When choosing a graphics card for your gaming PC, you should consider factors such as the GPU chipset, memory size and type, clock speed, power consumption, and compatibility with your PC's motherboard and power supply. Also, consider the resolution and refresh rate of your monitor to ensure the graphics card can support it.

A high-quality graphics card improves your gaming experience by rendering images faster and delivering smoother gameplay. It can handle high-resolution games and multiple monitors, provide more realistic visuals and special effects, and reduce lagging or stuttering issues.

Integrated graphics cards are built into the computer's processor and share memory with the CPU, which can limit their performance. On the other hand, dedicated graphics cards have their own processing unit and memory, providing superior performance for demanding tasks like gaming.

Yes, some gaming PCs allow you to use multiple graphics cards simultaneously to boost performance. This setup is known as SLI for Nvidia cards or CrossFire for AMD cards. However, not all games benefit from multiple GPUs, and it requires a compatible motherboard and sufficient power supply.

The need to upgrade your graphics card depends on the types of games you play and the performance you expect. If you play latest AAA titles at high settings or use VR, you may need to upgrade more often. However, a high-quality graphics card can often provide satisfactory performance for several years.