Two new processors hit the market with the launch of the AMD Athlon FX-55 and the AMD Athlon 64 4000+. Two new processors that offer 32-bit/64-bit capabilities, leading-edge performance, Cool'n'Quiet technology and Enhanced Virus Protection. AMD says their new Athlon 64 FX-55 is the world's best pc processor. Period. The Athlon 64 4000+ is Leading Performance for today and tomorrow's software.