I had a look at the specs for some motherboards recently and I noticed that all the boards that I looked at, even the very expensive ones, couldn't run two PCI-E x16 slots at full speed at the same time. I expect this is due to bandwidth limitations. Is this the case for all motherboards, and what is the implication for the performance of graphics cards that are installed into the slots? The spec sheet for my aging motherboard (GA-X58A-UD3R - which is still fine by the way) doesn't cover the topic, but the slots in that board are PCI-E v2. Maybe only PCI-E v3 is affected by this? Thanks in advance.