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Also question is, does RAM speed matter for compatibility?

Memory speeds and compatability. Memory is designed to be backward compatible within its generation, so generally speaking, you can safely add faster memory to a computer that was designed to run slower memory. However, your system will operate at the speed of the slowest memory module installed.

Likewise, what happens if you use incompatible RAM? Short Answer: It won't work, below is why. DDR, DDR2, 3 and 4 will have different notches, so its impossible to place incompatible ram in the wrong spot, unless you force it in which is a big no, no. Depending how old you system is, it could be ddr2.

Accordingly, is RAM compatible with any motherboard?

No Mix and Match. Because of their different pin configurations, RAM chips are not a mix and match type of thing. If your motherboard is designed for DDR3 RAM, that's the only type that will fit in the memory slots. Motherboard memory slots are integrated into the board itself and cannot be swapped out.

What is RAM compatibility?

System and RAM Compatibility. A memory upgrade is one of the easiest and most affordable ways to improve the performance of your system. For memory to work on your system, it must be compatible with your motherboard. We'll show you how to get RAM that your motherboard will support.