The guys from DailyTech had the opportunity to run a quick test on a quad-core AMD Barcelona PC at Computex:
We only had a few minutes to test the chip, but we were able to run a quick Cinebench before we were instructed to leave.
The AMD benchmark ran on a single-socket, K10 CPU running at 1.6 GHz on NVIDIA's nForce Professional 3400 chipset. According to the system properties, the AMD system used 4GB of DDR2-667.
The most similar Intel system we could muster up on such short notice was an Intel Xeon 3220. The Xeon X3220 is clocked at 2.4 GHz, and ran on Intel's Garlow workstation chipset (Intel X38). This system property profile stated the system utilized 4GB of DDR2-800.
Cinebench completed the default benchmark in 27 seconds for the 1.6 GHz K10; 17 seconds for the Intel Xeon X3220. The Kentsfield Xeon was 58% faster with a 50% higher clock frequency for Cinebench.