Welcome to the forums my friend!
If you're referring to the Deepcool DE500, it's a very poor quality power supply.
That and it isn't even 500W. It's actually 350W and they've labelled it as their peak wattage, which frankly is appalling in my opinion!
So 750 Ti is actually a really low power GPU, and a good quality 350W can run it quite easily. But IMO, I'd avoid that one. A good quality one will always pay off and not damage the stability your system or damage your components itself.
See point 1 here:
https://forums.tomshardware.com/thr...when-selecting-parts-for-a-custom-pc.3510178/
if you're really on a budget, the lowest one I'd recommend is:
Power Supply: Corsair CX (2017) 450 W 80+ Bronze Certified ATX Power Supply ($44.89 @ OutletPC)
Total: $44.89
But even then there are still better if you want to embrace more quality and maximise your rig lifespan!