Number of CPU with dual/quad core technology.

Dear Gurus!

Our Hardware supplier recommend to use 1-Quad cpu for SRM 5 and 2-Quad cpu from ECC 6 in production environment.

My question - can the multhicore technology be replacement of physical CPU?

Can 1 dual-core replace 2 CPU?

Can 1 quad-core replace 4 CPU?

IS there SAP official information about this issue?

Regards

Vladimir