macbook pro 15 mid 2012
For your two points, with the exception of the Intel Core i7 6800K, all the Xeon E5 and Core i7 CPUs support 40 PCI-E lanes. However, one thing to keep in mind is that X99 boards (which are primarily designed for Core i7, but work fine with Xeon E5 as well) tend to have more add-ons like extra USB controllers, Wifi, etc. built in which might. CPU: Intel Xeon E3-1225-V3 Ram: 8GB, Kingston HyperX Fury 1600MHz GPU: Gigabyte Radeon R9 290X, 4GB Cooler: Noctua NH-U9S PSU: Chieftec 400w SSD: A-Data 120GB HDD: Westerndigital 750GB.