I did not buy the Vapor -X 5770, however I do Have 1 XFX 5770 and 1 Sapphire 5770, using cat 10.2 having no issues on either card so far. I also have 1 His 5770 in a separate machine on Win7 no issues. I believe that if you are still having issues the general consensus is that its a bad card and to RMA it. If you haven't taken the plunge yet, go for it. The card is a good one.
Has Ati come up with a gpu acceleration feature for encoding yet? It seems that Catalyst 10.2 has a beta feature for drag and drop WinDVD, but it says that it is only for dual core chips. Does this mean that this will not work if you have a quad core. This is an important topic for me as this compputer's main task will be as a HTPC and i will be doing lots of encoding of DVD's onto my HDD. Elemental has a program call Badaboom that uses Nvidia cards to offload some of the encoding pressure onto a more capable GPU. I would prefer ATI and the new 5000 series, but this is a big advantage for Nvidia.