Hi, > I use Windows 8 64bit. Should I install the patch as well? Or is it specific AMD cards only? I would only apply the patch if you notice the following problem: I use agryllcms in combination with dispcalGUI. DispcalGUI showed BEFORE the patch: Gamut coverage about 70% for AdobeRGB. So I only applied the patch after only getting 70% AdobeRGB gamut coverage. However on m system AFTER applying the patch I get above 90% AdobeRGB Gamut coverage. I had the same issue (with 70% vs. 90% ) under Mac OSX 10.8 on the same machine. Applying the patch under Mac OSX and Win 7 solved the problem und both OS. But if you do not notice any problems you do not need the patch under either OS. Best regards Alex