I had hoped an HD4670 would be a useful low-power GPU for one of my smaller cases but attempts to fold on it fail almost as soon as the core loads with "Client-core communications error: ERROR 0xfffffff6". I've tried the card in two different PCs - one C2D on XP64 and one C2Q on XP32. My shortcut is "C:\Program Files\fah\gpu0\[email protected] -local -gpu 0 -verbosity 9" and I've also tried it in the second slot on the C2Q, using -GPU 1, etc. Has anyone seen anything on the offical forums about problems with the 4600 cards?