Ascertain whether the level of performance improvement from Hyper-Threading Technology for a specific application is acceptable. There is a misconception that equal performance on two workloads means equal Hyper-Threading Technology effectiveness. This doesn't give the full picture, since the amount of performance achievable is unknown.
One of the consequences of the introduction of the Hyper-Threading technology into the Intel® Xeon® processor, is that systems with Hyper-Threading technology enabled appear to the Windows* operating system to have more physical processors than are actually installed. That is because with this technology, one physical processor will be seen as two logical processors. The term logical is used here to distinguish, for example, between the two logical processors in a system with one CPU and the two CPUs in a dual physical processor.