Okay, that's interesting - but this isn't really what I'm looking for.
I have a lot of external USB storage devices - hard drive enclosures, gaming controllers, UPS, scanner, etc. that all need USB - all my HDD storage enclosures use 3.0. My current PC came with
8 rear USB 2.0 ports, plus another connection internally for front USB like you linked to.
I'm looking at many Z170 ASUS and Gigabyte motherboards and they have 2 or 3 USB 3.0 rear ports and maybe another 2 USB 2.0 rear ports total (I'm talking rear only). I have lots of USB components and I don't want them al hanging out the front of my PC. That's why I want a motherboard with lots of rear ports.
ASUS Z170-A ($154.99): 2 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 Type A
ASUS Z170-PRO (194.99): 2 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
ASUS Z170-DELUXE ($299.99): 1 x USB 3.0, 5 x USB 3.1 Type A
ASUS Z170 PRO GAMING ($154.99): 4 x USB 3.0/2.0, 2 x USB 2.0, 1 x USB 3.1 Type A
ASUS ROG MAXIMUS VIII HERO ($229.99): 2 x USB 3.0, 4 x USB 2.0, 2 x USB 3.1 type A
ASUS ROG MAXIMUS VIII HERO ALPHA ($288.99): 2 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
ASUS ROG MAXIMUS VIII RANGER ($199.99): 2 x USB 3.0, 4 x USB 2.0, 1 x USB 3.1 type A
ASUS ROG MAXIMUS VIII FORMULA ($399.99): 8 x USB 3.0, 1 x USB 3.1 type A
ASUS ROG MAXIMUS VIII IMPACT ($238.99): 4 x USB 3.0, 1 x USB 3.1 type A
ASUS SABERTOOTH Z170 ($209.99): 2 x USB 3.0, 4 x USB 2.0, 1 x USB 3.1 type A
ASUS SABERTOOTH Z170 MARK 1 ($229.99): 2 x USB 3.0, 4 x USB 2.0, 1 x USB 3.1 Type A
ASUS Z170-PREMIUM ($389.99): 2 x USB 3.0, 2 x USB 2.0, 2 x USB 3.1 Type A
GIGABYTE G1 Gaming GA-Z170X-Gaming 7 ($209.99): 5 x USB 3.0, 1 x USB 3.1 Type A
GIGABYTE GA-Z170X-UD5 ($179.99): 3 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
GIGABYTE GA-Z170XP-SLI (rev. 1.0) ($135.99): 3 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
GIGABYTE G1 Gaming GA-Z170X-Gaming G1 ($419.99): 7 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
GIGABYTE G1 Gaming GA-Z170X-Gaming 5 ($166.99): 3 x USB 3.0, 4 x USB 2.0, 1 x USB 3.1 type A
GIGABYTE GA-Z170X-Gaming 6 ($189.99): 3 x USB 3.0, 4 x USB 2.0, 1 x USB 3.1 Type A
GIGABYTE G1 Gaming GA-Z170X-Gaming 3 ($119.99): 3 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
GIGABYTE GA-Z170X-SOC FORCE ($379.99): 5 x USB 3.0, 2 x USB 2.0, 1 x USB 3.1 type A
Many of these motherboards listed above have no more than 5 or 6 USB ports total, with half or less than half being high-speed. When I bought my 5-year-old motherboard I didn't spend much more than $200 and it came with 8 USB 2.0 ports. Of course back then I wasn't expecting or needing 3.0, but I'm amazed these days so many boards still include only a few 3.0 ports. Plus I'm losing Esata. It looks like for the majority of boards I need to spend close to $400 before I get a good amount of 3.0 ports. The Gigabyte cards seem to offer more USB ports in general, and more 3.0 ports. The first Gigabyte Gaming 7 motherboard I listed looks like a pretty good option actually - only 6 versus the 8 I have now, but all 6 are high-speed and looks like a quality motherboard - I'll have to read some reviews on that one, though a review on a similar Gigabyte Gaming GT says it throttles his 6700 CPU at anything over 4.0 so I'll have to look into that a bit and see if the Gaming 7 has any issues like that. It might just be his configuration of course. The Gaming 7 seems to give some people issues with audio too, so I'm not sure if that's something to worry about.
I'm just surprised that so many years later and 3.0 ports still seem to be at a premium. I though by now all USB ports would be 3.0 standard since they're backwards compatible and I have devices from years ago that are 3.0. Instead they're giving us built-in graphics that I don't need and taking away useful high-speed USB ports.