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The type of RAM that is embedded on the card will have a significant effect on the card's performance. Briefly, there are descriptions of some types, below. DDR Double-Data Rate RAM essentially doubles the rate of standard SDRAM. Any DDR RAM will be quicker (and probably more expensive) than its non-DDR counterpart. EDO RAM EDO RAM is a type of DRAM is faster access times. EDO RAM is generally slower than SDRAM. RDRAM RDRAM basically doubles the output of SDRAM and also moves the data faster. This is a high-end variant of RAM. SDRAM This is a high performance, faster variant on some other types of RAM. The S stands for "synchronous" because it uses a new technology to send spurts of data at specific intervals of time. SGRAM This is a graphics-specific type of memory used in high-end graphics cards. This type of memory sends data in blocks so that graphics appear less choppy when read.

Bus Clock Rate, or clock speed, is one way of measuring the overall speed of your RAM. Generally, the faster the speed the faster you will notice your computer working. When using SDRAM, if you match the clock speed to the bus speed of your computer's processor, it will increase the speed performance.

CAS is Column Address Strobe or Column Address Select. CAS controls the amount of time (in cycles (2, 2.5,& 3) between receiving a command and acting on that command. Since CAS primarily controls the location of HEX addresses, or memory columns, within the memory matrix, this is the most important timing to set as low as your system will stably accept it. There are both rows and columns inside a memory matrix. Since CAS is the last stage in actually finding the proper data, it's the most important step of memory timing.

Form Factor describes the way RAM will integrate with your computer. Make sure that the memory you buy is compatible with the memory slots in your computer.