Hello S Ulmer,
If the Processor Identification Utility Tool is telling you that all 4 cores are enable, but in the other hand all other software such as CPU-Z, Speccy and the task manager on Windows are seeing only 3 cores, 6 threads. This issue could be related to the operating system.
These are some recommendations for this issue
- Download and run the following Intel software named Processor Diagnostics Tool. https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=19792&lang=eng&OSVersion=Windows%207%20(64-bit)*&DownloadType=Utilities%2C%20Tools%20and%20Examples
- You may want to do BIOS updated on your computer.
- Do a clean installation of the operating system.
If the problem persisted I recommend you to get in contact with the laptop manufacture for any additional assistance.
No need to try out your recommendations.
The problem was solved by Pierre Romani http://communities.intel.com/message/192265#192265 :
click on start button, type msconfig in the search bar, then press Enter, then go to start, advanced options and uncheck the number of processors and memory limit.
Thanks a million, Pierre.
Not only did this simple procedure bring back the 4th core of my i7-3610QM processor, but it also enabled the turbo boost function which did not work before.