There is link to single benchmark in the big thread, but I have to say that is some low quality benchmarking... doesn't really tell anything.
Looks like it doesn't provide much improvement compared to the Noctua, but I have some doubts as the heatsinks are bigger and it has more heatpipes.
I would personally give preference to the Silver Arrow as well. You can mount additional fan easily using brackets or some home-made magic :- ). The default is so loud because it's 3000RPM fan, while Noctua uses 1500RPM. You can even replace the fans with the same combo that NH-D15 is using, by adding one Noctua Sterrox 120mm fan.