SDRAM is rated at different speeds. For example a stick of old SDRAM way back in the late 1990s could be labeled PC-100. The 100 equals a maximum speed at which it operates, which is 100 MHz and Since SDRAM only comes in 64-bit modules, as we discussed earlier, it has an 8 byte wide bus, because 64 divided by 8 = 8 So to figure out the total bandwidth of PC-100, you multiply 100 MHz x 8 bytes which equals 800 megabytes per second. So the total Bandwidth of PC-100 equals 800 megabytes per second. So in other words PC-100 RAM can transfer data at a maximum rate of 800 megabytes per second. So an SDRAM module labeled PC-133, you multiply 133 by 8 which = 1066. So the total bandwidth for PC-133 equals 1066 megabytes per second. Now technically 133 x 8 actually equals 1064 But 1066 is accurate because the actual clock speed is 133.3333 x 8, which is rounded off to 1066 Another type of memory was called RDRAM, which was developed by Rambus inc. And they developed the RIMM which stands for Rambus inline memory module. RIMMs have 184 pins and looks similar to DIMMs. With the exception that the bottom notches are located in the center of the module. In 1999 RIMMs were breakthrough in the speed of memory,
No comments:
Post a Comment