James Mcgreivy said:
well i "accidentaly" already bought it and realised the problem. The card is plugged into my pc, and its powered off with all the cables out awaiting a new psu. When closing the case it fits the case but i might not fully understand you
There is more than one "type" of inspirion 660. Some of them are called "slimline" and have a narrow width form factor on the case. If you have that type, regular (full size) atx psu's are too wide to fit and most gpu's have the same problem. If you have a full height gpu (card same vertical size as the hold down bracket), you have an atx sized case.