Sable CPU Module Specification
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Sable CPU Module Specification

Sable CPU Module Specification Sable CPU Module Specification

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CHAPTER 2 CPU MODULE VARIATIONS This specification describes CPU modules that are based on the DECchip 21064 and DECchip 21064-A275 CPU chips. The module differ with respect to on-chip cache size, backup cache size, operational speed, number of system CPU’s supported and form factor. This chapter attempts to define the physical and functional design differences between the Alpha-based processor modules. Table 1 lists the different CPU modules. Table 1: CPU Modules Variations Option Number CPU/ I/D cache Chip-Size Frequency Cycle Time Bcache Size Cache Access B2020-AA DECchip 21064 8K/8K 190 MHZ 5.26 ns 1 MByte 26.3 ns 4 B2024-AA DECchip 21064-A275 16K/16K 275 MHZ 3.64 ns 4 MByte 25.45 ns 4 2.1 Form Factors CPUs Supported The processor modules measure approximately 340.6 mm x 228.6 mm and use hidensity connectors. The Figure 4. form factor for the CPU module is shown in CPU Module Variations 7

Copyright © 1993 Digital Equipment Corporation. Figure 4: CPU Form Factors 8 CPU Module Variations Power MCA 340.6 mm (13.410") Power 228.6 mm (9.000") CPU_CARD.DOC PS @ 100%

Copyright © 1993 Digital Equipment Corporation.<br />

Figure 4: <strong>CPU</strong> Form Factors<br />

8 <strong>CPU</strong> <strong>Module</strong> Variations<br />

Power MCA<br />

340.6 mm (13.410")<br />

Power<br />

228.6 mm (9.000")<br />

<strong>CPU</strong>_CARD.DOC<br />

PS @ 100%

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