My defective cube continues to degrade. 2 more DC/DC down as of an hour ago, for a total of 4 defective DC/DC on the same cube. Just sent a request to RMA the cube.
I received one defective cube as well. 3 of 4 DC/DC down. The cube hashes at about 7Mh/s in bfgminer. The other three cubes are working flawlessly around 75Mh/s each.
It seems as if this problem is widespread. Do you think KnC has manufactured numerous cubes and shipped 3 winners and 1 loser to each of their customers?
I think they have DC/DC subsystem, SPI bus and controller performance issues they don't want to talk about. Problems in these areas would account for virtually all of the reported problems with the Titan. There is a 50/50 chance that they are hardware issues, which would account for the apparent production halt.