The NVIDIA GeForce 9500GT has a mere 314 million transistors, its core is clocked at 550MHz, offers 32 stream processors, uses 256MB (though some AIBs may go for 512MB) of 128-bit 1600MHz GDDR3 memory, and is PCI Express 2.0 based. The 9500GT is currently built on a 65nm process but eventually they'll turn to 55nm, with the current maximum power consumption being 50 Watts.
The NVIDIA GeForce 9500GT should just need a trivial PCI ID patch for support within the 2D-only xf86-video-nv driver. For the proprietary NVIDIA driver, it should already support the 9500GT otherwise it should come with the next driver update. For those NVIDIA Linux users, we are expecting a new release within a week or two.