We have taken the San Diego core Athlon 64 FX55 and taken it up to 3.6GHz with the Prometia cooler. We test all the way up to 3.4GHz with benchmarks all the way from the 3000+ Venice to the 4800+ dual core, and FX speeds equivalent to FX57, FX59, FX61, and FX63.
AMD quietly updated the FX55 to a San Diego core a couple of months ago. With this core an improved 90nm process, SSE3, and tweaks to the memory controller were added. We quickly tested the overclocking ability of this new FX with high end air. We were able to reach 3.1GHz, but had to fall back to 3GHz for benchmarking. Now we add another tool to our overclocking arsenal as we utilize the Prometia Mach II phase change cooler to bring the CPU down to negative 40 degrees Celsius. Our goal is to push the CPU to new heights, and get the highest clock benchmarks we can. Read more at AMDZone