While Barcelona is a quad-core server processor, AMD also has the quad-core Agena FX processor for high-end gaming PCs. Both processors will be based on AMD's new K10 architecture and will be presented to the press on April 23rd and 24th in Tunisia.
Here's some info about the K10 and Agena FX, coming from a slide from AMD over at FUD Zilla:
AMD K10 architecture details:
Native quad-core design
512KB L2 cache per core
Shared 2MB L3 cache
Enhanced AMD PowerNow Technology
AMD Virtualization (AMD-V)
Performance per watt leader
AMD Agena FX details:
Fastest gaming processor
Up to eight cores with AMD Quad FX
Best performance with ATI CrossFire
Perfect fit with AMD RD790
We don't have the proof yet but if we can believe AMD the Agena FX processor will be able to take back the performance crown from Intel.
Another part that will be presented to the press in Tunisia is the new RD790 chipset. This chip supports eight-cores with a Quad FX system, CrossFire and some other neat things.