Both of them are not released by NEC official until now.
I got one ND-4650A in China and burned discs properly. :bigsmile: :bigsmile: :bigsmile:
It was tested compatible with nForce4 series but not compatible with nForce2 series. Intel and VIA chipsets had not been tested.
The firmware of my ND-4650A is 1.02 RPC-2 with DVD+R9 bitsetting only.