Comptia A+ ACPI G1S2

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I am watching Wes and Zach's Comptia A+ video series. In the Manage Devices in Windows part 1 video Wes talks about ACPI G1S2. He says that in this power state dirty cache in the CPU is flushed into RAM. Can someone please explain what this means? Does dirty cache refer to cache that has been corrupted?

@Joshua-Stewart great question, the dirty cache is just a small piece of data within the CPU cache that has been modified and at some point needs to be written back to the system memory (RAM) while the CPU moves to other calculations (performance, via the layered caching system) during normal operations. However, when the CPU is going to transition into this low powered (Sleep) state the modified data (dirty cache) needs to be written into memory because power is still being maintained on the RAM, so the OS does not lose that data. I hope this clarifies and please keep those questions coming.

Thanks, that does clear it up!