Second-hand parts

What kind of things should I look out for when buying second-hand computer parts? I've got a build in mind but it's overstepping my budget a bit and I figure I could save money with a good deal on a used GPU and/or CPU, but I'm worried about buying a hunk of junk that'll self-destruct in a couple months' time. How do I best avoid this?

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Use your local sales sites.
Buy from respectable sellers. Specially ones who have their ID tied to their account.

There isn't much else then, if they seem to know their shit, aren't a literar nobody on the site and say it's good, it's usually good. You always at least get a "guaranty of working" warranty too.
Otherwise if you buy from shady ad's and literar nobodies, it's a gamble and there's not much to favor your odds.

Depends on what your building gaming parts from gamers is a bad idear if you ask just check the return policy and read all negative reviews

Thanks for the advice. What about prior usage? How much is too much, and does it matter what kind?

Buy from communities of enthusiasts , notably those using heatware dot com. Heatware is an old school, free site for reviews that was developed as a way to be able to buy/sell/trade among enthusiast hardware forums and communities.

I wouldn't know how to check maybe a benchmark but yah you can find a CPU that has been worked to death but it's not common.

Stress test it after you get it. If it doesn't pass, return it.
Otherwise, there's no real way to tell.

IDK what your budget is but if the $250 1660 Ti is out of budget, then the entire budget must be around $500. In that case a used CPU, and GPU are pretty much necessary.

i work in an RMA dept for a small company that puts together high-end systems.

the most common component failures, in order are:

GPU
Power Supply
Motherboard

i suggest staying away from those if there are no warranties attached

Huh? The picture wasn't related to anything, I just googled a random graphics card so that I could post the thread. I'm after an RX 570. I'm a bong but my budget would be around $650 I think
So a CPU would be relatively low-risk, then?