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You could also have shorter cycles times by just doing it and assuming it'll be fine. Acorn's Master Turbo uses 4864-2 DRAMs, which have a 150 ns access time/270 ns cycle time, for, I think, a max throughput of 1e9/270=3,703,703 bytes/sec - but the Master Turbo's 65c02 CPU runs at 4 MHz, and therefore requires 4,000,000 bytes/sec. And, somehow, it works...

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That is probably similar to how you could use both sides of a single sided floppy. Both sides were tested and the factory ended up with a huge pile of floppies that passed both sides and a small pile that failed one side (and some that failed both sides and were discarded). The market wanted more single sided disks so they simply moved a number of floppies from the first pile to the second. That meant that you mostly likely got a double sided product when you paid for a single sided one. But it was a risk.

Same thing of processor and memory speed bins.

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