8640 8640 N/B MN/B Maaintenanceintenance
512KB, Level 2 Advanced Transfer Cache:
The Level 2 Advanced Transfer Cache (ATC) is 512KB in size and delivers a much higher data throughput
channel between the Level 2 cache and the processor core. The Advanced Transfer Cache consists of a 256-bit
(32-byte) interface that transfers data on each core clock.
As a result, the SFF Desktop Pentium 4 processor 1.6 GHz can deliver a data transfer rate of 4.8 GB/s.
This compares to a transfer rate of 16 GB/s on the Pentium III processor at 1 GHz. Features of the
ATC include:
-- Non-Blocking, full speed, on-die Level 2 cache
-- 256-bit data bus to the level 2 cache
-- Data clocked into and out of the cache every clock cycle
Advanced Dynamic Execution:
The Advanced Dynamic Execution engine is a very deep, out-of-order speculative execution engine that keeps the
execution units executing instructions. The Pentium 4 processor can also view 126 instructions in flight and handle
up to 48 loads and 24 stores in the pipeline. It also includes an enhanced branch prediction algorithm that has the
net effect of reducing the number of branch mis-predictions by about 33% over the P6 generation processor?s
branch prediction capability. It does this by implementing a 4KB branch target buffer that stores more detail on the
history of past branches, as well as by implementing a more advanced branch prediction algorithm.
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ACEC
