more render targets vs. one MRT

[arnir]

Hi
I am making my deferred render above standard irrlicht render. I got the classic scheme of 2 render targets:
first for normals and depth
the second for albedo and specular
then into the third texture I render point lights as spheres and in final compose shader, I combine all these textures into the final image. Now I got around 65fps.

When I started I want to keep things simple so I draw scene two times. Once to obtain depth and normals, once to get albedo. But then I learn about multi render targets where I can draw scene only once, but output more informations into more textures. So Ive switched into this approach, I was expecting some performance boost because there is twice less overheat then in the first approach, but I got 60fps.

My question is: is it possible or mrt has to be faster and there has to be bug?

[Nadro]

MRTs should be definitly faster, which texture format do you use for RT?