DDR3L modules are backwards compatible with DDR3 by design. Manufacturers use the same integrated circuits for DDR3 and DDR3L. The highest quality ICs are tested for operating at 1.35 volts and are branded as DDR3L if they run properly. Other than that, there’s no difference between them. SuperUser reader Seva wants to know if it is possible to use two types of DDR3 RAM with the same motherboard: I currently have a stick of DDR3 RAM (1333 MHz, 4 GB) in one of the slots on my motherboard (Asus H61M). Memory slots on system boards that support ddr3 are keyed to onlY accept ddr3 modules. Ddr2 will not fit into a ddr3 slot and ddr3 will not fit into a ddr2 slot. Memory configuration DDR memory can run in dual-channel mode, which allows the system to have twice the memory bandwidth using the same memory technology. Hi there, i wonder if my laptop has ddr3 slots. It s hp pavilion dv7-2140ev cpu: q9000 quad core ram: 2x2gb sodimm ddr2 gpu: radeon 4650 1gb i want to upgrade the rams, so i need to know if i can use ddr3 for this and if i can use ddr2 toghether with ddr3 or memories have to be same type. The ram is ddr3, and i found out that ddr3 and ddr4 are physically different, so they wont be able to fit inside the ddr4 memory slots on my motherboard. Is there an existing solution that can conver the ddr3 memory into ddr4 memory so that it can fit in the ddr4 memory slots on my mother board? Thanks in advance.

Are DDR3 and DDR4 laptop memory (RAM) compatible? That’s a common question when it comes to memory upgrades. For instance, you bought a new laptop with DDR4 RAM and want to add more memory to it by inserting a DDR3 RAM module from your older laptop. You wonder if that’s possible. Unfortunately, that can’t be done. DDR3 and DDR4 laptop memory are not compatible / interchangeable.

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First of all, a DDR3 laptop RAM module can’t physically fit into a DDR4 laptop RAM slot and vice versa. Notches on the connectors of memory sticks are on different places. The same applies to corresponding bumps in the RAM slots on notebook’s motherboards. Also, the number of pins doesn’t match. A DDR3 laptop memory module has 204 pins, whereas DDR4 has 260. Finally, DDR3 memory is a bit shorter than DDR4 – 2.66 versus 2.74 inches.

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So, a DDR3 memory module won’t fit in a DDR4 slot…

And a DDR4 stick is incompatible with a DDR3 slot…

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Besides the physical differences, DDR3 and DDR4 RAM differ in voltages. DDR3 uses a voltage of 1.5V (or 1.35V for DDR3L variant). DDR4 uses 1.2V. It is more power efficient and generally faster, but doesn’t noticeably improve overall performance nor battery life of notebooks.

Note: If you see “SODIMM” in specs of both DDR3 and DDR4 laptop memory, that doesn’t mean they are compatible. SODIMM only means they are small memory modules commonly used in laptops and some small form factor PCs, as opposed to physically much bigger DIMM memory used in traditional desktop computers. As a side note, DDR3 and DDR4 DIMMs aren’t compatible neither.