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To all crypto miners who still believe in gpu mining is there anyone using RTX4090 already for mining? What hashrate are you getting off the graphic card and which coin is the most friendly for mining on the RTX4090, also I need information on watt consumption and heat, this is urgent, I will drop more information later.

Is this information not enough for you?
https://whattomine.com/gpus/79-nvidia-geforce-rtx-4090?cost=0.1&cost_currency=USD
Maybe you can get a little better power consumption, but this video card has the same problems as the RTX 3090. And then you will have the dilemma: making expensive cooling or opening warranty seals and changing thermal pads with thermal paste.

you know my 3090ti cards have cool memory numbers I have 4 from evga all of them have ram in the 76-86c range with 300- 305 watts

https://www.evga.com/products/product.aspx?pn=24G-P5-4983-KR

look at the two 3090ti in open air rig below

I understand that you have chosen good video cards with a good cooling system, but not everyone is so lucky.
My colleagues have problems with these graphics cards and have been forced to deal with overheating issues. I have a lot of cheap open cases and don't want to spend money on closed cases or extra ventilation.

that card has a massive cooler(uses a lot of metal), the card is still new but if the thermal pads can't last long, it has to be changed with quality thermal pads.

there are cards that have low quality coolers even with good thermal pads, the temps are a bit good enough but not excellent.

cards with better coolers are a bit more expensive, but sometimes it is worth it.

First problem:
EVGA, a titan in the PC component space, is getting out of the graphics card game. The company posted in its community forum, saying that it wont be making next-generation Nvidia graphics cards but will continue to sell and support the existing current generation products. According to Gamers Nexus, the company doesnt currently have plans to make AMD or Intel graphics cards.
https://www.theverge.com/2022/9/16/23357031/evga-nvidia-graphics-cards-stops-making

The second problem is in return on investment and in relation to profit with possible problems.