7.1 vs 5.1
7.1 has two extra speakers.
5.1:
1 center channel speaker directly ahead.
2 front speakers, left and right, usually either side of the center channel.
2 rear speakers, left and right. As far back as you can put it.
1 subwoofer.
7.1 adds two more speakers directly to the right and left of the observer. So basically, 6 speakers surrounding you, with an additional directly in front of you.
7.1 is obviously better for the full surround experience, assuming your source audio supports 7.1. But it adds 2 more speakers, so the cost of it may not be worth the extra benefit. 5.1 or even 2.1 is probably decent enough for gaming. And then there's virtual surround which uses software to simulate the additional speakers. There's also sound bars, which uses more creative methods of simulating surround sound (2.1, 5.1, etc) with usually a single speaker directly ahead of you.

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