Hi all, I have an amiga 500 equipped with an icd adspeed, and jumpered with a physical switch. .
I have one, with the switch, in a floppy-based A1000 with fastram; as someone pointed out, the switch has to be changed at least at warm boot, maybe at cold boot. The performance boost is very noticeable with it switched on - you won't need SysInfo or anything else just to see if it's activated!