DEC AlphaServer 4000
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The AlphaServer 4000 range forms a new low-cost entry level to the mid-range of the AlphaServer departmental systems. The AlphaServer 4000 systems share many of the same characteristics of the AlphaServer 4100 models. The major difference being the AlphaServer 4000 models have less CPU and memory expansion.
The AlphaServer 4000 models support 1 or 2 processors, versus the 4100s 1 to 4-way processor support. Also, the AlphaServer 4000's memory capacity is half that of the 4100s.
An AlphaServer 4000 system can be field upgraded to an AlphaServer 4100. The upgrade includes a change in the backplane to make two further system bus slots available for processors.
Alternatively, the AlphaServer 4000 can use this upgrade path to increase its I/O capacity. The two system bus slots created can also be used to connect a further two 64-bit 250MB/sec 4-slot PCI channels. This potentially gives the AlphaServer 4000 8 additional, or a total of, 16 PCI slots.
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