Used vs. new graphics cards

The question is really "what is the warranty worth?"

A used graphics card and a new one of the same model do the same work at the same speed. What you give up buying used is the manufacturer's warranty and the certainty of an unknown history. What you get back is a large amount of money. Deciding sensibly means putting a number on the thing you're giving up, instead of treating it as priceless.

So: what is a warranty actually worth? It covers the minority of cards that fail, mostly within the first stretch of ownership, and it pays out as a repair or replacement rather than cash. Weigh that against a used discount that is frequently a third or more of the price, and against the fact that a card which has already run for a couple of years without dying has demonstrated something a brand-new card hasn't.

Where used graphics cards win

• Last generation, mid-to-high tier. This is the sweet spot and it isn't close. A card one generation back loses a large share of its price the moment a successor launches, while losing very little of what it can actually do. The performance you get per dollar here beats anything on a shop shelf.
• Cards that were expensive when new. The bigger the launch price, the bigger the absolute saving. A flagship from two generations ago is where the largest dollar differences live.
• When you need more memory than your budget buys new. Video memory capacity is increasingly the thing that ages a card, and used is often the only way to get a lot of it without paying current-generation prices.

Where new wins

• Entry-level cards. When a card is inexpensive new, the used discount is small in absolute terms and the warranty is a larger fraction of the value. Not worth the risk for the money saved.
• Current-generation flagships. Used prices for the newest top-end cards tend to sit close to retail, because supply is thin. Paying nearly retail for no warranty is the worst of both.
• When you genuinely can't be without the machine. If a failed card means missed work, buy the warranty. That's what it's for.
• When you won't test it. The used discount is compensation for absorbing risk. If you're not going to run the tests or you have no return path, you're taking the risk without the compensation.

The comparison people get wrong

The mistake is comparing a used card to the same card new. Almost nobody's real choice is that. The real choice is between a used card one or two tiers up and a new card at your budget — and framed that way, used usually wins on performance by a wide margin. The other frequent error is anchoring to launch prices from years ago, which describe a market that no longer exists. Check what cards are actually selling for now before deciding anything.

How to de-risk the used side

Most of the gap between "used is a bargain" and "used is a gamble" is closed by three things: buy from someone who tested the card under load, insist on a return window, and test it yourself immediately. Do those and the remaining risk is small enough that the discount is close to free money. Skip them and the discount is what you're being paid to gamble.