If your motherboard is that old, will getting a newer one work with your processor? You say a new i7 MB, I'm assuming you have an Intel chip, I'm not completely familiar with the Intel CPUs and their boards, but as far as I know the older CPUs won't work in the newer sockets. Intel is pretty bad about keeping the same socket for different CPU skews.
If you are going to go that far as to get a new MB and possibly a new CPU also, I would suggest getting a Ryzen system. You can get a B450 or B470 board and purchase a 2000 series processor now to save some money, and in a year or two, if you want, get the 12 or 16 core 3000 series once they come down in price and have a really good work PC for years. Here in the States the 2700x is under $200 right now, a 2600 for a little over $100. I have the 2600 in the computer I built and have zero complaints with it.
Once you swap your MB, you'll have to re-activate your windows again, it will lock you out if you swap that. Happened to someone else on the site, he ended up calling Microsoft tech support and they helped him reactivate it. Too many hardware changes or a change of the MB will cause windows to lock you out.
I would contact the maker of the MB and GPU first explaining what is happening and asking them if they are compatible with each other first. Does you MB meet the minimum specs for the 2080 Ti, a PCIe x 16 slot? ( see picture from 2080 Ti manual )
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