Andrej,
If you are taking 4,000 pixels per line, then the line rate will depend on the kind of image you are taking, also make sure it is a CameraLink Base Configuration compatible camera. The top speed of CameraLink Base is 255 MegaBytes per second, so for instance if you take 8bit grayscale images it would be 255MB divided by (4,000*8) which is around 63,700 lines per second. If you have a 16bit image it would be around 32,000 and a 32 bit color image would be approximately 16,000 lines per second. Let me know if you have any more questions, thank you!
-Allison S.
Calibration Services
Product Support Engineer