Interesting, your ASRock is a crossover board, it supports both DDR2 & DDR3 memory:
However, you need to note that it only supports up to 95W AM2/AM2+/AM3 CPU's.
The 940 is a 125W CPU, so I would not recommend using it on this board.
Besides, the 940 IMC only supports DDR2 memory.
You will need a AM3 CPU (like the 955) to run DDR3 memory.
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