"The Windows Experience Index for your system could not be computed."

ThrashZone said:

The ram may actually be the problem
x99 sabertooth only supports 2400MHz
Set it to that and see what happens.

I have 2666MHz you might try that too I read it's a happy spot :/

i had seen that in the specs page on the asus site, but it also says it supports 3200+mhz too?
right now I have my both my ram sticks clocked to 3000mhz and it seems fine; before I oc'd it was set at default 2400mhz.

Just an update on this, I had reset my RAM to default, only for the same message to pop up.
When it's at default mode it runs at 2133MHz.