UncleMonty:
>At first the CPU fan wouldn't spin, checked all the cables but nothing, I then moved the fan header from CPU to SysFan1 and it worked, I checked the temp in bios and it looks fine, anyone else had this problem, is it safe to use this long term ?

Go to "PC Health Status" in BIOS. Change your settings for "Smart FAN Control Method" to, perhaps, "Disable".

I had the same problem with my 120mm fans for my Scythe Ninja cooler. Starts voltage too low. There are some settings in the GigaByte utils like EasyTune to set voltage amounts and thresholds.