Chewbacca_69
I have x99 ftw mobo (not the K version), and I was going to get AIO Corsair's H115I for cpu cooling. However it looks like there is only one 2.0 usb header on the mobo, is that right? If so, is there any alternative to adding more? Cuz its no bueno for people who have a case that has front panel 2.0 usb ports like me. Thanks 

 
NZXT USB Extender should do the trick.

I use this item:
         ChenYang USB 2.0 9 Pin header male to Motherboard USB 3.0 20pin Housing Female 10cm cable

Chewbacca_69
Just FYI, the 1.1 version has been known to fry mobos, so make sure to go with the 2.0 version. thanks for the replies :-). 

Please be more specific.

Can I get a explanation on what is version 1 and 2.  I'm still wondering what some of you are talking about.

The 1.1 revision has two IC chips and is labeled as rev1.1. The 2.0 version has a single IC chip and is labeled as rev2.0.

The 1.1 revision has a history of frying motherboards/RAM/GPUs when its cheap capacitor blows up. The 2.0 revision seems to have addressed that problem.

Thank you for this.  

Now I'm wondering if this was the culprit that blew out my first X99 Classified MB, Corsair Link Node (Smoking and connected via USB to the V1 NZXT extender) and a GTX 480.  All has since been replaced but had issues connecting my headphones to the rear USB 2.0 headers of the MB and my Aquaero 6 XT had issues with its touchscreen, also connected to the NZXT USB extender.

This has me a bit worried as I have had all of these things connected to the extender prior to the blowout and still do after.  Maybe I should take the hit and replaced it with the newer version.  Is NZXT by any chance announce the issues and replacing the old ones with the new ones?

Well tbh, still think it was the PSU that since has been replaced (AX1200i).  I had the first revision firmware that had OCP disabled so my system had no protection till Corsair Link in Windows ran and enabled it which was mind boggling on their part.  The same thing had happened to a well respected reviewer prior my blowout.  I have it well documented here.  They investigated to the extend there was no way I could have pulled it off with limited resources and they found out that the PSU company had quitely without announcing anything replaced their firmware roughly 3 months after release of the new PSU product to have OCP enabled by default as soon as the PSU is turned on.  This is why I think is the cause of my blowout but I do use and still use a NZXT V1.  I'm using it as we speak.

More info here as well:
Z170 FTW. No usb 2.0 header!! :(  & EVGA Z170 FTW LGA 1151 problems/design concern (Where did USB 2.0 hubs go?) 
and the use of the NZXT IU01