Does texture size matter?

I making an iphone game. Do texture size dimensions matter? What I mean is if the atlas texture is 512x 512 and is 200kb is that better than an atlas texture thats 1024x1024 and is only 130kb. What impacts that hardware more, the texture dimensions or the actual file size?
Thanks for any help

Both, but dimensions impacts more 8). Actually it is more complex then that, but you can use it as a rule of thumb. Anyway - you can profile and see for yourself :wink: