Also the processor marking indicates that the total L2 cache size is 512KB. In other words, Athlon 64 X2 3600+ is the first and so far the only AMD CPU featuring 256KB of L2 cache per core. From this prospective, it could have been also called Sempron X2, at least there are single-core Sempron processors with 256KB L2 cache in AMD’s product line-up. However, AMD is going to officially introduce dual-core Sempron processors only when they switch to 65nm mass production in 2007. Therefore, in the meanwhile the new processor that turns out very similar to the dual-core Sempron will be selling under the “Athlon 64 X2” brand name.