This AMD Opteron 165 is based on the 90nm Denmark core. It one core and can run only in single-CPU systems.

Basically the only practical different between the Opteron 165 'Denmark' and Opteron 265 'Italy' is the single/dual socket configuration. The Opteron 1xx series with a Denmark core do have a higher TDP of 110W opposed to 95/68W configurations on the 2xx-series but I doubt that the 165 will ever use 110W with just 1.3/1.35V vCore. > Read more