GPU that was used for mining
There are different types of loads that are being applied to the GPU. Take Furmark and Unigine Heaven for example. Both push the GPU to 100% utilization, but Furmark is way more dangerous and taxing. Unigine Heaven is like gaming, and Furmark is like mining.
Let me try and explain this with an analogy:
When you are gaming, changes are going on in the game, your GPU is basically using "adaptive mode" similar to your CPU to ramp up and down as the game calls for it. Depending on the action, or lack thereof that is going on in game, the GPU adapts to that scenario. It isn't going to use excessive amounts of power on a loading screen, or a cut scene, or something non-demanding. When something demanding does happen, then the GPU will ramp up to meet that demand. It is most definitely not always running at 100% utilization.
Think of a Nascar or Formula One Race, imagine the car as your GPU. When you are racing, your car is always adapting to the situation around you. You speed up, you slow down, you turn, you pit stop, things are going on that your car has to adapt to similar to your GPU when you game.
Now, what Furmark does is not like a game, or a Nascar race. Furmark is like a drag race. A pedal to the metal, push the car/GPU as hard as it can possibly go in a straight line, no turning, no stopping, just full on, all out go, go, GO! In a realistic scenario of GPU use, you would never, ever encounter this type of load. It is entirely unrealistic.
Mining with your GPU is a full on drag race, non-stop 100% utilization, max power draw, excessive heat, etc.. Its brutal. It shortens the lifespan of the GPU and degrades the circuitry and components. It is not a good idea to buy a GPU that was used for mining, unless it is under manufacturer's warranty, and even then, I would still be careful.
Buy a used GPU all you want, just don't buy a GPU that was used for mining. It is two completely different types of applications and amounts of stress. Mining is a non-stop drag race, gaming is a nascar race. Read the analogy above.
You also don't know how much mining has been done. For mining to be profitable(not really), those cards need to be running full tilt, 24/7 for months, maybe even a year non-stop. That is way too much unknown, and way too much risk for me to personally swallow or recommend anyone else take the plunge on.
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