A test is limited to 1024 clients which is (despite aversion to the term webscale) not a lot, even on an Intranet.
I would say if you are not testing 10kcc you are not pushing the difference between nginx and apache1.3
As soon as you do push 10kcc, kernel tcp buffers and the amount of junk in your browser http headers start to be more import than server perf. Just in the amount of data coming into the nic.
