It's not easy to understand the memory before placing an order when the price is reduced!

After experiencing a huge surge in memory, the price of memory nowadays has fallen to a good level. However, I found that many friends still have a little knowledge of memory, so I might as well share with you today. In fact, the latest DDR4 memory has been used since the sixth-generation Core processor, but it was not until this year that DDR4 has gained popularity, including Intel’s eighth-generation Core processor and AMD’s Ryzen processor. The devices all use DDR4 memory as standard.

There is a big difference between DDR3 and DDR4

First of all, DDR3 and DDR4 are technically inherited, but they are not the same. From the appearance, the memory itself is quite different. Post a picture here to let everyone understand the difference in appearance between them-the difference in the position of the notch of the golden finger is the biggest difference. In fact, the biggest advantage of this design difference is to prevent confusion of memory specifications, and DDR3 memory cannot be inserted. Motherboards that support DDR4 memory, and vice versa, allow users to not worry about plugging in the wrong way.

You never know the mystery of frequency

In addition to the difference in appearance, there are also differences in frequency between DDR3 and DDR4. It should also be mentioned here that the so-called "frequency" actually refers to the "equivalent frequency", and the actual physical frequency is not as high as the nominal one. Take DDR3 1600 as an example. First of all, the memory core frequency is not so high, only 200MHz (you. No. Read. Wrong), and the nominal 1600 is just because it transmits multiple data at a time (equivalent), it does not mean that it is running at At 1600MHz; the DDR4 2400 memory core operating frequency is 300MHz, which is equivalent to 2400. In fact, you can see that no one will write DDR4 2400MHz, because this is only the equivalent of 2400 frequency, not the physical operating frequency.

At present, DDR3 is mainly 1600 specifications, DDR4 has 2133, 2400, 2666 specifications, of which DDR4 2400 is the current mainstream product. When buying memory, if you are not an overclocker, DDR4 2400 is enough (DDR4 2133 is on the verge of being eliminated , The price has no advantage).

The memory voltage is very different

Another difference is the voltage. From the 2.5V voltage of DDR1 to the 1.8V voltage of DDR2, the voltage of DDR3 has become 1.5V. However, due to the needs of ultrabooks and other equipment, DDR3 has further evolved into DDR3L (low voltage version) 1.35V. In the DDR4 era, it has directly become 1.2V. Lower voltage means lower power consumption, but it also has higher frequency and higher equivalent performance. Why? The XX nano process technology that everyone usually talks about shows its value here. More advanced process technology can greatly improve the leakage problem (in the chip, not the mains at home), and improve the power consumption/performance ratio, so this is the fundamental reason why the process technology is constantly evolving.

Memory bandwidth determines performance

Memory bandwidth is closely related to the capabilities of the processor. What kind of memory controller the processor provides not only determines the specifications of the supported memory, but also determines the maximum upper limit of the memory bandwidth.

Take dual-channel memory technology as an example. The performance of dual-channel will release the performance of the processor. Many people may ask what is dual-channel, I briefly summarized, the paired memory installation method is dual-channel. At the same time, even if the home motherboard has four memory slots, even if the memory is full, it is only dual-channel, because the processor can only provide dual-channel memory technical specifications, and only high-end processors will integrate a four-channel design.

Dual-channel theoretically can increase the bandwidth by twice, but in fact dual-channel will also have a discount, including delay will affect the performance of the theoretical maximum performance, etc., but even so, the performance is much better than single-channel.

Of course, some motherboards have special technologies, such as exceeding the memory support range of the CPU controller. In fact, the motherboard does an asynchronous memory processing, so that overclockers can use higher specifications of memory to obtain better memory bandwidth performance. However, for general users, DDR3/L 1600 and DDR4 2400 are both "standard memory configurations" for a period of time.