I am going to buy a computer rig for Cycles off Craigslist, but the GPU it comes with is not very good for cycles. He is willing to keep his GPU (gtx 770), and reduce the price. I will just get a GTX 580 elsewhere. However, the mother board is PCI express 3.0 and the GTX 580 is 2.0. I think it will work, but will there be performance loss? I understand a PCI 3.0 is not going to make the 580 run better, or at PCI 3.0 speeds, but will it be slower compared to running the 580 on a PCI 2.0?
Here is the rig I’m looking at in case anyone is curious:
Thanks for any help!