How to Check RAM Parallelism
Parallel memory, also often referred to as "dual-channel memory," allows a computer to access two memory modules simultaneously, in parallel, theoretically doubling the speed at which a computer can access information stored in memory. Parallel memory, however, is a motherboard feature, not a particular kind of memory. All memory can be accessed through dual channels if the motherboard is so equipped and the computer is configured correctly. To check for dual-channel memory, you must first check your motherboard. The instructions below are for desktop computers only. Check your user's manual if you have a laptop computer.
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Instructions
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Examing your motherboard
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Turn off and unplug your computer. Place it in an uncarpeted, static-free environment such as on a dining room table or kitchen counter.
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Open the computer and look for memory modules. These are small cards, around 1/2" x 2", that are set into slots on the motherboard. They typically have a row of flat blocks (chips) on each side of the card.
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You will have 1-4 memory modules and 1-4 memory slots. Look at a slot where the current memory is installed, then look for similar slots next to it. If you have less than four memory slots, your motherboard probably does not support dual-channel memory.
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If you have four memory slots, look at how they are arranged and whether any of the slots are color coded. If two slots are marked with a certain color and the other two with another color, then the motherboard probably supports dual-channel memory.
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In order for dual-channel memory to be used, both paired slots must be occupied by matching memory. If you have two memory modules, one in a slot of a colored pair and the other in a slot of the other colored pair, then your computer is not using dual-channel memory. If two memory modules share paired slots, then your computer is likely using this feature.
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Memory in paired slots should be matched based on capacity, speed and number of chips and sides. Most manufacturers sell memory in matched-pair kits for use in systems that support dual-channel memory.
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Tips & Warnings
A user manual should indicate whether your motherboard supports dual-channel memory, saving you the trouble of opening your computer. Look for this online if you can't find the manual that came with your computer.
Dual-channel memory may not improve performance if other system bottlenecks exist.
Always check the warranty terms before opening a computer.
