I have a Dell inspiring 3880

There were only 2 PSU available in the Inspiron 3880, a 200W and a 260W. Keeping that in mind the GT 1030 (with GDDR5 memory) is probably the best fit and will be nowhere near the capacitor or the wireless adapter. Any GPU larger would require a larger, in wattage, PSU. 

Can you just answer to my question 

No worries motherboard chip and WLAN card are both lower profile than pciex16 slot itself which is raised above motherboard platform level. Graphics card installation will have good vertical clearance from those.  What you might need to be concerned about is max length of video card or horizontal clearance of 3880 chassis.  Chassis depth is 293 mm (11.54 in.)

user benchmark shows a 270 mm card EVGA, RTX 2080 Super KO Gaming, NVIDIA GeForce RTX 2080 can be installed in 3880.  this card is definitely long that it hovers over WLAN card etc. without vertical clearance issue.

Thank you, you are a life saver and I will be using the one which does not requires external power and online calculator is showing 260w so will I be good to go

Thank you sir, will a gtx 1650 fit in this case it is 22 cm which is coming till wlan 

basic online psu calculator estimates Load Wattage: 252 W
Recommended PSU Wattage: 302 W

(based on i7-10700,16gb,nvme+7.2khdd,dvd)

so you will be good to go with 260w psu, which meets load wattage (max pc may consumer in typical real world scenario)

I have i3-10100,8gb ram ,no ssd and dvd

Load Wattage: 213 W
Recommended PSU Wattage: 263 W