I had server with old Xeon DP and Windows 2008 R2 , With hyperthreading enabled OS saw 2 CPU cores. Recently I've added second same Xeon DP , but OS steel sees 2 CPU cores. I did uninstall all cpu's as in Microsoft KB (tried reinstall also).
The situation is : Two same processors are in server.
When hyperyhreading is enabled, OS sees 1 processor (in system info
window) with 2 CPU cores (in task manager). (device manager shows 4
When HyperThreading is disabled, OS sees 2 processors (in system info windows) with 2 CPU cores (in task manager). (device manager shows 2 CPUs)
How to make Windows 2008 R2 see 4 CPU cores, with two single core hyperthreading-enabled processors ?