So this will most definitely fit the Optiplex 3020?

Not sure about a 3020 but it definitely fits a 7010

Would this work in a dell precision tower 3420

I don't believe that this power supply will fit the case. If you look at the picture of the 3429 supply on Amazon you will notice that at the end where the AC power connector is that there is a square recess on the one side - this supply is rectangular with no recess. Electrically it would probably work but you would have to see if it would fit inside the case.

Will this work with Optiplex XE2?

If suggest to carefully look at the specs from the manufacturer, I got it for a different model.

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Brand	POINWER
Model	AC255AS-00 AC255ES-00 DPS-255LB
Package Dimensions	27.6 x 10.8 x 8.9 cm; 980 g
Item model number	AC255AS-00 AC255ES-00 DPS-255LB
Compatible Devices	Personal Computer
Audio Wattage	265 Watts
Wattage	255 Watts
Batteries Included	No
Batteries Required	No
Form Factor	SFF
Has Auto Focus	No
Programmable Buttons	No
Item Weight	980 g

NT1XP YH9D7 255W Power Supply For Dell Optiplex 3020 7020 9020 Precision T1700 Small Form Factor (SFF) Systems R7PPW 3XRJ0 V9MVK FP16X T4GWM M9GW7 FN3MN H255ES-00 D255AS-00 D255E001L F255ES-00

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