The temps are between 70-80 when I play games, I have a H510 caseYou can make fan curves in MSI Afterburner or whatever software goes with your unspecified brand of GPU. It would be unusual for a 1650 to run that hot considering it's a very low power GPU; what are you defining as hot? Specifics are always useful and there's a lot of information missing from your post (temperatures, brand, case/case configuration, ambient temperature).
As for other people's fan curves, they're not useful person-to-person. While GPUs are the same, situations are not. A suitable fan curve for someone using an RTX 3080 in a small form factor case in a hot environment is going to be very different from an RTX 3080 in a large airy case with good airflow in an air-conditioned room. It's something that can only properly be done by the person at their computer, through experimentation and testing to find a good balance of noise and cooling.
80C is not hot for a video card.The temps are between 70-80 when I play games, I have a H510 case
Ye, also I have a AIO radiator in the front, so would that affect my gpu thermals?Those temperatures aren't notably high for a GPU being stressed, though they are a bit on the hot side. Is this an H510 with a solid front panel? Those have pretty lousy thermal performance.
Should I change the fan configuration at the back of the case? Top and rear are outtake so should I flip one of them?Yes ! having a solid front panel along with a radiator in the front increases case temperatures.
The small amount of air coming in the front is then mixed with recirculated warm case air and blown through the radiator. Here it picks up heat from the CPU and is blown inside the case.
Now your video card is being cooled by warm air instead of cool outside air.
Some cases are built for looks and others are built for performance.
Very few cases excel at both.