HP 124708-001 1850 Introduction Manual - Page 14

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The four-core Intel Xeon 7300 series processor (Tigerton) consists of two dual-core silicon chips on a

single ceramic module, similar to the Xeon 5300 series processors. Each pair of cores shares a L2

cache; up to 4 MB of L2 cache can be allocated to one core. Intel states the Xeon 7300 series

processors offer more than twice the performance and more than three times the performance-per-watt

of the previous generation 7100 series, which is based on the NetBurst microarchitecture. Xeon 7300

series processors are empowered by the Intel® 7300 Chipset, which features Dedicated High-Speed

Interconnects (DHSI). DHSI is an independent point-to-point interface between the chipset and each

processor that provides full front side bus bandwidth to each processor (Figure 9). The point-to-point

interface significantly reduces data traffic and provides lower latencies and greater available

bandwidth. The chipset also features a 64-MB snoop filter that manages data coherency across

processors, eliminating unnecessary snoops and boosting available bandwidth.

Figure 9. Intel Xeon 7300 series processors with the Intel 7300 Chipset and Dedicated High-Speed Interconnects

Based on the 45nm Penryn core, the 6-core Dunnington processor is the successor to Tigerton and has

a 16MB L3 "last level cache."

Enhanced SpeedStep® Technology

Four-core Intel Xeon 5300 and 7300 series processors support Enhanced Intel SpeedStep

Technology. These processors have power state hardware registers that are available (exposed) to

allow IT organizations to control the processor's performance and power consumption. These

capabilities are implemented through Intel's Enhanced Intel SpeedStep Technology and demand-

based switching. With the appropriate ROM firmware or operating system interface, programmers

can use the exposed hardware registers to switch a processor between different performance states,

or P-states

, at different power consumption levels. For example, HP developed a power management

feature called HP Power Regulator that uses P-state registers to control processor power use and

performance. These capabilities have become increasingly important for power and cooling

management in high-density data centers. With the combination of this technology and data-center

management tools such as Insight Power Manager, IT organizations have more control over the

power consumption of all the servers in the data center.

The ACPI body defines P-states as processor performance states. For Intel and AMD processors, a P-state is

defined by a fixed operating frequency and voltage.