Not an expert but read the PC/laptop stuff and have built PCs from parts before, so take it FWIW ...
The i7-10700F is not as bad as the i7 12th & 13th gen on heat. I assume it was working fine with the 1660 ti and now the new 3660 ti is causing the problem with excess heat.
The G5 is a "compact" desktop so a bigger box will probably help. Maybe also a bigger fan.
The problem with a bigger box is that Dell uses proprietary motherboards & power supply. This means the placement of the holes where you screw down the original G5 motherboard may not work with the new non-Dell case.
https://www.tomshardware.com/reviews...gaming-desktop
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The Dell G5 Gaming Desktop is a compact rig that can play most games at an affordable price. It has got easily accessible ports, but a proprietary motherboard and a power supply meant for a server mean that parts beyond the RAM, CPU and GPU aren't easily upgradeable.
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1) I would suggest maybe start off by taking off some of the rear back slot panels/covers (e.g. you take them off to insert new cards).
2) Assume all the desktop and GPU fans are working? If not sure, turn it on with the cover off and you should be able to visually confirm. Also, nothing is blocking the front/back airflow?
3) I've also read some GPU cards of the same model (e.g. 3060 ti) handle heat better than others. So maybe google/read up on that specific GPU card to see if there are any complaints/solutions that others have.
4) Consider applying some thermal paste to the i7-10700F. I do believe the 3060ti is generating most of the heat, but applying paste to the CPU will probably bring down the overall temperature down
5) I don't have any experience with how well external fan solutions work, so no advice there. Maybe get a cheap "fan" and see how it goes
6) Download HWInfo, it will help you monitor the CPU & GPU temperature (e.g. when you try possible solutions)
7) Possibly consider an early birthday present and get him a newer and bigger desktop during Cyber Monday. Probably can eBay the G5 for $200-$250.
Hope this helps some.