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The so-called Small Outline Dual Inline Memory Modules (SODIMMs) with 204 contacts are a special form designed for DDR3 memory modules in laptops and other computer platforms with limited space. To use DDR3 memory, your system requires a SODIMM slot with 204 contacts and a chipset that supports DDR3. DDR3 SODIMMs do not fit into DDR2 or DDR slots. SODIMMs are smaller and thinner than standard DIMMs, and the SODIMM PCBs with 204 contacts are always approximately 6.60 cm long and typically about 3.00 cm high (the height may vary slightly). They consist of several memory components (usually black) mounted on a printed circuit board (usually green). The number of memory components on the printed circuit boards of the 204-contact SODIMMs can vary, but the modules always have 102 contacts on both the front and back, totaling 204. The gold contacts on the underside of the SODIMM connect the memory module to the corresponding slot.