SDI input/ouput latency

I am looking to use SDI in and out feature to input a 1080p signal from the camera, apply a simple post-process effect and send it out via SDI out. What is the minimum latency I should expect between the camera in and processed out?

Not sure if SDI is different, but with an Aja HDMI card (PCI) I typically see about 100ms (6 frames with 60hz video).