jettstar :
what if i put in a new psu
The SFF case limits your PSU selection to TFX form factor PSUs. Not many of these are available above the 300-400 Watt range due to size restrictions and the fact that high end high power consumption cards very rarely come in low profile variants. If you could find a 400 Watt TFX form factor PSU, that would be sufficient. The other alternative is you get a full sized PSU and simply run it outside the case, but if you do that you might as well get a new case too and try to transplant all your other hardware to it.