Dual Core logical processor?

[justin82]

I was reading thru xbitlabs' review of some workstations and ran into something interesting on this page: http://www.xbitlabs.com/articles/cpu/display/opteron-xeon-workstation_15.html

specifically this quote

The situation is pretty interesting. We can see how obviously changes the fps rate. However, it was not always the increase. In fact, the performance got faster only in those systems where we had four logical CPUs. For instance in the system built with Xeon 3.6GHz processors the results increased by 27.7%, and in the system with AMD Opteron 275 CPUs – by 25.5%.

I thought that Hyperthreading on 1 cpu would yeild 2 "logical" cpus but that dual core was essentially 2 cpus?

 

[SKy042]

I was reading thru xbitlabs' review of some workstations and ran into something interesting on this page: http://www.xbitlabs.com/articles/cpu/display/opteron-xeon-workstation_15.html

specifically this quote

I thought that Hyperthreading on 1 cpu would yeild 2 "logical" cpus but that dual core was essentially 2 cpus?

Whats the confusion?
they had dual Xeon's that would add up to 4 logical cores.