sentences:  Triple-core versions (codenamed "Toliman") belong to the Phenom 8000 series and quad cores (codenamed "Agena") to the AMD Phenom X4 9000 series.The first processor in the family was released in 2007.AMD considers the quad core Phenoms to be the first "true" quad core design, as these processors are a monolithic multi-core design (all cores on the same silicon die), unlike Intel's Core 2 Quad series which are a multi-chip module (MCM) design.