What Slots Should My Ram Go In

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Adding additional RAM memory to computer had been always one of the easiest and efficient upgrades. Over years with baggage of hardware generations and new technologies it can get tricky.

  • Jan 06, 2015 Hi, I got a new computer with a Asrock z97 Anniversary mobo, I put my RAM in slots A2 and B2, does it matter? Will it have any performance decreases or problems if I use these slots instead of A1 and B1. I would prefer not to move it as otherwise my CPU cooler will not fit.
  • Jan 26, 2016 Read your motherboard manual. It will tell you which slots to insert ram. It all depends on the motherboard and the type of channel. For example, if your motherboard is dual channel and you use a single stick or put 2 sticks in the wrong slots, you will not get the performance benefit of dual channel.

Pro tip: if it doesn’t click into place the first time, you should take the RAM stick out and double check to make sure it’s in the right way. If you try to force a RAM stick into the slot incorrectly, it could harm the motherboard. Those RAM sticks should be installed so that you have at least one stick in each channel. The best thing you can do here is place your RAM sticks according to what your motherboard manual says. Though the slots are usually color-coded, this isn’t always the case, so check that motherboard manual.

When installing memory it’s not important what to do, but more important to do it right

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Choose memory

There are two main factors in memory: type and speed.

By type most of it is one of DDR, DDR2 or DDR3 (unless you are looking at really old computer). Memory of different types is not compatible mechanically or electronically. Motherboards usually have slots for one specific kind of memory, some rare models can support memory of two types (but not at the same time).

Speed of memory is faster for newer types, but also differs in margins of every type. Motherboards might only support slower speed than memory can come with. Memory of different speeds will in general work with any motherboard of required type. Slow memory will work at its speed even if motherboard can go faster. Fast memory will slow down to match motherboard if needed.

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So you need memory that matches motherboard in type and (best case) speed. If adding memory it is also good idea that new modules match old ones in parameters and brand.

Manufacturers always provide (in manual and online) information on what memory motherboard supports and larger brands even offer lists of practically tested modules for each motherboard.

Choose slots

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What Slots Should My Ram Go In

I remember times when you just had to stick modules in, but those are gone.

Currently most of motherboards/processor combos support at least two memory channels. I think there are already rare (for now) configurations with three channels.

Different channels correspond to different physical slots on board. The idea is that memory must be balanced between channels and that requires them to be filled in specific order.

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Motherboard manual has diagram of slot channels and numbers. For example like this one:

Letter commonly refer to channel, numbers commonly refer to order inside channel. In usual case (when manual doesn’t have other explicit instructions) slots must be filled in following order:

  1. First slot of first channel (A1 in example)
  2. First slot of second channel (B1)
  3. Second slot of first channel (A2)
  4. Second slot of second channel (B2)
  5. And so on.
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If you need to install multiply modules it is best to add them one by one.

Overall

Installing memory is not hard, but my advice is to have motherboard manual open and ready. Those slots rarely come in any kind of sane order. I had recently upgraded computer for a friend and it took me five attempts to get kit of 3x2GB memory modules working correctly.

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