Try the gtx 660ti with the i3-8100 first after upgrading psu.  If gaming performance is ok then you are all set.  They are a good match as shown below.  For better fps consider a faster video card.  the i3-8100 will bottleneck the gpu to some extent. you may already know that 3670 uses proprietary 8 pin motherboard power connector.  To use a standard 24/4 pin ATX psu you would need a 24 to 8 pin adapter. Best GPU For i3-8100 [2023] · 1. Geforce GTX 1050 Ti · 2. GeForce GTX 1650 · 3. Radeon Rx 570 · 4. GeForce GTX 1650 Super · 5. Radeon RX 6500 XT · 6. GeForce GTX 1660  
So I have been gifted a Dell Inspiron 3670 desktop, no video card, basic 290w psu and intel core i3-8100 cpu. I was also given an Nvidia EVGA GTX 660Ti as my friend upgraded and didnt want it. I am curious what would need to be upgraded (besides psu as i have a 500w on the way) to make this a basic gaming pc for low end games. i can play things like valorant with on board graphics on lowest settings getting around 50-60 fps. this is my first time upgrading a pc and dont want to fry anything, any help would be nice!
Upgrading Dell Inspiron 3670