True fast RAM almost doubles the speed on any Amiga, even without CPU upgrades.
An A4000 runs OK with the (infamous) A3640, and will fly with any other 040 with memory, even those who runs at meres 25MHz!!!
On a humble A600, even PCMCIA SRAM improves the speed by a 30% rate (1.3x the original speed). Don't expect this behaviour on a 1200! The 1200 crawl with a PCMCIA SRAM only as RAM expansion.
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