Transistors may not need to be 100% working on 100% of the die to be shipped. If the fault is contained within a subsection, the manufacturer can set fuses to d

Transistors may not need to be 100% working on 100% of the die to be shipped. If the fault is contained within a subsection, the manufacturer can set fuses to disable portions of the chip. This is generally used to distinguish features between product lines. Processor A could have VT-D failed in manufacturing, so it's fused off and sold as a cheap processor. Processor B could be fully working, but Intel needs to sell more cheap processors, so they intentionally disable VT-D on B. Sony did something similar with shipping Playstation 3s since they couldn't get the yields high enough initially. They disabled 1 SPU of each processor since they could reliably get 7 working ones in manufacturing. Those 8 SPUs are more interchangeable though, they're more like graphics chips in that regard than general x86 CPUs.