Which other PSU do you have, apart form the OEM unit ? Also, if yours is a small form factor cabinet/SFF, then you need to change this as well, because some of the RTX GPUs are quite big in length/width. Some models might not even fit easily inside the the chassis, if there isn't enough room.I have a separate power supply just for the video card. The OEM power supply does the rest like normal. I'm wondering how well it would perform in that system since the other parts while decent for the time are 7 years old or so.