After several years of teasing, AMD released its Sledgehammer (K8) processors in 2003. The architecture was released first as a server variant, Opteron, in 2003. It was also AMD's first 64-bit processor. The Opteron series was updated with dual-core processors in 2005, the K10 Barcelona quad-core in 2007 and the fourth-generation Magny-Cours 8-12-core processors in 2010. The current Opteron series is based on the Bulldozer core. The processor series was instrumental for AMD in the 2005-2006 time-frame to capture market share from Intel. It was at that time when AMD had a significant performance and power consumption advantage over Intel's Netburst architecture, which, however, disappeared again when Intel released its Core architecture processors. While the original Opteron processor chiseled away market share from Intel's dominating Xeons in the x86 server segment, a decline started with the Barcelona Opteron and a damaging TLB bug that negatively impacted the credibility of the CPU. The current flagship 16-core Opteron processors with 32 nm Interlagos core are available with clock speeds ranging from 1.6 to 2.6 GHz, which is only slightly above the range of the original single-core Opterons from 2003 (1.4 - 2.4 GHz).