Remove the compartment door and set it aside:

The memory compartment door will open as the button is pushed in.

Open the memory compartment door by pressing the small grey button located just above the AC power port:.

Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.

Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.

Disconnect the power cord and all other cables from your computer.

If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.Īfter you shut down your iMac and give it time to cool, follow these steps:

You have the right memory (DDR two matched units) and you are running single more just because of incorrect memory placement.The internal components of your iMac can be warm. Suitable slot pairs are usually colored the same to remind you about this. The board is wired to use them in dual-channel mode correctly on these placements. If you have a motherboard with 4 slots, and you own two similar memory sticks compatible with your board, it is critical to place them on the correct two slots (usually alternate slots). at the same time.īecause the two modules are accessed at the same time, they must be identical (same capacity, same timings and same clock rate).įinally, this is described with more words in the article, In other words, dual channel works by accessing two memory modules in parallel, i.e.

If you install just one module this technique won’t work because memory will still be accessed 64 bits per cycle. Because of that they achieve double the transfer rate compared to traditional memories (such as the original SDRAM) running at the same clock rate.įor dual-channel technology to work you need to have an even number of memory modules on your system (assuming that your AMD CPU or Intel chipset support this technology, of course). Memories based on DDR (Double Data Rate) technology such as DDR-SDRAM, DDR2-SDRAM and DDR3-SDRAM transfer two data per clock cycle. Considering that everything remains the same (clock speeds, for example), the memory maximum theoretical transfer rate is doubled by the use of this technique.

Alternate is not right here.Ī good article discussing Dual-Channel RAM,Įverything You Need to Know About Dual Channelĭual channel is the ability that some memory controllers have to expand the width of their data busses from 64 to 128 bits. Looking at your board it appears that Slot#1 and Slot#2 (colored black?) should be used for the memory - this ASUS board has 3 memory slots instead of the usual 4 and they are organized differently.

What slot does ram go in ddr2