Hello there - You could use the sample_multi_transcode code example to get the numbers you are looking for. This sample allows you to run multiple instances of transcode, and prints the transcode performance (in fps) at the end of the execution. That is a good way to get what you want. (You can download the samples from here - https://software.intel.com/en-us/intel-media-server-studio-support/code-samples)
From my experiments on i7-4770R, for HD resolution AVC transcodes, you should see ~12 transcodes that can happen real-time or better. Hope this helps.