Hello,
Few days ago I upgraded from Windows 7 x64 to Windows 8 x64 (clean install RAID 0 UEFI - default 1903 bios) with a hope after such a long time it's been released there should not be much of a problem with drivers. It looked promising and without any problems. But then I noticed huge lag spikes while playing online like never before. I installed at first place drivers from Asus web for Maximus V, so I uninstalled them and tried the ones from Maximus VI without any help. After searching through internet I found several articles about issues with Broadcom in Windows 8 and for some people updating drivers to the ones for Windows 7 fixed problem but it didn't change nothing for me unfortunately. I switched back to Windows 7 and it's smooth and sexy again so I suggest some of You folks should investigate if it's a common problem. Cheers 😉