Unless you have a very old GPU, like AGP 4x/8x, PCI-E 1/2/3 are backwards compatible. Then again, a GPU with an AGP slot won't fit into a PCI-E slot. So just try inserting it first. Also, if you insert a PCI-E 2 GPU into a PCI-E 1 slot, that said GPU will not be able to perform optimally because it will be limited by the slow speed of the PCI-E 1 slot
Here's an image for better understanding You do not have permission to view the full content of this post.Log in or register now.