I want to upgrade my Graphics card from an amd radeon hd 6450 to a MSI GeForce GTX 750 Ti GAMING Twin Frozr IV OC 2GB GDDR5 128-bit my specs are : Intel xeon x3360, 16 gb ram motherboard from dell optiplex and amd hd 6450. My graphics card (hd 6450) is small i mean it fits in the slot and the one i want to get is bigger than this one. can you help me if it will it or recommend me another graphics card ? I don't have a good power supply because my budget is limited.