The performance impact makes this a no-go for graphics drivers. Lots of games are 32 bits, even recent ones, because they don't need the large address space and

The performance impact makes this a no-go for graphics drivers. Lots of games are 32 bits, even recent ones, because they don't need the large address space and don't want to pay the overhead of 64 bits. Really, this is an incredibly stupid move that has a high likelihood of killing Linux gaming on Ubuntu.