Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria: i5 and i7 Quad Core iMac computers come with both top memory slots populated. When you are adding RAM to a computer, does it really matter if the sticks have unequal amounts of memory or do you always need them to have equal amounts of memory? Max winnings from Cash Does It Matter Which Slot Ram Goes In Imac Spins is £300. Regardless of the fact that the 27” version of the iMac does not solder the RAM down and you are able to replace it, if you do not install RAM approved by Apple you could still void the warranty on your iMac. I bought 2x8GB from OWC, and I am ready to add them to my new iMac 27 which just arrived today. Does using unequal amounts of RAM cause a decrease in performance or is it just a myth? If my guess is correct, your slot colors alternate (red-yellow-red-yellow, or vice versa). All Rights Reserved. Keep reading for more handy iMac … Akemi Iwaya has been part of the How-To Geek/LifeSavvy Media team since 2009. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. You may want a different supported brand of RAM than what Apple puts in the iMac by default. Make sure you let the memory initialisation complete. I'm installing RAM on a 27-inch, late-2013 iMac, so for … If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorised Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorised Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorised Service Provider offers memory upgrade services. Join 350,000 subscribers and get a daily digest of news, comics, trivia, reviews, and more. And the single 8GB card goes in slot 2. She has been quoted as an authoritative source by ZDNet Worldwide. Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model. New ram is exact same specs as original that came with the iMac. Depending on which iMac you have, the RAM notch might need to be oriented on the left or right. If you have 2 4GB RAM cards and 1 8 GB Card then the two 4GB cards go in slots 0&1. For detailed information about the memory installed in your iMac, click System Report. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here. 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. I know that it is better to add memory in matched sets, but I’m not sure which DIMMS are “matched”. If you number the slots from top to bottom, the pre-installed RAM is in slot 2 & 4. If your Mac continues to make the tone, contact Apple Support. After you've shut down your iMac and given it some time to cool down, follow these steps: Your iMac performs a memory initialisation procedure when you first turn it on after upgrading memory or rearranging DIMMs. Please note the CL14 memory does pack a 32GB capacity as you can’t get 3200 CL14 4GB modules, but since World War Z doesn’t require more than 16GB of memory… Apple Retail Store or Apple Authorised Service Provider, Two 512 MB DIMMs; one in each of the memory slots, One DDR2 SDRAM installed into the top slot, Two 256 MB DIMMs; one in each of the memory slots. In this case, it doesn’t matter which slot you put your RAM. Server grade RAM does but usually (in fact 99% of the time) it will be RDRAM or some other variant which has totally different layout and WILL NOT WORK AT ALL in either a PC or Mac. I’ve seen some that maintain the new modules should go in slots 1 and 3. All ram in one channel has to be treated the same way (same speeds for instance). Nothing feels quite as bad as destroying a perfectly good stick of RAM.You can learn more about anti-static precautions here. Upgrading RAM in an iMac is a simple task, even for novice Mac users. First up, David Schwartz: With equal amounts of memory in both slots, memory can be interleaved so that successive chunks of memory alternate slots. It will tell you which slots to insert ram. Mac Specs > By Capability > Actual Maximum RAM > iMac Models. Show activity on this post. This answer is not useful. It depends on the motherboard and processor you are using. on that motherboard you must install it on the right slot, or it will not works. She has previously written under the pen name "Asian Angel" and was a Lifehacker intern before joining How-To Geek/LifeSavvy Media. Non-Stacked IC's: Ramjet uses a Non-stacked module for the ... is the way to go. Other than the obvious decrease in available memory, why would it be worse to run with 6 GB (1*4 GB plus 1*2 GB) than with 8 GB (2*4 GB)? Reconnect the power cord and all other cables to the computer, then start up the computer. Why is this the case? The likely technical explanation here is that your MacBook (motherboard) supports dual-channel architecture and thus requires two identical memory modules. It all depends on the motherboard and the type of channel. This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications: Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria: Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model. Apple placed either two or four memory slots in the base of early iMacs and in the memory bay on the back of later models. RAM Slots on a PC. * Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017) and iMac (Retina 4K, 21.5-inch, 2019). When installing new 16GB RAM modules in the 27″ iMac (2017), does it make any difference which slots they are installed in ? For iMac (Mid 2010) and iMac (Mid 2011), use 2 GB or 4 GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot. I purchased a Dell Precision M7710 laptop with 8GB of RAM… You don't need to press the compartment door release button when replacing the compartment door. But the two slots are in dual channel configuration. After you've inserted it, press the DIMM up into the slot. However, your system will operate at the speed of the slowest memory module installed. A program that is accessing a large contiguous chunk of memory will find almost all of its access going to one stick and there will be no bandwidth combination. Locate the two levers on the right and left sides of the memory cage. The above article may contain affiliate links, which help support How-To Geek. Same goes with just using the original ram. Open the memory compartment door by pressing the small grey button located just above the AC power port: The memory compartment door will open as the button is pushed in. Today’s SuperUser Q&A post has the answers to a curious reader’s questions. The 2 RAMs, or memory modules, are located on top of one another in the bottom-right corner below the cover. Would Using Unequal Amounts of RAM in Each Slot Decrease Performance? Why is this the case? There should be a slight click when you seat the memory correctly. *iMac (Late 2006) uses a maximum of 3GB of RAM. The actual maximum RAM of each iMac is listed below along with its compatible RAM type, default amount of RAM pre-installed, common identifiers suitable to identify a iMac in order to determine its RAM capacity, and more.. Normally, you fill Bank 1 first and then bank 2. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside: Move the DIMM ejector clips to their fully open position: Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM: After you've inserted it, press the DIMM up into the slot with your thumbs. All the newest iMacs that have empty slots put the memory in pairs matching … When you insert a DIMM, make sure you align the notch on the DIMM to the DIMM slot. Pull the two levers on each side of the memory compartment to eject the memory module that's already installed: Remove the memory module from your iMac as shown below: Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM: One tone, repeating every five seconds signals that no RAM is installed. The maximum amount of random-access memory (RAM) you can install in each computer is: You can use a 1 GB or 2 GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory: If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. But when I put all 4 together, the iMac doesn't boot up. Use 1 GB, 2 GB or 4 GB modules in each slot for the iMac (Early 2009). Have something to add to the explanation? Different physical ram slots will be assigned to different ram channels. OK, ill just summarize from all the answer above, and correct view things. With uneven amounts, memory cannot be interleaved and has to be mapped first to one stick and then the other. The basic machine has two 2GB modules installed in the upper slots. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand.). Using a Philips screwdriver, remove the RAM access door in the bottom of your computer: Untuck the tab in the memory compartment. You're good to start with the lowest RAM and upgrade later when you're ready. This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications: For optimal memory performance, DIMMs should be the same capacity, speed and supplier. 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. Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check. Also relevant: the Mac memory has a thermal sensor which PC RAM lacks unless you are incredibly lucky. Additional Notes: For best performance, fill both memory slots, installing an equal memory module in each slot. Use 1 GB, 2 GB or 4 GB modules in each slot for the iMac (Early 2009). 2,024 Posts . That way, memory access gets distributed to both slots almost perfectly evenly, allowing their bandwidth to combine. Most processors and motherboards support two or more channels of ram. In the section for my laptop (13″ Pro, Late 2011), it says: This is not the first time that I have heard of this phenomenon, and it is definitely not specific to Apple. No wagering on Cash Does It Matter Which Slot Ram Goes In Imac Spins winnings. Unfortunately, with Apple ’s all-in-one iMac, installing an SSD is complicated and probably not the best choice for a DIY project; however RAM upgrades are easy. RAM Upgrades . If you have a PC, you will find the RAM slots on your motherboard near the CPU. After you've inserted it, press the DIMM up into the slot. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. https://support.apple.com/en-us/HT201191. After you've installed memory, you should confirm that your iMac recognises the new RAM by choosing Apple () menu > About This Mac. I just upgraded the memory in my 2017 iMac and tests with Geekbench show that the modules should indeed be paired by DIMM slot, not by bank. If you're replacing a memory module, gently pull the tab to eject any installed memory module: Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below. Sound off in the comments. With equal amounts of memory in both slots, memory can be interleaved so that successive chunks of memory alternate slots. *iMac (Late 2006) uses a maximum of 3GB of RAM. With uneven amounts, memory cannot be interleaved and has to be mapped first to one stick and then the other. Benchmarks suggests that it gives a 5-10 percent performance boost. Find your model below for specific installation instructions and notch locations: iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly to the left of the centre. The motherboard you listed has two slots for RAM. Get memory specifications and learn how to install memory in iMac computers. Push the two levers outwards to release the memory cage: After the memory cage has been released, pull the memory cage levers towards you, allowing access to each DIMM slot. There will be two, three, or four slots where you could install RAM. I've done this with two 27-inch iMac computers. Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model. There are 2 memory slots free/available, and I want to add RAM to these two slots. If you're not sure which iMac you have, you can identify your iMac and then select it from the list below. You may not need more than 8GB of RAM to start but will want to upgrade to more a year from now. SuperUser reader LanceLafontaine wants to know if using unequal amounts of RAM really does decrease performance: This page describes the RAM specifications for many of the MacBook laptops. The general rule of thumb is that DDR and DDR2 DIMMs should be inserted in alternating slots. Neteller & Skrill deposits excluded. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Other than the obvious decrease in available memory, why would it be worse to run with 6 GB (1*4 GB plus 1*2 GB) than with 8 GB (2*4 GB). Extra memory, or Random Access Memory (RAM) can be inserted or installed into the memory slots of your iMac computer at any time. You can use a 1 GB or 2 GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). 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