Your motherboard is a 6150K8MA series. You are quite right it; says winfast C51GK8MA in CPU-Z and indeed it says Winfast on the board. Foxconn must be their retail wing or some such. Anyway I threw my the box my mobo came in away some time back and had to resort to viewing reviews that cited both names in the end.
Once I saw the mobo number i rembebered it and am certain it is correct.
the link you need is
here
Good luck