Summary: If you're a regular user of multimedia applications then put the Athlon 64 X2 4800+ at the top of your shopping list. It provides excellent multitasking performance and is stronger than Intel's flagship Extreme Edition 840 in some of the most popular CPU-intensive applications, such as Adobe Photoshop and Premiere.
Pros: Incredible fast and stable, high score in all benchmarks
Conclusion: The Athlon 64 X2 3800+ costs only £16 more than the Athlon 64 3800+, but is far faster in almost all our tests. If you're building a dual-core PC from scratch, Intel's Pentium D 820 is better value. However, the X2 3800+ is a great upgrade if you have a Socket 939 motherboard. The X2 4800+ is incredibly powerful, but too expensive.