• What processor do you have?
• How many watts is your current PSU?
• How much RAM do you have?

Most current GPUs use PCIe 4.0, some of them x8, but they will still work in PCIe 3.0 x16. It’s a bandwidth thing.

Besides that I’d say take the TDP of the GPU, say it’s 200W, double that and you’ll be fine. Usually they’d say add all of your components’s maximum power, multiply by 2 and that’s your PSU. With current PSUs, they are efficient enough to manage 65-70% at maximum efficiency. Your GPU is the biggest power draw. Say your total system uses 450W and you have a 500W PSU, your PSU will run less efficiently but your system will still work fine.

Another consideration is your current CPU. Your CPU prepares every frame for your GPU to render. If your CPU is a lil older, it may bottleneck your GPU, ie it will have to work too hard to keep your GPU busy.

Your GPU is your most powerful component and every other component influences whether it can reach its maximum potential.

Yes.

Pcie x16 slot? (you could look up in the board manual how fast it is - number of lanes and pcie version. But basically the standard is downwards compatible - newer cards work in older slots, but slower. )

Dimensions: does it fit in the case? Is the cooling (outtake of the case) sufficient?

Power supply ready? Check if the psu (power supply unit) delivers enough power to supply the new gpu. Check if there are the right plugs/ cables to feed the gpu - some require one 75w-connector, some even two.