Motherboard is an ASUS P5LD2 ,I currently have a radeon X300/600/1050 series, Someone said to put in a GTS 450, I have nooo clue what i'm looking for because when I look it up comes up with ddr3 and ddr5 and mobo can only handle ddr2 plus its apparently got to be pcie, anyone have suggestions on cards and links so i know what i'm looking for, would be appreciated.