【 Weak current college 】 system hardware to cope with large memory usage notes

Memory prices make many friends in the machine is configured with 512MB even 1 GB of large-capacity memory, large-capacity memory can let the program run more stable, more rapid data transfer, but a lot of friends in the use of large-capacity memory when it encountered problems. Common scenarios are summarized below:

1. the operating system does not support

While entering the era of the motherboard after P4 support 1GB above large capacity memory, Windows98/Me, however, the operating system for large-capacity memory support but there were some problems. Reflected in the use of 512MB even greater amount of memory, the system will prompt is not enough memory or system stops responding during startup, even if access to the system will also appear when playing video and music files can not be silent, normal use MS-DOS mode, and so on!

The reason for this lies in Windows95/98 (SE)/Me lower such version of the operating system memory management problems. Windows32-bit protected-mode cache (Vcache) drivers are based on Windows startup, the amount of physical memory to determine the maximum cache size. Then, Vcache would leave enough memory address, to allow it to access a maximum capacity of the cache. So, if required, it can increase the cache size. With a large number of physical memory in the computer, the maximum cache size is large enough, resulting in Vcache uses system existential all addresses in the block, and not for other functions (for example, create a new virtual machine to open the MS-DOS prompt) to stay out of the available virtual memory address. The results led to the emergence of the problem. The solution is to modify the Windows folder of the system.ini file, locate the [vcache] project, add the following:

[vcache]
MinFileCache=1048576
MaxFileCache=1048576

Save the exit you can use the large capacity memory.

Note: in Windows2000 and above, this problem does not exist.

2. the Board is not compatible with memory

L technical NF7-S motherboard and memory exist incompatibilities, the phenomenon is not functioning at the same time using two 512MB memory, use the run program when it is not a mistake, just play the game quits automatically when running 3DMark etc test software also does not pass. But single plug in one of the memory is good. Certain other nForce2 chipset motherboard brand and also more or less present i865PE motherboard.

Solutions include the following:

A is for memory and voltage. Enter the BIOS to memory and voltage to adapt to other hardware requirements. But it should be noted that, in the memory specifications, the criteria for DDR266 and DDR333 is working, and DDR400 2.5V standard operating voltage is 2.6V, so when you want to increase voltage reference pressure, not more than too much (10% most insurance), otherwise easily lead to system instability or even lead to the destruction of memory.

Second, adjusting the memory parameters to match. Memory parameters including RASPrechargeTime (last column addressing end-to-start next column addressed), RAMActiveTime (meaning Yes when the CPU information from Bank1 looking for and to read the data, and Bank2 Bank1 rest time), and includes such parameters as RAStoCASDelay, CASLatency. Which RASPrechargeTime can set to 7 or 8, RAMActiveTime is set to 3 or 4, RAStoCASDelay set to 3 or 4, CASLatency set to 2.5 or 3. When two memory is not the same as the brand or the same brand of different frequencies, you can follow the specification low memory parameters are set.

3. old motherboard does not support

Previous Board, many do not support large capacity memory, like the Intel 810, 815 series motherboards, the maximum you can only use 512MB memory. When physical memory exceeds 512MB occurs does not correctly identify the situation. In this case use the large capacity memory only qualified within the 512MB.