Is it a laptop or a prebuilt desktop? And if it's a dedicated graphics card in a PCI-E x16 slot, it is possible to remove it and replace it, but your power supply might not be able to handle it, and it might not be a standard power supply, so you'll also need a new case, but the motherboard is proprietary and you might just want to upgrade your CPU as well and that basically means you'll just get a new PC if you go down that route. Do you have a picture of your PC with the side panel (left side) off?