The difference in clock speed and max transfer rate numbers look impressive on paper, but DDR3 RAM is in fact just 2 to 10% faster than DDR2 RAM for most real-. [HOST] › › Motherboards. What's the difference between SDRAM, DDR, DDR2, DDR3, DDR4 and DDR5? Discover and compare the different generations of RAM with Crucial. [HOST] › Will-DDR3-RAM-work-on-DDR2-motherboard. Is it that you only have two DDR2 slots or something? They do sell 4GB sticks of DDR2 (so. DDR2 is for a DDR2 slot and DDR3 is for a DDR3 slot. The slots are incompatible, so you can't put DDR2 Memory in a DDR3 Slot, or vice versa. . If the board is DDR2 you must use DDR2! If the board is DDR3 you must use DDR3! There is no way around this unless you purchase one of the few hybrid boards out. There is just so much of ddr3 to ddr2 slot to discover, so take advantage of the deals and buy your ddr3 to ddr2 slot online on AliExpress now! Simply browse an. [HOST] › geforce › forums › gaming-pcs. Although DDR3 and DDR2 are both Pin modules, they have different electrical designs, operating voltages and memory slots. Therefore, DDR2 and DDR3 cannot. If your MB support both, as some do, then you'll have to.