The 825 is most likely the 1.1 GHZ version of the Power4. Here is the processor description: The POWER4 has a unified L2 cache, divided into three equal parts. Each has its own independent L2 controller which can feed 32 bytes of data per cycle.[clarification needed] The Core Interface Unit (CIU) connects each L2 controller to either the data cache or instruction cache in either of the two processors. The Non-Cacheable (NC) Unit is responsible for handling instruction serializing functions and performing any noncacheable operations in the storage topology. There is an L3 cache controller, but the actual memory is off-chip. The GX bus controller controls I/O device communications, and there are two 4-byte wide GX buses, one incoming and the other outgoing. The Fabric Controller is the master controller for the network of buses, controlling communications for both L1/L2 controllers, communications between POWER4 chips {4-way, 8-way, 16-way, 32-way} and POWER4 MCM’s. Trace-and-Debug, used for First Failure Data Capture, is provided. There is also a Built In Self Test function (BIST) and Performance Monitoring Unit (PMU). Power-on reset (POR) is supported. The FC on the 825 indicates an Enterprise Edition so it is most likely a multiple processor system. Do wrkhdwrsc *PROC to determine the number of processors installed. Because you see them doesn't mean they are all activated. This is a single core processor. The 820 and 720 are both Basic Editions so they are probably the 450MHZ and 250MHZ versions of single core 64bit processors. These are pretty old models and IBM doesn't keep old system information available to the using public. These probably aren't the answers you really want, but IBM does not rate it processors the same way AMD and Intel do. The AS400 processors have more data coprocessors and on board cache so they can handle much bigger workloads than the others in most cases. You are talking about $2,000-$20,000 chips vs. $100 to $2000 chips.

The 825 is most likely the 1.1 GHZ version of the Power4. Here is the processor description: The POWER4 has a unified L2 cache, divided into three equal parts. Each has its own independent L2 controller which can feed 32 bytes of data per cycle.[clarification needed] The Core Interface Unit (CIU) connects each L2 controller to either the data cache or instruction cache in either of the two processors. The Non-Cacheable (NC) Unit is responsible for handling instruction serializing functions and performing any noncacheable operations in the storage topology. There is an L3 cache controller, but the actual memory is off-chip. The GX bus controller controls I/O device communications, and there are two 4-byte wide GX buses, one incoming and the other outgoing. The Fabric Controller is the master controller for the network of buses, controlling communications for both L1/L2 controllers, communications between POWER4 chips {4-way, 8-way, 16-way, 32-way} and POWER4 MCM’s. Trace-and-Debug, used for First Failure Data Capture, is provided. There is also a Built In Self Test function (BIST) and Performance Monitoring Unit (PMU). Power-on reset (POR) is supported. The FC on the 825 indicates an Enterprise Edition so it is most likely a multiple processor system. Do wrkhdwrsc *PROC to determine the number of processors installed. Because you see them doesn't mean they are all activated. This is a single core processor. The 820 and 720 are both Basic Editions so they are probably the 450MHZ and 250MHZ versions of single core 64bit processors. These are pretty old models and IBM doesn't keep old system information available to the using public. These probably aren't the answers you really want, but IBM does not rate it processors the same way AMD and Intel do. The AS400 processors have more data coprocessors and on board cache so they can handle much bigger workloads than the others in most cases. You are talking about $2,000-$20,000 chips vs. $100 to $2000 chips.