I believe it’s all caps.
http://international.download.nvidia.com/partnerforce-us/Bra...
http://international.download.nvidia.com/partnerforce-us/Bra...
> "From the mid 90s to early-mid 2000s, stylized as nVIDIA with a large italicized lowercase "n" on products. Now officially written as NVIDIA, and stylized in the logo as nVIDIA with the lowercase "n" the same height as the uppercase "VIDIA".