A DDR2 memory stick cannot be installed correctly in a DDR slot.
Memory Ram
the different notch positions keep someone from installing a DDR DIMM or DDR2 DIMM in the wrong memory slot.
The Slot layout.
I just put a PC2 6400 in the slot that had DDR2 533. The motherboard beeped when I turned the computer on. This beeping is an indication that the memory is not installed. Therefore in my case the answer is no.
Memory Type: DDR2 PC2-6400, DDR2 PC2-8500, DDR2 (non-ECC)Maximum Memory: 8GBSlots: 4Each memory slot can hold DDR2 PC2-6400, DDR2 PC2-8500 with a maximum of 2GB per slot.
No
They are physically notched different, so that one cannot be firmly seated or inserted into the other.
DDR2 PC2-4200,DDR2 PC2-5300,DDR2 PC2-6400 with a maximum of 1GB per slot (equals 4GB max total system memory)
No DDR2 and DDR are not compatible and so you can not add DDR2 RAM module in a DDR Slot. Electrical specifications like voltage, signal pinout and even mechanical size and shape of modules are different.
Generally speaking, yes. The memory will simply be accessed at the slower speed. However, do not mix memory modules of different speeds. Also do not mix non-ECC and ECC memory modules.
There is a notch that prevents installation, even though the modules are the same size and have the same number of pins. Notch position between DDR and DDR2 are diferent. Also, the memory socket on a motherboard is diferent for all types of memories. If the memory socket is design for DDR you can't put any other memory type but DDR and so for all other types.
No. A motherboard will specify what type of memory it supports. The DIMM slot for DDR,DDR2 and DDR3 have different footprints.