It's not an uncommon thing for GPU and CPU fans to start at full speed, but you don't see in all systems. Actually, I don't see it in any of my current systems, but I had i5 3570k that did that (probably had more to do with the motherboard than the CPU).
Normally it will do it for 1 second and then slow down. If it stays at a higher speed all the way through boot, then it sounds like your fan speed is controlled (overridden) by software rather than set by hardware.