Fairly recent benchmark with cards dropping nothing from 16x to 8x : http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus http://

Fairly recent benchmark with cards dropping nothing from 16x to 8x : http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-per... Linus Tech Tips has a rant about how Intel is trying to segment the market by only offering more PCI-E lanes on the most-expensive CPUs despite mobo support with their new X299 platform (they've done this in the past as well): https://www.youtube.com/watch?v=TWFzWRoVNnE https://www.youtube.com/watch?v=TWFzWRoVNnE Basically, if you want the full 44 lanes, you have to get the top-spec processor for $1k ($1k for the cpu itself). The i9s above the 7900x don't even have details yet, since Intel is working on adapting their Xeons to their new HEDT platform to keep up with AMD. Here's the breakdown: https://www.cinema5d.com/wp-content/uploads/2017/05/Intel-core-i9-2.jpg https://www.cinema5d.com/wp-content/uploads/2017/05/Intel-co... I've also heard speculation that they're crippling the lanes on cheaper chips because they're so worried about cannibalizing their server market. Don't expect ECC support on these either. Honestly, if any Xeon BIOSes and CPUs supported unlocked multipliers, they'd be a better deal, but I get that overclocking and max stability don't really mix. OR they could totally wow everyone and come out with some 5.0Ghz (all-core) 16-core chip that isn't overclockable any further but can run ECC. Sell THAT for $2k to workstation users and rich gamers. Make it 2P capable as well in case you need 32 cores. Maybe AMD will do it with ThreadRipper, which BTW has 64 PCI-E 3.0 lanes ( https://www.pcper.com/news/Processors/Computex-2017-AMD-Threadripper-will-include-64-lanes-PCI-Express-30 https://www.pcper.com/news/Processors/Computex-2017-AMD-Thre... ).