AMD is releasing two new CPUs, the Athlon 64 FX-55 and Athlon 64 4000+. Both of these chips are being released on the 939 socket platform. I'm not going to go into detail on the differences between the 939 and 754 socket platforms, if you are not aware of the difference please see Gravy's upcoming review on the 3000+ and 3200+ 90nm CPUs.

Athlon 64 FX-55

Athlon 64 4000+

As you can see, both CPUs are pretty much the same. The only main difference is the multiplier. Both CPUs run on a 200mhz FSB, with the FX-55 having a multiplier of 13x, giving it a clock speed of 2600mhz. While the 4000 has a multiplier of 12x, giving it a clock speed of 2400mhz. Now let's see how these chips are in real benchmarks.