I don't see anywhere on that page any benchmark about 5000 images/sec, maybe you should update your link to a page showing that info or update your claim to match what you link to?
Even your previous post had links to two page that were not measuring the same thing... and thus could not support your claims?
Based on the text you apparently couldn't be bothered to read, for AlexNet, a forward pass on 128 images (Input 128x3x224x224) takes ~25 milliseconds (ignoring O(n) dropout and softmax where n is 128). I'll let you do the math for the rest of this...
Even your previous post had links to two page that were not measuring the same thing... and thus could not support your claims?
I think you need to clarify.