Looking at the prices the lowest priced x299 board costs about half than the hi-end ones. Is that price gap really justified? What is the difference between them in practice, apart from the extra features that one doesn't really need. Has anyone done any testing like this, comparing performance and overclocking using the same silicon (preferably more than one chip) to compare what are you actually getting for your money? More power phases yes, that looks good on paper, but how much does it matter in actual clocks? I'm really curious.