Sir Dude

Yeah so thats not gonna work ever on a mac 😛 Surprised it booted even
 
Apple requires you to use bootcamp in osx to make an install of windows so it can configure all the drivers specifically for that mac

You need the nic windows drivers for your mac pro not drivers for a cpu as those dont need those
 
What mac pro is this?
 
If you didbit correctlt via bootcamp then all drivers should be present

Do you know for a fact that Intel is the manufacturer of the network card?
 
You're asking for drivers for the Xeon x5650, which is a CPU and generally doesn't need/have drivers. So I assume you mean drivers for whatever network card is included with the motherboard. Which OS are you running on the machine, is it macOS, or did you install Windows or Linux?

Basically the only way it'd be possible is if someone made a custom ROM for that particular device. You can search sites like xda-developers to try and see if there are some. 

You can find aftermarket shells with the original colors and adapted to IPS screens, so i would spend a bit of extra money and do that. 
 
For the IPS screen, go with the original Funnyplaying screens, unbranded/third party screens are usually badly color calibrated. You could take a look at My Life In Gaming's videos about the GBA IPS screens, they're always very illustrative.

Well not all thermal sensors look the same but what you could do to test is turn the PC on and put it next to something hot

Yep, and they break down decent comparison graphs as well.  Always been a good source for relative performance but as with everything apply your use case, logic and common sense.
 

This..
 
"Do you just have to do research on each CPU you're interested in or is there a faster off-hand way of finding out?"
 
And a lot of YT videos, Passmark, etc. etc etc.

and just in case you're curious, here's a description of the psu "building blocks"
 
On the bottom, there's most likely a controller chip and a voltage reference and a few other tiny components... basically the voltage reference always outputs a fixed voltage, like let's say 2.5v - the output voltage comes to the controller chip through that black component on the right side of the transformer (optocoupler), controller chip compares voltage with the reference voltage and if it's too low, it increases the number of pulses, if it's too high it lowers number of pulses. That's PWM (pulse width modulation).
In theory you could modify the voltage reference to fool the controller into outputting a higher voltage than 12v or whatever is there, but it's risky, and there's not much room - you could probably safely get it up to 14v or so. There are other limitations in the design of the psu that are harder to go around. For peltier elements. it's not enough of a voltage variation to make it worth the hassle.
 

You can measure voltages with a digital multimeter, even the cheapest one will be suitable for your needs.
Here's an example of a cheap and ok one, it's heavily discounted now so it's only ~6$: Extech MN25 MiniTec Digital MultiMeter
You twist to DC voltage on the setting you think it's higher than the voltage in circuit, and you measure.
For example, the meter above has setting for 20v and 200v and 600v ... I'd put it on 200v and measure. If the voltage is lower than 20v, I can switch to the 20v range to get a higher precision (more decimals).
 
No need to replace the power supply just because those capacitors are going bad. And no, they're probably going bad due to heat in that area of the circuit and just the capacitors being of bad quality from the factory, unable to handle heat. 
You can buy quality capacitors and replace them yourself, if you have a soldering iron around.
Here's an example of good high quality capacitors you could use and will last years: https://www.digikey.com/short/p1ttfh
Any result from the filtered list above will work.
 
Same site has fans you could buy to replace that cheap fan. I don't see the label but I saw you wrote 8x8x2.
The standard fans are 80x80x25mm , not 20mm (2cm), but Digikey has 20mm fans as well if you really mean. I think you mean 25mm (or 1" more or less, 25.4mm)
Here's a list of 80x80 x 20/25/25.2/25.4mm fans, powered by 12v : https://www.digikey.com/short/p1tt24
You can further filter by bearing type, by amount of airflow and so on.
I'd suggest avoiding the sleeve bearing ones (cheapest) and to get something with a bit more airflow, as you can always set that switch to lower rpm (the switch simply puts that resistor on the board in series with the fan, reducing the voltage going to fan, so the fan spins slower)
For example, I'd suggest: https://www.digikey.com/product-detail/en/sanyo-denki-america-inc/9A0812G401/1688-1334-ND/6192050
It has 3 wires, but the third (yellow) is just a rpm sensor, you can cut it or just tape over the end (so it won't touch anything) and leave it disconnected.
If you don't want to spend that much, this will do: https://www.digikey.com/product-detail/en/sunon-fans/MF80251V1-1000U-A99/259-1804-ND/6198742