i have P4 3.0 GHz , gigabyte 915g motherboard, x1950 pro, 2x512Mb kingston ddr1 ram. i want 2Gb ram for COH opposing fronts. my motherboard supports ddr1 400/333 and ddr2 533 ram. should i sell the two 512Mb ddr1 and buy two 1Gb ddr2? i don't know if 915g will handle ddr2 well.