Shulou(Shulou.com)06/02 Report--

Memory has a great impact on the performance of the whole machine, and many computers rely on these important memory indicators when running. So, what are the main metrics that affect memory performance?

I. Frequency

In general, the frequency of memory products refers to the transmission frequency, such as "DDR4 3200MHz". Because DDR memory means double rate (Double Data Rate), its core frequency is only half (1600MHz). The same related parameter is the transmission rate (MT/s). When other parameters are constant, the higher the frequency, the better the performance.

Second, bandwidth efficiency (utilization)

Bandwidth efficiency = actual bandwidth / theoretical bandwidth value * 100%. Generally speaking, the larger the bandwidth, the better. Intel 8th and 9th generation CPU dual-channel read and write bandwidth efficiency needs ≥ 90% 95%, replication bandwidth efficiency needs to reach ≥ 80% 85%, below this range belongs to high frequency and low energy

Third, word reading delay time α

α = tCL*2000/ frequency, generally about 7.5~9ns, the smaller the better. Alpha is related to the type of memory particles and physique: the better the granule or physique, the smaller the alpha (Samsung B-die particles perform best at the same voltage). Method of reducing α: ① increased frequency + decreased tCL ② decreased the value of RTL in Traning. According to the above formula, the tCL= α * frequency / 2000 can be used to roughly calculate the range of tCL values at a certain frequency.

Hongwang Semiconductor concluded that no matter what the particle, if the frequency is constant, significantly reducing the tCL value needs to increase the voltage of DIMM, VCCIO and VCCSA; increasing the CPU frequency and Ring frequency is helpful to improve the bandwidth efficiency and reduce the delay.

III. Capacity

Of course, the larger the memory, the better, but it is limited by the maximum capacity supported by the motherboard. The capacity of a single DDR memory is 128MB, 256MB, 512MB, 1GB, 2GB and so on. At least two memory slots are usually provided on the motherboard. If more than one memory is installed, the total memory capacity of the computer is the sum of all memory capacity.

Memory is like a highway, there are two conditions that affect highway capacity: the number of lanes and the speed limit (the more lanes, the more parallel cars, the higher the speed, the stronger the capacity of the highway). The higher the speed (that is, the smaller the memory delay), no matter how wide the highway is, the performance can be improved; but the number of lanes is not certain. When the CPU does not have too many cores and does not need too much memory bandwidth, the performance withdrawal is not obvious (but see the above formula, the higher the memory frequency affects the delay).

Rather than wrestling with memory performance, it is safer to choose a reliable brand. As a senior domestic storage brand, DDR4 SODIMM launched by Hongwang Semiconductor is independently developed and designed by a professional R & D team, with a working voltage of 1.2V, memory timing of 17-17-17, working temperature of 0 ℃ to 70 ℃, 260-pin SODIMM package, high capacity, high performance and reliability guarantee, which can meet the needs of mainstream markets such as computers. DDR4 has 2600 frequency, and ultra-high frequency is more suitable for flattening life. Similarly, there is no need to worry about issues such as compatibility, and there are no problems with mainstream Android, Windows and other platforms.

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