The new computers are the first Dell models to bring 64-bit extensions into four-Xeon servers. Intel first released the 64-bit feature, which vastly increases the amount of memory a server can use, in the Xeon model for dual-processor servers in 2004. But four-processor servers are more likely to run into the 4GB memory barrier of 32-bit processors.More info at Cnet
Dell unleashes PowerEdge 6800 and 6850 - new powerful servers

Dell released a two new powerful servers - the PowerEdge 6800 and the PowerEdge 6850. Each has four Intel 64-bit Xeon processors. The company claims these new servers deliver 32 percent more performance than their predecessors.