A:AnswerIt comes with both a keyboard and mouse. I upgraded the mouse to an Alien Gaming Mouse when I purchased this system. That doesn't mean the included mouse has any issues, I actually used it to do the initial set up, I simply wanted something more gaming oriented for my kids.
A:AnswerThis desktop has Intel Optane Memory, which works like an SSD Cache. If you don't mind performance roughly equivalent to an SSHD (Solid State Hybrid Drive), where the startup times and your most used programs will be accelerated to around SSD-speeds, then you don't even need to add an extra SSD. Since Optane tends to come in 16gb and 32gb configurations though, it'll be very likely that this computer would have performance actually superior to most SSHD's, and for most things you do, you'll get very close to SSD performance.
That said, since I don't own this computer, I couldn't tell you what kind of SSD to get. If the mobo has an M.2 slot, I would guess it's taken by the Optane memory though.
A:Answerit's buried in the description but it does say it has at least some liquid cooling. nothing to be seen on what the power supply is in the description though. I tried finding this model on dell's website, they didn't have it and rebuilding it from a lesser model ran the price well above what best buy is asking. I pasted the model number into dell's search and it didn't even come up with a pc. don't know what that's about. looked it up on cnet, they said this Power/
Type
power supply
Min Operating Temperature
41 °F
Nominal Voltage
AC 120/230 V (50 - 60 Hz)
Max Operating Temperature
95 °F
don't know if you can do the science to turn that into watts, but it's all ive got.