Sorry.. its either / or syndrome. If the motherboard, has DDR then it would be best to utilise this. As it is probably twice as fast as normal SDRam.
SDRAM is used for mobiles and SDRAM stands for standard Random Access Memory.
2.66" 200-pin DDR2 SDRAM 2.66" 200-pin DDR SDRAM 2.66" 144-pin SDRAM 2.35" 72-pin FPM or EDO
Occasionally on older motherboards, there are slots for SDRAM and DDR RAM but, they CANNOT be used at the same time, due to the different speeds they run at.
sdram
184-pin DIMM
Ddr sdram
The calculator on the computer.
168 pins are used on SDRAM DIMM. 184 pins are used on DDR DIMM. There are either 30 pins or 72 pins used on SIMM. 184 pins are used on RIMM.
Common types of DIMM Memory Modules used in computers are a 168 pin SDRAM Module, or a 184 pin DDR SDRAM. These boards are designed to be used in personal computers.
DDR
supplied by webopedia.com Short for Synchronous DRAM, a type of DRAM that can run at much higher clock speeds than conventional memory. SDRAM actually synchronizes itself with the CPU's bus and is capable of running at 133 MHz, about three times faster than conventional FPM RAM, and about twice as fast EDO DRAM and BEDO DRAM. SDRAM is replacing EDO DRAM in many newer computers. SDRAM is a variant of DRAM in which the memory speed is synchronized with the clock pulse from the CPU. This synchronization enables the SDRAM to pipeline read and write requests. Pipelining enables the SDRAM to accept commands at the same time as it is processing other commands. There are three variants of SDRAM: Single Data Rate SDRAM - SDR SDRAM Dual Data Rate SDRAM - DDR SDRAM
DDR2-SDRAM is currently the most commonly used.