P2715Q 4K w/ Mac Pro (Late 2013) in Boot Camp/W8.1

I have two P2715Q 4K displays hooked up to my Mac Pro (late 2013) (AMD FirePro D300 GPUs). They work great (so far) in OS X Yosemite - full 4K @ 60Hz.

When I use Boot Camp w/ Windows 8.1, the highest resolution it can go is 2560x1440. The device driver shows the displays being recognized as P2715Q 4K/60 displays.

Anyone know how to get Windows to use the full 3840x2160 resolution?

Thanks!

[edit: I figured it out myself - I uninstalled the AMD FirePro drivers, downloaded new ones from AMD, and installed... rebooted, and bam, there was the full 4K resolution! and looks great by the way]