Both my 3080s can do 102MH @ 214W.@Gameface What's your break down these days by each graphics card. I'm ready to upgrade my computer anyways. I figure mining might influence which graphics card I get. I'm thinking I should just run double 3080s since I think it's cheaper than a 3090. But I guess if the 3090 can make a lot of money and then I'll buy a second later when they get cheaper.
My 3090 can do 122MH @ 324W
I'm about to add a 3070 which is supposed to be able to do 61MH @ 160W
The 3060 Ti can do the same hash rate as the 3070 but @ 120W. This is the card most miners would want if they had their choice.
The primary factor in hash rate is VRAM bus size and speed. Actual GPU chip performance is not as important.
For casual mining power consumption isn't much of a big deal. It's also not a big deal as a cost issue because it accounts for such a small percentage compared to earnings. What is an issue is heat and power delivery. The wattage used directly correlates to the amount of heat the device is producing, so it's harder to cool higher wattage cards and the space they are in will get hotter as well. In a larger multi-GPU "farm" there is an issue with how to power the GPUs. Starting with the typical PC power supply, 6 cards can be too much, especially if each one is over 200W. Multiple power supplies can be used and/or server power supplies can be used. But in a farm with several rigs the available power from the wall will start to be a factor. Not to mention the very real possibility of starting a fire if you're exceeding the specifications of wiring (especially if daisy chaining and splitting power plugs).
I would take 2 3080s over a single 3090 for sure. But keep in mind that there is no SLI on 3080s, so 2 will not give you improvements in games. SLI is not a factor for mining as the software will use multiple cards just fine without an SLI connection.
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