Grainy noise in normal map bakes?

[Anonymous]

Hi all, first post here, Hopefully the title explains this, essentially I'm rendering out normal maps ( high poly to low transfer / render to texture ) and no matter what I try I'm getting tiny ( grainy ) noise in all the outputs, I've enabled filtering, tried MR and switched the dithering options on and off but this doesn't fix the issue, I've tried uncompressed image formats but whatever I try its still there, taking the outputs into photoshop and ramping the levels up for contrast you can see noise over the whole image, even areas that arn't used ( the background ). Any ideas or do others have this?

Image of issue attached.

Cheers