I currently have one HD 4890 Sapphire Vapor-X 1GB on my M4A79 Deluxe Motherboard (PCI-E 2.0 @ dual x16, triple x16 / x8 / x8, or quad x8 link). I will be purchasing another HD 4890 soon, and a third in July. What are the cons of having 3 GPU's on my motherboard when it comes to the "link"? What does the x16 even mean? I've been doing some looking around, but I can't find the answer.
How much of a performance decrease is it with x8 instead of x16?
How much of a performance decrease is it with x8 instead of x16?