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Your 9010MT stock psu is 275W which is good enough to support GTX 1050 based on online basic psu calculator, assuming i7-3770, 16Gb ddr3, one hdd or ssd, 22” lcd, no optical drive.  psu need is less than 270w.  If you have dvd RW, it bumps psu need to 300w.

nvidia recommends 300w which is just a ballpark overall estimate.  In a prebuilt pc you often do not need that much.

9010 uses standard 24 pin ATX (whereas 9020 uses proprietary 8 p8n).  The 24 to 8 pin adapter is irrelevant to you.

@redxps630 

275W

good enough to support GTX 1050 based on online basic psu calculator. 

Both blanket statements about the 9020 are wrong.

9010 does not use 24 to 8 pin.

9020 mini tower has 290W and it does not support 75w card without optional 365W power supply.

https://www.nvidia.com/en-gb/geforce/10-series/#1050-ti-spec

Recommended System Power (300W)

Dell uses 305 - 365W bare minimum.

Telling people that its fine is bad advice and goes against the safety regulations.  Thats why NVIDIA says 300W minimum and Dell has 305W units to support that. Stock power supply is 290W and it only supports 50W video card max. The optional 365W power supply is needed for 75W to 150W cards.  @DELL-Chris M can verify this.

There is even a user who designed his own adapter for a 500W power supply.

https://raphtec.wordpress.com/projects/dell-poweredge-t20-atx-power-supply-adapter/

7VK45

T1M43

The 24 to 8 pin is an adapter for non dell EPS12v power supplies and its only for the TOWER model because the other sizes dont have standard size power supply.

https://www.moddiy.com/products/Dell-OptiPlex-9020-PSU-Main-Power-24-Pin-to-8-Pin-Adapter-Cable-30cm.html

Only the BLUE slot supports 75W for MINI TOWER ONLY.  24 to 8 pin does not apply for 9010

24 to 8 pin Does apply for 9020.with NON DELL POWER SUPPLY.

9010 BLUE SLot

Re: it has an optical drive but i dont use it. will it still use up watts? how do i disable it

just disconnect power sata cable to odd. It will not use power.

user had demonstrated running GTX 1050 Ti (similar to 1050 in power need) in 9010SFF which has a weaker 240W psu.  You will be fine.  No need to be discouraged.  

thank you, i was getting scared that itd blow up or smthn, does a 144hz 24 inch monitor affect the psu heavily?

online psu calculator shows power need is independent of LCD monitor.  taking monitor out of equation does not affect psu estimate.  this makes sense as the monitor draws video data signal from pc and has its own power.
psu does depend a little bit on storage (ssd more energy efficient than mechanical hdd) and ram configuration (2x8 ddr3 is slightly more efficient than 4x4).  

for i7-3770, 2x8 gb, GTX 1050, sata ssd, no odd, 8 hr/d, psu = 272w.

using more power than you have will eventually damage things.

The power calcluator site is Not Dell or UL safety certified.

Optiplex 9010 Tech Guide 

No need to disconnect things to power a 75w GPU.

9010 and MT and only in the BLUE slot

24 to 8 is 9020

9010 tower blue slot