GA-6BA |
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Do you have memory for your computer and need help installing it? Check out our site for comprehensive information about installing memory into your computer. No matter what kind of computer you have, we can help. Find here What is the difference between 2-clock and 4-clock memory? Two types of SDRAM modules are the 2-clock and the 4-clock module. Structurally, they are the same, but they are accessed differently. A 2-clock SDRAM module is set up so that each clock cycle accesses two chips on the module. A 4-clock SDRAM setup accesses 4 chips per clock cycle. To choose what kind to get, you must look into the motherboard''s documentation. 4-clock modules are the more commonly used. The typical indication of the wrong type being used is a system giving error beeps and not booting as it cannot use the memory installed. The system will not proceed past POST (Power On Self Test). 2-clock was only used in 66 MHz systems. All PC 100 and PC 133 memory is 4-clock only. Do all of your SDRAM modules use SPD? SPD, or Serial Presence Detect, is a program in an EEPROM chip on the modules of SDRAM (Synchronous Dynamic Random Access Memory). It tells the system’s BIOS what the specifications and settings of the memory module are. All of our SDRAM DIMMs have SPD programming. The system BIOS should therefore be set on AutoDetection for memory. As noted in the introduction, there''s a virtual alphabet soup of memory types: SDRAM, EDO, FPM, SIMM, and DIMM. It certainly can create a great deal of confusion. RAM itself stands for "random access memory," meaning the CPU can access any memory address without reading all addresses before it. (ROM—read only memory—is random access, too, but you can''t write to it). It gets worse, because memory comes in different speeds, and some types don''t work in some systems. Here''s the rundown on the three memory types used in today''s systems.... SDRAM. Synchronous DRAM SDRAM''s speed is typically measured in MHz (for example, 100MHz), although you do see references to 10ns SDRAM ("ns" stands for nanosecond or one billionth of a second). SDRAM for PCs comes in DIMMs. These refer to SDRAM DIMMs rated at different memory bus speeds. For any CPU running at a 100MHz bus speed you should get SDRAM. Some future motherboards will support SDRAM. Although there''s a price premium, SDRAM will run in a PC100 system. |
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