Slightly lower benchmarks with multi-monitors enabled?

[futurefields]

When I first installed my 970 I was getting in the 1450's on Unigine Heaven 4.0 now I'm getting in the 1430's and the only thing different is I have my HDTV enabled as a secondary monitor for Steam Big Picture.

Anybody else experienced similar degradation in performance with these cards?

 

[Ayah]

more stuff to render = less spare computing power for benchmark.
I run 3 monitors and in general I have to have lower settings than someone with a single monitor could get away with