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The Cyrix 486DX Processor
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The Cyrix Cx486DX was designed to be completely software-compatible with Intel's i486DX processor. It is not just an Intel clone but a completely new design by Cyrix. Compared to the i486DX the Cx486DX had an improved cache algorithm and therefore was faster in specific applications. The price for a Cx486DX was a little lower than for Intel's 486DX and made the processor a very common i486DX alternative.
References:
Cyrix 486DX2/DX4 Processor FAQs
Cyrix 486DX2/DX4 Processor Brief
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