AMD K7 microprocessor family

AMD Duron 1000 - DHD1000AMT1B

Starting from Duron 1GHz all Duron processors had new core that was based on Athlon Palomino core. This core added data prefetch mechanism and support for SSE instructions. These features helped to improve performance of Duron Morgan processors in SSE-enabled and memory-intensive applications, making the Morgan core on average a few percent faster than the Spitfire core. Still, this performance gain was not sufficient to beat equally clocked Athlon Thunderbird processor (which didn't have data-prefetch and SSE instructions).

AMD Sempron 3000+ - SDA3000DUT4D (SDA3000BOX)

K7 Semprons are essentially re-branded Athlon XP microprocessors. Sempron CPUs have the same core, L2 cache size and mostly the same front side bus frequency options as Athlon XP CPUs, though Semprons don't support 400 MHz FSB, and their maximum internal frequency is limited to 2000 MHz as opposed to 2200 MHz for Athlon XPs. Because Sempron processors are aimed at the same market as Intel Celerons, all Semprons have Celeron rating, which is approximately 300 MHz higher than Pentium 4 rating. As a result, the fastest officially released Sempron 3000+ only performs as fast as Athlon XP 2700+.