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The design of Digital's NVAX
CPU chip provided the opportunity to bring RISC-class performance
to deskside CISC VAX computer systems. The VAX 4000 Model 400, 500,
and 600 low-end systems took full advantage of the performance capabilities
of the NVAX microprocessor. The three systems offered from two to
four times the performance of the previous top-of-the-line VAX 4000
Model 300 system in the same deskside enclosure.
To achieve this increased
performance, Digital's systems engineers designed a new high-performance
memory controller chip as part of
the CPU module, whose basic design was shared by the three
systems. In addition, a high-performance memory module and a VLSI
bus adapter
chip were designed. |
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VAX 4000 Model 500 Specifications
| Relative Performance x VAX-11/780 (1 MIP) |
24.0 |
| Technology |
CMOS |
| In-cabinet CPU Upgrade Kit |
N/A |
| Number of Processors |
1 |
| Maximum Vector Processors Supported |
N/A |
| Peak Vector Performance per Processor |
N/A |
| Maximum Memory Support |
512 MB |
| Maximum Disk Capacity |
42 GB |
| VAXcluster I/O Servers |
N/A |
| Maximum I/O Throughput |
8 MB/s (1 DSSI)
3.3 MB/s (Q-bus) |
| Bus Type |
4 DSSI
2 Q-bus |
| LAN Support |
Standard |
| Ethernet Adapters |
Up to 3 |
| CI VAXcluster System Support |
N/A |
| DSSI VAXcluster System Support |
Optional |
| Ethernet VAXcluster System Support |
Optional |
| FDDI VAXcluster Support |
N/A |
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Open VMS |
| Floating Point Accelerator |
Standard |
| Floating Point Data Types |
F, D, G, H |
| Cache Size |
10 KB on chip
128 KB on board |
| Cycle Time |
14 ns |
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