Yes you can use a AGP 8x card in your 4x slot. You may not get top performance out of the card though due to it being capped by the AGP 4x standard.
Hi, just want to ask you guys out there if a AGP video card with 2x/4x/8x bus standard can be used in a motherboard capable only of 4x bus standard. Just wanted to know because i find it difficult to find a video card with 4x bus standard maybe because its a little bit out dated. Thanks