08-03-2010 09:56 AM
hyperthreading is only available in the Pentium 4 and Core i series CPU, but not the Core Duo or Core 2 Duo processors in the R61e thinkpads.
08-03-2010 10:48 AM
08-03-2010 01:18 PM
08-03-2010 02:00 PM
08-03-2010 11:46 PM
I think it just saves power don't really know
Sometimes one of the core is faulty, turning off one core helps you to isolate that faulty core. Also, some applications have compatibility issues with multicore processors.