which graphic driver is best for dell latitude d630

hello,

For Dell latitude d360 the best graphics Driver to use is official driver certified by Dell

Intel GM965 Express Chipset Family, v.6.14.10.5076, A07

nVidia Quadro NVS 135M, v.179.68 XP32, A07 Dell ISV certified driver

DownloadLink:
http://www.dell.com/support/home/us/en/04/product-support/product/latitude-d630/drivers/advanced

And also You can Use 3rd party applications for 3d accleration and optimization for games to run smoothly

1: Game booster
http://www.razerzone.com/cortex/game-booster