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Table 3. Thermal Design Power versus Average CPU Power

Thermal Design Power (watts)

137

115

Independent and combined memory channel modes

The Quad-Core AMD Opteron processor includes two DRAM controllers that support DDR2 DIMMs.

Each DRAM controller controls one 64-bit DDR DIMM channel that connects to a series of DIMMs.

The DRAM controllers can be configured to behave as a single channel (called ganged, or

combined, mode) or as two channels (called unganged, or independent, mode). Configuring the

DRAM controllers in unganged mode creates two 64-bit logical DIMMs, each equivalent to one 64-

bit physical DIMM. Configuring the DRAM controllers in ganged mode creates one 128-bit logical

DIMM. Each physical DIMM of a 128-bit logical DIMM must be identical (same size and same

timing parameters).

The configuration requirements for the DRAM controllers and DIMMs are as follows:

• Both DRAM controllers must be programmed to the same frequency. All DIMMs must operate at

the same memory clock frequency, regardless of the channel on which they are connected.

• The DRAM controllers do not support mixing unbuffered and registered DIMMs on the same

channel or between channels.

• The DRAM controllers do not support mixing ECC and non-ECC DIMMs on the same channel

or between channels.

AMD introduced the six-core Opteron processor, formerly code-named "Istanbul," in June 2009.

According to AMD, the six-core Opteron processor (Figure 6) operates within the same power and

thermal envelope as the Quad-Core Opteron processor. However, it provides a 20% to 50%

performance increase, specifically for virtualization, database, and high-performance computing

applications. The six-core processor includes several innovations:

• A dedicated 64-KB L1 cache and 512-KB L2 cache for each core

• A 6-MB L3 cache shared among all cores

• 45 nm silicon process technology

• Support for DDR2 memory

• HyperTransport™ 3 technology

• HyperTransport (HT) Assist technology

• AMD Smart Fetch Technology

• Enhanced AMD PowerNow! with Independent Dynamic Core Technology and Dual Dynamic

Power Management

• AMD-V™ with Rapid Virtualization Indexing

Average CPU Power (watts)

105