4090s are actually selling for $1,700 - $2,100
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It doesn't matter if people list their 4090 for $2,500 - $3,500. No one is actually paying that much, which makes sense given you can just buy a professional class card at that price point with 48GB of VRAM.
So yeah, let's assume you sell your card for $1,800 (the average for used cards). eBay charges you 248 bucks in fees plus another $60 in shipping cost (you can go lower uninsured if you are foolish and wish to risk loosing all your money).
That leaves you with $1,492, which is less than what you'll pay to buy the card. So you sold your card, lost some money, and now you don't have a video card and are likely going to have to pay scalper pricing to get a 5090.
Seems like a net negative to me but then again I actually use my 4090 for work. I suspect people who can do this and go months without a 4090 really don't need that 5090 either.
I don't see the 4090 dropping 30% off it's $1,600 MSRP. That would place it around $1,120 USD. That's possibly around or below 5080 pricing and with how cut down the 5080 is, the 4090 may well still be faster. Rumors have the 5080 with only 16GB of VRAM as well, which will kill it's appeal to the AI market (which is huge).
We may well be looking at a 2000 series scenario again where the 2080 was slower and had less VRAM than the 1080 Ti at a similar price.
Add the cost of gas money and wasted time waiting in line to the above calculations as well. I would never do this for a video card that's only going to be used for gaming but then again I could never justify that kind of price for gaming alone either. No game is worth the $2,000+ the 5090 is going to cost, period.
Yeah, it's not a good price. Plus you have to be extra careful with these large cards, cracking of the PCB is much more common near the pins because people didn't properly support them. It's not always obvious either. The internal layers of the PCB could be damaged and cause a whole host of issues when you are outside your return period. I'm typically an advocate for purchasing used GPUs but not when there's the possibility of a product having non-visible damage you can't test for.