Yes, buy a
decent accelerator for your A3000 and forget about the on board ram

The zip rams on an A3000 mobo is a tight fit. I'm not sure these adaptors with chips on them would fit in there. Not worth the trouble me thinks.
PS : the seller does not have a very good reputation though, so be warned. You can read more about her
here. Also her price is little bit high, you can get these boards for a little bit
cheaper if you have the patience.