Incidentally, does anyone know if the stock A500 PSU will struggle to run this setup, should I hack a PC psu for the job?
You should be OK, I was running my A1200 with Blizzard 1230-IV from a stock A500 PSU until recently without problem. Until it started noticeably whining and buzzing, but that was probably due to age combined with heavy use.
I would get a hacked PC PSU anyway, your A500 PSU will go the same way as mine eventually.



