Benchmark analysis part 1: over water. VRAM bottleneck ?

[15JG52_Brauer]

I've seen my GPUz memory load go to 1550mb over London. I did some tests myself with CPU clocks from 4.7 down to 2.66 Ghz - only saw 5fps difference (Using London Sightseeing as a test). Have not had time to do more in depth analysis) By the way, what are you using to graph the framerates - is there a tool to grab it from the in game framerate counter or are you using FRAPS benchmark and then manually creating the graphs?