Getting down to the nitty gritty, the big voltage regulator is the biggest difference between the Z390 Gaming SLI and the other sub-$160 Z390 boards we’ve tried. We’re looking at 12 phase groups, and at this point we really don’t care how they’re split or combined if they have adequate amperage to support the Core i9-9900K, since that’s where competing boards fell short in our tests.
Read more @ Tom’s Hardware