AMD Radeon HD Drivers Update

I recently clean installed Mavericks, greatly improving general performance.

I have Imac 27 Jule2011 with AMD Radeon HD6970M. Im using Windows 7 64 bit.But new games require newest version of driver for videocard.I tried install ATI CATALYST and install new video drivers, but it is impossible, cuz i have apple architecture of hardware.Last version of bootcamp(5.0.33) have old version of driver (12.8).

However, I noticed render times in Adobe After Effects had slowed down greatly so took a look at my CUDA preferences. I found that the CUDA driver was up to date, but the GPU driver read "Driver Version: no version found" (see image below).

I've had a search to find the correct version through AMD but have found nothing so far /

Any help would be greatly appreciated, done as much Googling as I can but found nothing so far :/ all i can only find is ways to update amd drivers in windows 10 only.