Not the actual topic, but why would one get an X58 board and a low-end GPU???
I was given the CPU...I mostly plan to use the computer for running machine learning algorithms and a distributed computing project (Rosetta@Home). Fast GPU not needed...yet.
@jaguarskx, thanks for the links. It does look like the 5000 series consumes less power at idle than the 4000 series. Actually, it looks comparable to integrated graphics at idle.