The board itself isn't that useful on its own. It'll run in a 5400 or 6x00 enclosure (it should run in any of them, even the 630/580, without much trouble) but typically you won't have a reason or desire to unless your x400/x500 board fails.
The MPEG and Video boards are really going to be suitable for other 5000 and 6000 series systems. They might also work on the 630/580, but the 580 supports a lot fewer of these options than anything else in the series, too.
If you bring the system home, the 5200/5300 (except the 5260 specifically) have all the same internal guts as the 5400, so you'll get 832x624 out of the "fairly good" picture tube, at which point it makes sense to use the 5200 board until you've got something you like better or until you need part out of it to feed a system you like more.
The MPEG and Video boards are really going to be suitable for other 5000 and 6000 series systems. They might also work on the 630/580, but the 580 supports a lot fewer of these options than anything else in the series, too.
If you bring the system home, the 5200/5300 (except the 5260 specifically) have all the same internal guts as the 5400, so you'll get 832x624 out of the "fairly good" picture tube, at which point it makes sense to use the 5200 board until you've got something you like better or until you need part out of it to feed a system you like more.