You don't know how to read memory

In recent days, there have been a lot of small message comments on the installed machine-related content that have been pushed, and many of them have asked questions about memory. In fact, since the sixth generation of Core processors, it has been changed to the latest DDR4 memory, but until this year, DDR4 has become popular, including Intel's seventh-generation Core processor, and AMD's Ruilong processing. The device uses DDR4 memory as standard. Today, Xiao Bian has been pushing content on the question of memory for the buddies in the recent period to help everyone understand the relevant knowledge of memory.

There are differences between DDR3 and DDR4

First of all, DDR3, DDR4 technology should be inherited before and after the relationship, but not the same, from the appearance point of view, there is a relatively large difference in memory itself. Putting a picture here will allow everyone to understand the difference in appearance between them. The difference in the position of the golden finger is the biggest difference. The biggest benefit 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, let users not have to worry about plugging in the wrong one.

The secret of frequency you absolutely do not know

In addition to the difference in appearance, there are differences in the frequency of DDR3 and DDR4. Here, we must also mention that the so-called "frequency" actually means "equivalent frequency", and the actual physical frequency is not as high as nominal. Take DDR3 1600, first, the memory core frequency is not as high as only 200MHz (you, no. Look, wrong), and the nominal 1600 is only because of the multiple transmission of data (equivalent) at a time, it does not mean it runs in 1600MHz frequency; DDR4 2400 memory core operating frequency of 300MHz, equivalent to 2400, in fact, we 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 several specifications, including DDR4 2400 is the current mainstream products, in the purchase of memory, if it is not overclocking players, DDR4 2400 is sufficient (DDR4 2133 is close to elimination , the price has no advantage).

Both are different in memory voltage

Another difference is the voltage. From DDR1 2.5V voltage to DDR2 1.8V voltage, DDR3 has become 1.5V voltage, but later due to the needs of equipment such as Ultrabook, DDR3 further evolved into DDR3L (low voltage version) 1.35V, to The era of DDR4 directly became 1.2V. Lower voltages represent lower power consumption, but they have higher frequencies and higher equivalent performance. Why is this? Everyone always says that the XX nanometer process technology has shown its value here. More advanced process technology can greatly improve the leakage problem (on-chip, not at home) and increase the power/performance ratio. This is why the process process is constantly evolving.

Memory bandwidth determines performance

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

Take the dual-channel memory technology as an example. Dual-channel performance will release the processor's performance. Maybe many people will ask what is the dual channel, Xiao Bian simply summarizes, paired memory installation is dual channel. At different times, even if the home motherboard has four memory slots, even if it is full of memory, it is only dual-channel, because the processor can only provide dual-channel memory specifications, only the high-end processor will integrate four-channel design.

Dual channels can theoretically increase the bandwidth by two times, but in fact the two channels will also have discounts, including the delay will also affect the performance of the theoretical maximum performance and so on, but even so it is much better than the performance of a single channel.

Of course, some motherboards have special technologies, such as more than the CPU controller memory support, in fact, the motherboard has done an asynchronous memory processing, which allows overclockers to use a higher specification of memory to obtain better memory bandwidth performance. However, for the average user, DDR3/L 1600 and DDR4 2400 are "memory standard" for a period of time (DDR3 will be eliminated next year, DDR4 mainstream products will gradually upgrade to DDR4 2666).