AY>  In many recent advertisements I have seen both "486DX-50" and "486DX
AY>based systems. Does the first really exists and does it imply that all
AY>circuitry on the motherboard with it works at that speed, as opposite 
AY>latter, where only the internals of the CPU are working at 50MHz?
AY>
AY> Many thanx in advance!
AY>
AY>Andrew.

Andrew, yes there is a DX and DX2 version of the 50MHz 486.  If you are 
considering buying one or the other, definitely go for the DX with a nice 
size external cache!  The performance is far greater.

The DX2 only has the internal 8k cache to work with at 50MHz, while the DX 
has a potentially much larger cache to work at 50MHz with.  Neither 
systems could actually run a program out of main memory, since DRAM is 
still too slow for that high of bus speed ( 60ns = 16.66MHz < 50MHz ).

-rdd

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