DDR SDRAM has one notch and uses 184 pins.
Peripheral Wrong dumbo, it is a SERIAL BUS
No. SDRAM and DDR SDRAM are not compatible with each other.
While I'm sure a destructive lunatic could force a DDR module into an older slot, they are not designed to be physically compatible. DDR modules have only a single notch, while SDR modules and slots are keyed with two notches and ridges.
The term DDR SDRAM refers to the phrase "double data rate synchronous dynamic random access memory". DDR SDRAM is simply a faster version of SDRAM in which data travels at a double rate. If your computer specs say that it uses DDR SDRAM it can take DDR SDRAM, but not SDRAM. DDR is 184 pins and has a notch in the bottom near the center and you will be unable to put DDR in an SDRAM mother board and also unable to put SDRAM in a DDR motherboard. Recently a new type of RAM has been introduced to market called DDR2. DDR2 is its own type and will not fit into a DDR motherboard. Hope this helps. Peace.
DDR SDRAM uses 184 pins.
No.
No. SDRAM has two notches and DDR SDRAM has only one so besides all the electrical incompatibilities it won't physically fit.
In order to upgrade SDRAM with DDR, you will need to replace your motherboard. DDR uses a different slot than SDRAM, so if your motherboard is using SDRAM currently, you will most likely have to replace your motherboard in order to make your system support DDR.
DDR Memory modules have only one notch on the contact strip, positioned just off-centre. Hence DDR modules will not fit in an SD slot. SD Memory Modules have two notches.
No.
Data path widths for DDR SDRAM can be at least 8, 16, 32, 64 and 72 bits, according to a DDR SDRAM contoller chip manufacturer.