Questions about PNY Nvidia T400

No. But it's best to use the right cables. So Mini-DP to DP. Otherwise there may be problems (loose contact, etc.)

The graphics card can be used in a Dell OptiPlex 7090 SFF if the computer offers the required PCIe connectivity and sufficient power. The graphics card requires a PCIe 3.0 x16 interface and consumes a maximum of 30 watts. It is important to check the specifications of the computer to ensure that it supports the graphics card.

For me as a noise-sensitive person, this is within the acceptable range. Yes, the fan turns according to power consumption.

Just a plate for the wide slot. Nothing else!