ok i have a AMD athlon IIx2 4450e 2.80 GHz dual core processor and a GTS 450 2 gb graphic card on which i can run most of games at medium settings and i want to upgrade,should I upgrade from dual core to 6 core AMD FX 6300 or from GTS 450 2 GB to GTX 750ti 2 GB DDR5,also tell me can GTX 750 ti run on this supply : http://www.zebronics.com/products/deluxe-series/zeb-450w-value-plus or i need to buy new one,if so then which one should i buy?