Those are fine, it's 800mhz because you are idling and 100bclk is normal. Did you get the graphics drivers from nvidia or dell?
I got them from NVIDIA. I just ran a quick 2 minute stress test using OCCT (never used this program before) and it appears my computer is only using half of my RAM as well unless I am just reading this wrong. I should also note that my computer generally does feel slower, unless that is just my mind playing with me. I'll add some pictures.