The big problem with those "silver box" adapters is that they often require the use of the internal scan-doubling circuitry on the AGA chipset or use super-high-res mode. Either of those modes will suck the bandwidth out of the Chip Bus so that the graphics and sound updates will slow to a trickle. If you're running only Chip RAM then EVERYTHING will slow to a trickle. That's why a scandoubler is reccommended so highly for a classic Amiga (IF you're willing to go through with the expense).
