any new GPU needs to be within a certain size due to the small case and the present PSU is non propriety which means that any new PSU will need to be used with an adaptor, see thread here
Already provided the necessary information.measure inside of the case to see what size GPU will fit in there, most GPUs are dual slot as well so any card in the PCI slot would need to be removed or the new GPU will not fit.
There is one thing that is possibly worse than using a known poor quality brand of PSU and that is using one that is unheard of, for brands of PSU to trust and brands to avoid please refer to the links in my sig.
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