I had the same card back in the day and made a big difference to my Amiga experience, Demos looked great with no frame drop, Doom was a pleasure to play, tinkered a little with NetBSD and even managed a bit of browsing with some IRC and mp3 playing... but I did find some compatibility problems with a lot of older titles, shutting the caches off sometimes helped. The chips run rather hot even at stock speed as they use a higher voltage (5V if I remember correct) and I had to leave the trapdoor cover off. They are double clocked so you will need to bear that in mind if overclocking with regards to which crystal to use... as already mentioned it is currently running at 28mhz which is pretty much the limit for this chip as overclocking these arent in the same league as say an older pentium where you just bung on a bigger heatsink n fan and ramp it up... you could attempt 33mhz but you may start to experience stabilty problems.
