No. DDR2 memory chips and modules are very different from DDR. For example, DDR2 runs at a lower voltage (1.8V) than DDR (2.5V). The notch on DDR2 DIMMs is in a different position than DDR DIMMs. DDR2 is a 240-pin module, DDR is a 184-pin module. Notebooks have 200-pin modules for DDR and DDR2.

No. Memory modules (Unbuffered, Registered, Small Outline DIMMs) have a special “key” or notch in their connector.The notch on DDR2 DIMMs is in a different position than DDR DIMMs. DDR2 is a 240-pin module, DDR is a 184-pin module. Notebooks have 200-pin modules for DDR and DDR2.