Ok first you want to select the
Disk tab at the top. This will give you just the graphs for the disk usage and also the data for the processes that are using the HDD. In the
Processes with Disk Activity table, if you click the
Read column it will sort it from greatest to least. Looking at the top graph on the right pane, the scale of that graph is auto scaling, so the graph without the scale is useless. The graph could be showing spikes off the chart, but if the scale is like 1MB/s then there isn't much disk activity. So pay attention to the scale. It will auto change if the graph exceeds the scale by a significant amount.
Here is mine just sitting at the desktop:
Obviously yours is going to be a little more busy when gaming. Have this open while running DS3 and watch for when it stutters. You should see a large spike on the graph and a corresponding jump for the DS3 process or System if Windows is using the pagefile. I actually think the table for
Disk Activity in the column
File will show if the pagefile is being used. I couldn't get mine to appear, but that's because I have 16GB of RAM. I'm guessing that you will have a file in the File column that looks something like
C:\pagefile.sys in it.
By the way hitching used in this context means pausing or stuttering. It can have other meanings too which have nothing to do with computing. In the context I was using it, I meant when your system was making those long pauses like it was frozen. In your case it's not just your game that pauses, the entire computer pauses. This really makes me think that the entire computer is struggling under constrained memory resources. It's not heat related, that's why when you run Prime 95 with Small FFT's (doesn't use much RAM), you don't throttle. You could probably run Prime 95 and Unigine Heaven at the same time and you still wouldn't stutter as long as you didn't end up using all your RAM.