Source: PCONLINE: ROACH Date: 2005-03-06
We know that the motherboard is played in a computer, and the support, the graphics card is relatively independent. They do not have much relationship with too much configuration rate, only the data rate between the CPU and the memory is the most close, it is one Whether the computer is configured to configure a reasonable focus. And in a computer, whether it can truly play, extract the entire performance of the CPU, and mainly depends on memory. Therefore, whether the rate and bandwidth of the CPU and the memory cooperate, directly affect the speed of data exchange between the two, that is, the performance of the computer plays a crucial role. In addition, we also know that there is a bus bandwidth between CPU and memory, which is the capacity and scope of data transmission between them. When we configure your computer, we should try to make both bus bandwidths (equal). Among them, the bus bandwidth of the CPU and memory can be calculated from its basic data (Note: These data can be found from the instructions or online query, or can be obtained in hardware test software such as EVEREST shown in Figure 1), The calculation method of the CPU bus bandwidth is "Overseofer × N times speed × 64-bit total line width / 8", and the bus bandwidth method of memory is "data packets in the bus width × one clock cycle exchange data package number × bus frequency". For example, the race D series CPU of the outer frequency is 133 MHz, its front-end bus (FSB) is 533 MHz (with 4 times speed), while the bus bandwidth is 4.2Gb / s (533 × 64/8). The bus bandwidth of single-channel DDR400 (200 MHz Outer Frequency × 2 Data Exchange) is 3.2Gb / s (400 MHz × 8 bus frequencies). From this, we can analyze the data transfer rate between the CPU and memory, and know if the CPU with a 533MHz FSB is matched with a single channel DDR400 memory, you cannot fully let the CPU all performance. This is more suitable for DDR266 memory with a dual channel (bus bandwidth is just 4.2Gb / s). However, here prompted, we can't forget the configuration relationship of 100: 133 in order to pursue the bus bandwidth between the CPU and the memory. For example, the DDR400 memory that cannot be used as an outer frequency of 100 MHz is configured. In fact, the calculation of bus bandwidth between CPU and memory is also too theoretical. Many times the memory is slightly low or slightly higher, and the same CPU is not affected, and the CPU and memory used are considered. The overall performance is fixed. Of course, if there is conditional, it is best to try to make the bus bandwidth between the CPU and the memory, after all, this is a very important indicator of the excellent data rate of data rates.
