I think I answered my own question. I use command prompt and typed in: wmic memorychip get speed and got this:Speed26662666 Showing both running at 2666MHz. I guess I had to add the 1333MHz's in CPU-Z together. It's just the 1330.2's in the left picture were making me question it.
I bought two of these to get 32GB: HyperX FURY HX426C16FB4/16 16GB 2666MHz DDR4 Based off this thread: [URL] I ran CPU-Z and this is what I get. Is it actually running at 2666MHz? [IMAGE]
Inspiron 5675 Memory running at 2666Mhz?