Why do we need cache memory if random access memory (RAM) also uses transistors? Can everything be done with a single kind of memory?

Principles of Information Systems (MindTap Course List)
13th Edition
ISBN:9781305971776
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter3: Hardware And Mobile Devices
Section: Chapter Questions
Problem 6SAT: LI is the fastest type of cache memory built into a computer, faster even than DDR4 SDRAM memory....
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Why do we need cache memory if random access memory (RAM) also uses transistors? Can everything be done with a single kind of memory?

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