There is two types of graphic cards: Reference card and custom card.
Reference card is made by blueprints for that exact card like gtx960 reference card is made with standard gtx960 blueprints or howevet you wanna call it.
Custom cards are redesigned by each manufacturer, basicly they make cooling on them better so they are better for overclocking and they also redesing the PCB so it can be really really hard to find a water cooling block for them. Since they are quite better than the reference cards they are more expensive but you do get more performance out of them.
I looked up some pics of your pc and to be honest I've never seen that kind of PSU, it's just wierd and if it support only up to 330w then I don't know what could be the solution.
Anyways Thank you for your help and info
il just search and find a solution...There is always a solution..