. Tried one old DX9 title. Worked okay, but it did stutter when loading in new assets for some reason. Maybe a DX12 conversion hiccup?
Might take it apart and re-paste it or something. It is right on the threshold of being passively cooled for video playback, spins the fan about once every three minutes or so. Need to measure it and see if there are any heatsinks that might fit it better.