Drivers 9 series Linux

Good night!
my card is nvidia 9800gt
I would like to know if will have more updates to 9 series driver …
or if already aingiu 100% of the performance …
Kubuntu 14:04 TT
Thank you

The latest compatible driver for your card is 340.64. The 340 branch will be supported until 2019 to stay compatible with future Linux kernel releases and Xorg ABIs and to fix bugs. No features will be added.
The NVIDIA drivers are at OpenGL performance parity with Windows, since 310 anyway. Since then there haven’t been any substantial performance improvements since they are as good as they’ll get.