a friend of mine gave me a graphics card that he didnt need any more. its an e-GeForce 8600GT with DX10, 256mb ddr3, pci-e. I currently have an AMD Athlon 64X2 2.2 dual core that will accept both ddr and ddr2. will adding this to my system mess it up since it has ddr3? should i sell it and find one that comes with either ddr or ddr2 that would be more compatible?