I use Omega drivers from my 4750. However with the lastest drivers both modded and un modded, it is best that you make sure you've had removed all your previous vid card drivers using a progam called 'driver cleaner'. Then make sure you download and install framework v1.1 (microsoft update stuff, 100% safe). If your installing the Omega's like I have, make sure you install them and click the 'fastwrites' option to ON (Not NO, ON, no typo there
When you remove vid card drivers, first uninstall them, then use the driver cleaner to take out the rest of the files, reboot and then install the new ones!