ok, i'll check the case. But if it is 450watt should i go for GTS 450?
Probably useless to open the case, now i have read what malmental said, it probably will be a 350 and i don't know about Dell 350W is 425W in real live. Malmental is probably right i think, he normally knows what he says.
But still i would save some extra cash to first buy a good PSU and after that buy a good GPU, otherwise you will always be stuck with low profile GPU's and not be able to play games at satisfying levels.