Hello Ryan, in regards to the information you are requesting there are not much differences on the I7’s S & T versions.
Please check this link. It will compare three i7 processors.
- The normal version uses 84W; therefore the clock speed will be 3.4 GHz.
- The “S” version uses 65W, so the clock speed will decrease a little 3.1 GHz.
- Finally, the “T” version uses 45W. In this case the clock speed will be 2.5 GHz.
All three processors support the same memory speed, 32GB of RAM, same number of cores and threads, same graphics and technologies.
Something very important is that the “T” version processors can be found only as TRAY units.
Additional information could be found at this link Learn About Intel® Processor Numbers
All Intel processors use 12V, even though you are using a “K”, “S” or a “T” version.
The S and T versions are for low power consumption; therefore the performance of them is not going to be as good as a "K" version processor.
If you are more interested about processor power information or any other detail feel free to look at the datasheet http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-family-desktop-vol-1-datasheet.pdf