i have a p5kpl/amps motherboard perhaps it is ddr2 but i want to buy a new graphics card under $150 my primary choices are GTS 250,GTX 260 and GTS 450 but as per the specification of those cards they are all DDR3 or GDDR3 or GDDR5.so i consulted with some dealers about that but they told me that i have to replace a DDR3 motherboard over my DDR2,but my budget is very low i can't afford another motherboard it is possible that i can use a graphics card from above and also i want to run witcher 2 and crysis 2 in very high settings so please kindly help me in this matter......