A:AnswerSingle core performance and multi core performance is faster on the i9. I believe this i9 has 6 cores. The i7 comes in two flavors; 4 core and 6 core.
A:AnswerI searched the "system info" and found that it's running Windows 10 pro, version 10.0.17134 Build 17134... I didn't see anything that resembled 1803 or 1809.
Hope this helps a little.
A:AnswerThe highest capacity solid state drive the device was tested with is a 1TB SSD. There is no guarantee that a higher capacity SSD will work with the device. Upgrading the device to 2TB SSD will be at your digression.