What's the matter if the Opterons are for servers or not? It's not like they are specialized to run only server applications..
You first have to understand what they are primarily designed for. Whether it's a Socket 939 or 940 model they are intended more for work horse builds and multitasking as well as server cases.
AMD Opteron™ Processor for Servers and Workstations
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The AMD Opteron™ processor, enabling simultaneous 32- and 64-bit computing, represents the landmark introduction of AMD64 with Direct Connect Architecture. The AMD Opteron™ processor is designed to run existing 32-bit applications with outstanding performance and offers customers a simplified migration path to 64-bit computing. This evolutionary processor provides a dramatic leap forward in compatibility, performance, investment protection, and reduced total cost of ownership (TCO). The AMD Opteron™ processor is offered in three series: the 100 series (1-way), the 200 series (Up to 2-way), and the 800 series (Up to 8-way).
AMD is continuing to drive technology leadership by introducing another computing first: multi-core technology for the x86-based computing market. Dual-core AMD Opteron processors for servers and workstations extend AMD’s Direct Connect Architecture by connecting two CPUs on one die, improving overall system performance and efficiency.
http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_8796_8804,00.html
For the X2 line,
AMD Athlon™ 64 X2 Dual-Core Processor Product Brief
Take multi-tasking to a whole new level with the AMD Athlon™ 64 X2 Dual-Core Processor.
The AMD Athlon 64 X2 Dual-Core processor puts the power of dual-core technology on the desktop. Dual-core processors contain two processing cores, residing on one chip, that perform calculations on two streams of data, thereby increasing efficiency and speed while running multiple programs and the new generation of multi-threaded software.
For the end-user this means a significant increase in response and performance when running multiple applications simultaneously. The AMD Athlon™ 64 X2 Dual-Core processor outperforms the highest-performing AMD Athlon™ 64 4000+ single-core processor on multi-tasking benchmarks by up to 30%.
http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_13041^13078,00.html
For the FX line as well as the Quad FX series,
AMD Athlon™ 64 FX Processor and AMD Quad FX Platform Product Brief
The AMD Quad FX Platform with Dual Socket Direct Connect Architecture powered by AMD Athlon 64 FX processors is the world’s ultimate PC platform for megatasking enthusiasts
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AMD Athlon™ 64 FX Processor and AMD Quad FX Platform Overview
Featuring AMD’s most advanced processor technology, AMD Athlon™ 64 FX processors are designed specifically for PC enthusiasts. AMD Athlon™ 64 FX processors enable enthusiasts to immerse themselves in their digital world. They can play games at a level previously only reserved for the world of simulations, create and manipulate digital media like a pro, and explore the possibilities of megatasking – running multiple demanding applications at once. The AMD Athlon™ 64 FX processor brings the next generation of digital media and games to life.
http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9488^9536,00.html