1. Appearance
There is little difference in appearance between the two, generally only by the information on the label and the position of the card slot.
In terms of card slots, DDR4 has a notch closer to the center than DDR3.
In terms of card slots, compared with DDR3, DDR4 has a notch closer to the center, the number of contacts of desktop memory gold fingers has increased from 240 to 284, and the spacing between contacts has been reduced from 1mm to 0.85mm , after all, when the total length remains unchanged (133.35±0.15mm), the spacing becomes smaller when the number increases. The number of gold-finger contacts of memory sticks dedicated to notebooks has been increased from 204 to 256, and the spacing has been reduced from 0.6mm to 0.5mm. There is a slight increase in height, but it is not a parameter that affects the use, and it is generally not considered.
Another very significant feature is that the gold finger of the fourth-generation desktop memory has been changed in the horizontal direction. It is no longer a straight line, but slightly curved, that is, the middle is slightly longer and the ends are slightly shorter. This design Mainly to make it easier to insert and unplug the memory stick. However, the memory cheat of the notebook does not have such a design. After all, the memory of the notebook rarely has the situation of plugging and unplugging.
2. Capacity
In terms of capacity, the regular specifications of the ddr3 and ddr4 generations are 4G and 8G, 8G and 16G respectively.
DS technology (3-Dimensional Stack, three-dimensional stacking) is one of the most critical technologies in DDR4 memory. It is used to increase the capacity of a single chip. In theory, the maximum single chip is 128G, but it has not been implemented in consumer products. Moreover, the larger the capacity, the higher the corresponding price, which is unbearable for ordinary consumers, and with the increasing demand for memory capacity by systems and applications, the two main capacities currently in circulation on the market are 8GB and 16GB. Specifications, 4G capacity ddr3 memory are gradually withdrawing from the market.
3. Frequency
Frequency has always been one of the important parameters of memory products. When purchasing memory, most users look at capacity first and frequency second. After all, frequency is an important manifestation of performance. The frequency of ddr3 has been familiar to us in the past. When we see these numbers, we will immediately think of the frequency of memory, from 800, 1066 in the early stage to 1333, 1600 in the middle stage, and then 1866, 2133, 2400 in the later stage, ddr3 Memory can be said to have been with us for nearly 10 years, but generally 2133 and 2400 exist in the field of overclocking.
For ddr4 memory, the frequency starts at 2133. The current common frequencies are 2133, 2400, 2666, 2800, 3000, and 3200. The mainstream consumer-level frequencies are concentrated in the two frequencies of 2133 and 2400, 3000+ It basically exists in the field of overclocking, and such a high frequency is simply not used for daily needs.
4. Voltage
In terms of voltage, the voltage of memory products is decreasing all the way. The common working voltage is shown in the table below.
DDR3 1.5V
DDR3L 1.35V/1.28V
DDR4 1.2V
It can be said that the development history of memory is a history of step-down, from 2.5V of DDR to 1.8V of DDR2 to 1.5V of DDR3 and then to 1.2V of DDR4. At present, DDR5 has come out, and its voltage is 1.1V
