There's a few with exactly three USB3.0 ports, and there are some with four USB3.0 ports. But most cases offering these many USB3.0 FRONT PANEL ports are the big ones (mostly by In Win). Here are some suggestions:
Well no, because a 20 pin USB 3 has 2 channels...
Three wouldn't even make sense, maybe 4! but no i haven't seen any with 4. Most mobos just have a single 20pin USB 3 header.
There's a few with exactly three USB3.0 ports, and there are some with four USB3.0 ports. But most cases offering these many USB3.0 FRONT PANEL ports are the big ones (mostly by In Win). Here are some suggestions: