How to search a string in the whole RAM? (not only in some processes' allocated memory, but the whole RAM)

Or is there a way to dump the whole RAM into a 4GB or 8GB disk file? Then I could easily do:

```
grep mypassword c:\ramdump.raw

```

Usage example: I'd like to know if a password manager **stores my master password in plaintext**, as [found by a security team here](https://www.zdnet.com/article/critical-vulnerabilities-uncovered-in-popular-password-managers/).

I'm using Windows 7 x64, as administrator.

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Note: Unlike [How to get complete memory dump in Windows 10?](https://superuser.com/questions/1023640/how-to-get-complete-memory-dump-in-windows-10) I specifically want to search content in the RAM, and not get information *from* a memory dump. Moreover this question is unclear: the title doesn't match the content ("Question in title doesn't seem to match the question in the body.")