Rogue ISO settings

In a recent post Richandfleur included a link to a DSLR video tutorial. On ISO settings it said to avoid any multiples of 125 - i.e. 125, 250, etc as these will create noise. Anyone come across this before? Anyone know why?

It's not something I've considered much myself.
I do wonder if it's a canon specific thing or if it's comon to all?

http://petapixel.com/2011/05/02/use-iso-numbers-that-are-multiples-of-160-when-s...

It seems to relate to real ISO sensor analogue gain steps vs software simulated intermediate stops.
As above, not sure if pentax does this or not. There is another good description answer here:
http://photo.stackexchange.com/questions/43756/is-it-really-better-to-shoot-at-f...

Thanks richandfleur, to add it seems this applies to internally processed images in JPEG & video and not to RAW files.