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Alpha 21464 µarch
General Info
Arch Type	CPU
Designer	Compaq
Manufacturer	IBM
Process	0.13 µm
Core Configs	1
Pipeline
Type	Superscalar
OoOE	Yes
Speculative	Yes
Reg Renaming	Yes
Stages	8
Decode	8-way
Instructions
ISA	Alpha
Cache
L1I Cache	64 KiB/core 4-way set associative
L1D Cache	64 KiB/core 4-way set associative
L2 Cache	3 MiB/core 6-way set associative
Succession
Alpha 21364

Alpha 21464 was an ambitious Alpha microarchitecture designed by Compaq as a successor to the Alpha 21364 set to be introduced in 2004. The project was cancelled in June 2001 when Compaq announced their commitment to Intel's Itanium.

History

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Process Technology

See also: 0.13 µm process

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Architecture

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Area comparison

In a talk by Joel Emer, it was stated that, at ISO process, the 21464 is roughly 4.5 times larger than the 21264 and is over 6 times larger than the original 21064.

Die

• 1.2 GHz - 2 GHz @ ~1.2 V
• 0.13 µm process
• ~250,000,000 transistors
• ~420 mm² die size
• PGA-??? package
  • ~1100 signal pins

Floorplan was done but the design never made it to fabrication.

Documents

• The Alpha 21364 and 21464 Microprocessors: Continuing the Performance Lead Beyond Y2K (PPT) (PDF Version)

References

• Seznec, André, et al. "Design tradeoffs for the Alpha EV8 conditional branch predictor." Computer Architecture, 2002. Proceedings. 29th Annual International Symposium on. IEEE, 2002.