The one that I just purchased from China runs great. But it does not show up at all in Windows 8.1. When I look at the pc specs it just says that it has the old T9400 CPU in it. Also the same in the device manager. I assume that it would do this with any version of Windows or pc, because these are a sample series and are therefor not from the official intel production line. So it did not pass the SPBC test with the intel processor diagnostic tool. But that just means that it is a sample CPU. Other than that it runs great! No issues. It does clearly show up in the CPUZ program as the X9100 CPU.
Bought this to repair and upgrade an older laptop and, it's worked wonders. A laptop processor is NOT easy to install except on certain units. Generally though, it's a complete disassembly of the laptop. Anyway, the processor works great and has dramatically improved the life of the laptop.