I posted in the original thread regarding this issue a long time ago spanning many software revisions
http://forums.evga.com/FindPost/2297650 Basically I have tried everything I could but to sum it up.
My system:
5930K
Rampage V Extreme
Corsair Dom Plat 3200 16GB RAM
EVGA 980 TI HydroCopper (Original issue was with 780 GTX)
Corsair K90 RGB
Logitech G13
Logitech G700s
Clean Windows 10 install now (original issue was with windows 8.1). No USB devices plugged in other than a Microsoft Natural Keyboard 4000 and Logitech G700s mouse. The ONLY Drivers installed are for the chipset, MEI, Realtek Audio, nvidia 355.98, and Intel LAN. After I log on there the keyboard input is severely lagged for about 30 seconds. Ive tried the Steam version and standalone installer. I have tried multiple keyboards with and without drivers.
To put it simply if I don't check "Start up on Windows" there is no keyboard lag. Problem doesn't exist if I use the other popular overclocking utility. When I was using my 780 GTX Classified HC previous versions of Precision X (Like 5.2.7) still had a little keyboard lag but it would only last a few seconds.
I really want to use Precision X but this bug is very aggravating and seemingly ignored.