But just what are the pros and cons of DDR2 and DDR3? Is it desirable or even possible to upgrade from the former to the latter? The first thing to appreciate is that the two memory types are completely incompatible with each other. Everything from voltages to timings and signalling is different.
Fortunately, they're physically incompatible, too. A repositioning of the slotted groove on DDR3 sticks and sockets means you can't accidentally insert the wrong memory into you motherboard. Of course, a change of physical form factor also means the minimum requirement for changing memory types is a new motherboard.
However, you may need a new CPU, too. Some Intel CPUs for the LGA775 processor socket from the Core 2 era are compatible with both DDR2 and DDR3. Likewise AMD processors for the AM3 socket are DDR3 compliant and some will also drop into older AM2 boards and work happily with DDR2 memory. To find out whether you can hold onto your processor, check the product information at www.amd.com and www.intel.com.
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