I'm very out of the loop. Do the sound cards do a better job than what's integrated into modern motherboards, or is there another reason for the revived interest in them?
Hackaday
Fresh hacks every day
There's different sound voices for older games based on which sound card you have. The music sounds completely different between some of them.
Case in point-Thexder on the Tandy vs anything else
When sound cards first became integrated there was a lot of discussion about the quality being worse because of interference coming from the motherboard. I'm not sure if that has been overcome or is even possible to.
I had an ISA sound blaster 64 and stuck with it a good while (until those slots disappeared) but honestly could never tell the difference in quality when I switched to integrated.
Yes, considerably. Integrated sound cards have to deal with a lot of interference coming from the different components on the board, which raises the noise floor. If you ever heard a high pitched whine in your headphones while the PC is doing something, that's interference from the CPU. It's much more noticeable if you have high-end headphones that require amplification; the amp will make the interference very obvious. But you might still hear it if you crank your OS's volume too.
For this reason, external USB-C sound cards (also called DACs in certain circles) are preferred among enthusiasts and audiophiles. It's a lot more difficult for interference to reach a device that is outside of the PC. I have one and the difference is night and day.