The notches simply serve to help make sure you don't put the stick in backwards when installing it onto the motherboard.
Dram and Sdram are two different types of memory.
SDRAM is used for mobiles and SDRAM stands for standard Random Access Memory.
No. SDRAM and DDR SDRAM are not compatible with each other.
No. SDRAM has two notches and DDR SDRAM has only one so besides all the electrical incompatibilities it won't physically fit.
function of sdram
Physical size of the memory card. Mobile sdram is smaller than sdram for desktops.
2.66" 200-pin DDR2 SDRAM 2.66" 200-pin DDR SDRAM 2.66" 144-pin SDRAM 2.35" 72-pin FPM or EDO
No. SDR SDRAM and DDR SDRAM modules are not interchangeable.
1 notch
168-pin SDRAM DIMM
No.
Sdram has one notch. Depending upon the model of Sdram the number of pins it has can vary but a standard Sdram has 184 pins.