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General rule of thumb on year, make, model, and specs of computers/modems/routers/DVR/Tablets/PCI cards, and anything else inside determining to sell it rather than scrap it?

Suggestions and "what would you do?", in this manner.

Much love

depends on the market you are at

I guess you're from USA, and would prefer to sell most stuff locally - so take a look at your craigslist and go from there, I myself, would not individually try to sell any items that go less than 10 $, per item - even more on e-bay (15-20$ per sale)

the more complicated the item (for example individual RAM vs complete laptop) the higher the cut-off, due to more work involved in testing/higher failure risk

I suggest you assume what is your time worth to you and go from there, you'll learn quick enough in practice

For me, my market - for example, for CPUs I don't bother for anything less than i-series - i5 and even i3 sells OK locally... 500 gb is the cutoff for HDD, 400w for PSU, 2 gb for RAM - but it is all specific to my local market...

Just do a quick research on your local marketplaces/e-bay what sells & compare it to the expected hassle that goes with it, and that will be your answer...

All add my experience as well
Selling?
Computers, 1982-1995——after 2015
Laptops, before 2000——after that flip a coin
Modems, external always——internal with on them
Router, almost always. Not for much but better than scrap
DVRs: see notes below
Tablets, Samsung, Apple, Microsoft. Good luck with anything else
PCI, too much to discuss here.

Computers: anything before 1982-1985 should be opened. The difference between scrap and sales value is impossible to tell from outside for most people. That time frame could easily give you high telco and gold caps that far out value the sales price of whole systems

And unfortunately I just got interrupted so I’ll be back. I

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.

... and we’re back.
Laptops run all over the price range. But: anything newer than the mid 2000s is an absolute pain to scrap so best to try selling them first.

Modems are a rare breed now. The marketplace has pushed them out so like floppy drives watch as their prices continue to climb. External modems are already averaging over $20 with slower, lower bit rate ones being more expensive than faster ones.

Very few routers pass the level of junk scrap. Peripheral at best for the majority. So if you can sell it do so.

DVRs aren’t all that popular because they’re usually locked up in bender restrictions. PVRs (personal) and SVRs (security) on the other hand will fetch $50 to many thousands. Generically DVR tends to refer to something for recording encrypted video without decryption.
The other two are after market/ consumer market devices that will record anything that can be plugged into it.

Tablets: big brands sell. Everything else is junk for resale $50 new tablets have $5 resale value. Or less.

Expansion cards are all over the spectrum from pennies to thousands.

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-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.