You know, these performance differences between any driver releases may sound good if you look at the % value. But in real life, it usually manifests as 0,00002344 fps gain. Nothing you can notice in any way except for synthetic benchmarks.
I usually install every new driver release including betas, but not because of performance gains, only I like to do it.
The only situation where updating all the time can be important if you run linux. Those drivers are so terrible that every single update matters.
CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition, Lubuntu 13.04
CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Lubuntu 12.04