So I've been reading up on PCIe 4.0, and expectations for it are speeds of 32GB/s. The question is, are video cards getting capped by the current PCIe 3.0 interface, therefore making an upgrade to PCIe 4.0 a no brainer? I am trying to decide whether to upgrade now (from Z-77, 3770K to X-99, Broadwell-E) or next year, when PCIe 4.0 is expected to come out. I really can't decide if I will *need* PCIe 4.0 in 2-3 years when I upgrade to the next generation video cards (or the generation after that). Thought?