Simply put: something is only worth what someone is willing to pay for it. No matter the item and regardless of what it is appraised for or what ‘book value’ says it is worth, it boils down to what someone can actually sell it for.
A great way to find out what virtually anything is worth is by using eBay’s completed listings tool. By using a typical keyword search, you can see all the applicable listings in the past 15 days which includes both items that sold and those that did not, as well as the final price. While this method certainly isn’t the ‘be all’, it is a very easy way to get an idea of what you could sell or buy something for.
The completed listings search on eBay requires you to have an account, but this is negligible compared to the value this tool offers.

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A year and a half ago, I made enough to upgrade from an Athlon XP computer to an Athlon 64 x2 computer with decent specs, by searching for what the various parts of my desktop were worth and sold them along with some other parts for good money. It’s worth seeing what you have, and what people are willing to pay!
I did the same. Sold all my Socket 939 gear and replaced it with Core 2 Duo gear for a net cost of ~150. More than quadrupled the speed of my computer.