What is the difference between DDR3 and DDR4 memory? Knowledge and precautions for purchasing computer memory
Nowadays, new computers have completely popularized DDR4 memory, which is now the mainstream. Judging from the history of memory development, the development of memory in the past generations has been developed towards high-frequency and low-power consumption, and DDR4 memory is no exception, so what is the difference between DDR3 and DDR4 memory? What are the improvements of DDR4 compared to DDR3 memory? Here is the home of installed machines to help the majority of users come to the knowledge of science.
What is the function of computer memory?
Memory and CPU belong to the bridge relationship. Any program running in the computer must pass through the memory. When we run a program in the computer, the CPU needs to transfer the data calculated by the CPU to the memory for calculation. After the calculation is completed, the CPU will then return the result. Send it out. In layman’s terms, memory is the bridge between CPUs. If the bridge is wider and larger, the cars that can pass by are more and faster.
It is different from the hard disk, but the data stored in the memory is temporary storage. Once the computer is powered off, shut down, or restarted, the data in the memory will be cleared. After the hard disk is powered off, no data will be lost, as long as you don’t delete it. Without formatting, the data is still stored in the hard disk.
What is the difference between DDR3 and DDR4 memory?
1. Capacity changes
DDR4 memory uses differential signaling technology (DiffrentialSignaling) technology and three-dimensional stacking technology (3DS). DDR4 memory uses both the traditional SE signal and the differential signal technology. The traditional SE signal transmission mechanism is susceptible to interference at high frequencies, while the differential signal technology uses two lines to transmit a signal, which greatly increases anti-interference. ability. It is used to increase the capacity of a single chip. After using 3DS stacked packaging technology, the capacity of a single memory can reach up to 8 times that of DDR3 products. For example, the current common large-capacity memory has a single capacity of 8GB (single chip 512MB, a total of 16), while DDR4 can reach 64GB or even 128GB.
2. Memory power consumption
In terms of memory power consumption, the operating voltage of DDR4 memory is further reduced to 1.2V, which is also much lower than the 1.5V operating voltage of DDR3 memory. The reduction in power consumption can reduce the power consumption and heat generation of the memory, so as to improve the stability of the memory module, and there will be basically no frequency reduction caused by heat.
3. Memory frequency and bandwidth
The operating frequency of DDR4 memory starts from 2133MHZ and can be as high as 4266MHZ. Compared with DDR3 memory, the operating frequency and memory timing are greatly improved. Each pin of DDR4 memory can provide 2Gbps (256MB/s) bandwidth, DDR4-3200 is 51.2GB/s, which is more than 70% higher than DDR3-1866.
4. Appearance changes
The gold fingers of previous generations of memory have always been linear. Until the DDR4 memory, the gold fingers are designed to be slightly protruding in the middle, and the edges are shortened. The advantage of this design is to ensure that the gold fingers of DDR4 memory are in contact with the memory slot. The point has enough contact surface to ensure stable signal transmission, and it also solves the problem that the memory is difficult to pull out and difficult to insert. The gap in the middle of the gold finger of DDR4 memory (anti-fuck opening) is closer to the middle than DDR3.
In terms of the number of golden finger contacts, DDR4 memory has 284, while DDR3 memory has 240. The spacing of each contact has been reduced from 1mm to 0.85mm.
Is DDR4 and DDR3 compatible?
Due to the difference in gold finger design between DDR3 and DDR4, and the location of the foolproof port, the two are incompatible.
Learn to distinguish between desktop memory and notebook memory
The size of the memory sticks for notebooks and desktops is different. Desktop memory is longer than notebook memory, as shown in the figure below.
Knowledge and precautions for purchasing computer memory
1. Users who upgrade their computers need to confirm whether their motherboard supports DDR3, DDR4, or even DDR2. Generally speaking, computers in recent years have adopted DDR4 memory. DDR4 or DDR3 memory on the motherboard depends on the type of motherboard slot. Generally, the motherboard slot marked with 1.2V is DDR4 memory, if it is marked with 1.5V, it is DDR3 memory, and the voltages of DDR and DDR2 memory are 2.5V and 1.8V respectively.
2. Choose the appropriate memory capacity according to personal needs. At present, the mainstream memory capacity is 8G, which is sufficient for ordinary users. If you pursue high-performance experience, you need at least 16G, and a professional top-performance platform with at least 32G capacity. If you don’t know how much capacity you need, you can choose 8G memory for the time being, after all, memory upgrades are very convenient.