I have a computer except for its graphics card. The graphics card is integrated but I have a pci express x16 slot, and two regular pci express x1 slots and ten also a normal pci slot. So how do I tell which cards will work in my computer? And how do I find them?
The x16 slot will fit your gpu. You just have to check if your power supply meets the requirements, if your cpu does not bottleneck your gpu and if the new gpu fits your case. Goodluck. If you post your specs and the card you are considering, I can take a look for you
Like fastreaction said, you've got to be more worried of the PSU and CPU rather than anything else. Since you've got a PCI-E X 16 slot, it can basically hold in any GPU.
Could you mention your motherboard? Also, what's your budget for a GPU?