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RE: Several Question for Memory Upgrade Dell 7567 and other stuff

1.  Not with Dell, but the RAM won't carry the system warranty.  Memory is user-upgradeable.  While it's possible to use mismatched RAM, matched sets will perform best.

2.  Could be virtual memory that's at fault, yes - particularly if you have a spinning hard drive rather than an SSD.

3.  That's either the fan or a hard drive - the only two things in the system with moving parts.

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