Hello to all. I've a Mac Pro from 2010. My SuperDrive is starting to fail when burning; specially dual layer DVDs. My model is a GH41N. Does anyone know, the difference between the GH41N and GH61N? I'm finding on eBay, Europe, more GH61N on sale then the GH41N. They cost a little more. Is the GH61N better? Does it have some special feature? Kind regards to all, Ferreira *One more thing. I'm thinking on upgrading the graphics card, to a GTX 980. Do I need to buy an already modified, with a Mac EFI? Is there some bios on the net, to use on a PC model? They're cheaper to buy. On eBay, already modified ones, are being sold for 1000 EUR!