P170HM memory 2T 4GX4 = 2133MHz
Here is the 1T mode 4GX2 memory test
-1T with less delay, preferably the system memory performance. But poor compatibility. Suitable for your DIMM not populated.
-2T has a longer delay, much worse system memory better. The higher the compatibility, stability. For your DIMM is fully populated.
We recommended that the 1T memory settings allows memory to achieve the best performance.