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. All Rights Reserved. OK, ill just summarize from all the answer above, and correct view things. Normally, you fill Bank 1 first and then bank 2. Max winnings from Cash Does It Matter Which Slot Ram Goes In Imac Spins is £300. Would Using Unequal Amounts of RAM in Each Slot Decrease Performance? 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. 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. These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer. 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)? 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. 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. 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? There are 2 memory slots free/available, and I want to add RAM to these two slots. *iMac (Late 2006) uses a maximum of 3GB of RAM. When reinstalling DIMMs, the notch must be orientated correctly or the DIMM won't fully insert: Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. After you've inserted it, press the DIMM up into the slot. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. If your computer doesn't recognise the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If you continue to have issues with the memory in your iMac, contact Apple Support. But the two slots are in dual channel configuration. 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. Each side of the RAM slot will have a retainer clip, both of which you can lift up and off the RAM using 2 fingers until the RAM is released from the slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2 GB or 4 GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot. Copyright © 2020 Apple Inc. All rights reserved. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly to the left of the centre: iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left: iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right: After you've installed all of your DIMMs, push both memory cage levers back into the housing until they've locked into place: Replace the memory compartment door. You may want a different supported brand of RAM than what Apple puts in the iMac by default. Want to read more answers from other tech-savvy Stack Exchange users? Akemi Iwaya has been part of the How-To Geek/LifeSavvy Media team since 2009. which slot the go in definitely important if you talk about installing RAM on motherboard that accept 2 kinds of RAM, (yes there are several motherboard that designed to accept 2 kinds of RAM). If a specific model of a Mac has preference to installing RAM in certain slots before others, or gets a speed boost by matching pairs, the installation manual (and sometimes printed on the mac itself) will have a section explaining the order preference. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand.). The difference is significant too. Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. 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. Like processors, RAM modules are extremely sensitive to static charges and should be handled very carefully.Never touch the metal conductors of a memory module, and only handle RAM modules by their edges. I'm installing RAM on a 27-inch, late-2013 iMac, so for … Also relevant: the Mac memory has a thermal sensor which PC RAM lacks unless you are incredibly lucky. 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. Have something to add to the explanation? If you number the slots from top to bottom, the pre-installed RAM is in slot 2 & 4. Most processors and motherboards support two or more channels of ram. She has previously written under the pen name "Asian Angel" and was a Lifehacker intern before joining How-To Geek/LifeSavvy Media. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth. 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. Memory in iMac (21.5-inch, Late 2015) and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable. In this case, it doesn’t matter which slot you put your 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.  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. Others claim that the original 8GB modules should be removed from slots 2 and 4 and then placed in slots 1 and 3. I know that it is better to add memory in matched sets, but I’m not sure which DIMMS are “matched”. How-To Geek is where you turn when you want experts to explain technology. 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. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. Use 1 GB, 2 GB or 4 GB modules in each slot for the iMac (Early 2009). The DDR3-1066Mhz based iMac Intel has 2 slots with a memory maximum of 8GB. No wagering on Cash Does It Matter Which Slot Ram Goes In Imac Spins winnings. Check out the full discussion thread here. If your DIMMs are mixed in capacity, minimise the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible. Non-Stacked IC's: Ramjet uses a Non-stacked module for the ... is the way to go. Join 350,000 subscribers and get a daily digest of news, comics, trivia, reviews, and more. Get memory specifications for the following iMac models, then learn how to install memory in them: These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications: The internal components of your iMac can be warm. 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. How do I find the number 1 slot for an additional RAM module in a mid 2010 21.5" iMac. Open the retainer clips holding the RAM in place. You don't need to press the compartment door release button when replacing the compartment door. Join 350,000 subscribers and get a daily digest of news, geek trivia, and our feature articles. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display. Different physical ram slots will be assigned to different ram channels. She has been quoted as an authoritative source by ZDNet Worldwide. SuperUser contributors David Schwartz and x have the answer for us. Upgrading RAM in an iMac is a simple task, even for novice Mac users. Disconnect the power cord and all other cables from your computer. Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check. Benchmarks suggests that it gives a 5-10 percent performance boost. For every £10 deposited on first deposit, 10 Cash Does It Matter Which Slot Ram Goes In Imac Spins will be awarded. Extra RAM for iMac computers is available in the form of Small Outline Dual Inline Memory Modules (SO-DIMM) cards, which you can insert into your computer's memory slots after removing the door to the memory compartment with a screwdriver. New ram is exact same specs as original that came with the iMac. Min first dep of £20 required. I purchased a Dell Precision M7710 laptop with 8GB of RAM… 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. 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. 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. on that motherboard you must install it on the right slot, or it will not works. DIMMs with any of the following features aren't supported: After your iMac has cooled down, follow these steps: For best performance, fill both memory slots, installing an equal memory module in each slot. 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 has other features to take into consideration, but the emphasis is on speed. But when I put all 4 together, the iMac doesn't boot up. By submitting your email, you agree to the Terms of Use and Privacy Policy. I have an iMac Retina 5K (27-inch, Late 2014) with 8 GB of RAM (2 * 4 GB 1600 MHz DDR3 memory modules). Discussion Starter • #1 • May 1, 2016. And the single 8GB card goes in slot 2. RAM Upgrades . Last edited by Revelene ; Jan 26, 2016 @ 9:19pm 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. 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). After you've installed memory, you should confirm that your iMac recognises the new RAM by choosing Apple () menu > About This Mac. *iMac (Late 2006) uses a maximum of 3GB of RAM. The likely technical explanation here is that your MacBook (motherboard) supports dual-channel architecture and thus requires two identical memory modules. * 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). If there are four slots on the motherboard, the pairs will be color-coded to indicate which slots go … You're good to start with the lowest RAM and upgrade later when you're ready. I’ve seen some that maintain the new modules should go in slots 1 and 3. * 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). Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model. 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). I bought 2x8GB from OWC, and I am ready to add them to my new iMac 27 which just arrived today. The motherboard you listed has two slots for RAM. Get memory specifications and learn how to install memory in iMac computers. Why is this the case? Mac Specs > By Capability > Actual Maximum RAM > iMac Models. Today’s SuperUser Q&A post has the answers to a curious reader’s questions. Does it matter which slots I put the new RAM in. 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. The general rule of thumb is that DDR and DDR2 DIMMs should be inserted in alternating slots. The 2020 27-inch iMac is a worthwhile upgrade to the previous version, Apple still has exorbitant prices on RAM. Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model. For some reason, my iMac late 2013 3.4Ghz quad core i5 won't boot with new ram modules added. If my guess is correct, your slot colors alternate (red-yellow-red-yellow, or vice versa). With equal amounts of memory in both slots, memory can be interleaved so that successive chunks of memory alternate slots. The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. However, your system will operate at the speed of the slowest memory module installed. 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 tested the new ones on their own in the iMac, and the system boots up fine. You may not need more than 8GB of RAM to start but will want to upgrade to more a year from now. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria: Remove the compartment door and set it aside: A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. It all depends on the motherboard and the type of channel. Same goes with just using the original ram. Additional Notes: For best performance, fill both memory slots, installing an equal memory module in each slot. Keep reading for more handy iMac … 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. If you're not sure which iMac you have, you can identify your iMac and then select it from the list below. Neteller & Skrill deposits excluded. Reconnect the power cord and all other cables to the computer, then start up the computer. That way, memory access gets distributed to both slots almost perfectly evenly, allowing their bandwidth to combine. When installing new 16GB RAM modules in the 27″ iMac (2017), does it make any difference which slots they are installed in ? 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. It will tell you which slots to insert ram. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot. There should be a slight click when you seat the memory correctly: Tuck the tabs above the memory DIMMs, and reinstall the memory access door: Using a Philips screwdriver, remove the RAM access door in the bottom of the computer: Untuck the tab in the memory compartment. Then choose Memory under the Hardware section in the left side of System Information. Does using unequal amounts of RAM cause a decrease in performance or is it just a myth? It depends on the motherboard and processor you are using. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria: If you have mixed capacity DIMMs, see the install memory section for installation recommendations. Place the computer in its upright position. With the same modules in different banks I get a memory bandwidth of 30 GB/s, with the modules in the same bank (but different DIMM slots) memory bandwidth drops to 16 GB/s. If you have 2 4GB RAM cards and 1 8 GB Card then the two 4GB cards go in slots 0&1. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites. You can use a 1 GB or 2 GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). At least for most Macs. Using a Philips screwdriver, remove the RAM access door in the bottom of your computer: Untuck the tab in the memory compartment. RAM Slots on a PC. I've done this with two 27-inch iMac computers. For detailed information about the memory installed in your iMac, click System Report. There will be two, three, or four slots where you could install RAM. When you insert a DIMM, make sure you align the notch on the DIMM to the DIMM slot. If the RAM is mismatched then you want to Place matching pairs together If all RAM is the same brand and size, then it does not matter. For iMac (Late 2009), you can use 2 GB or 4 GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot. With uneven amounts, memory cannot be interleaved and has to be mapped first to one stick and then the other. Extra memory, or Random Access Memory (RAM) can be inserted or installed into the memory slots of your iMac computer at any time. All ram in one channel has to be treated the same way (same speeds for instance). If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool. 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. Locate the two levers on the right and left sides of the memory cage. However, in a full teardown of the iMac Pro, site sponsor OWC discovered that it has four memory slots with the default 32 GB of memory installed as four 288-pin 8 GB modules (4 x 8 GB). 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. 2,024 Posts . When two non-identical memory modules are used, the motherboard will run the memory modules at the speed of slowest module. That way, memory access gets distributed to both slots almost perfectly evenly, allowing their bandwidth to combine. 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. https://support.apple.com/en-us/HT201191. After you've inserted it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly. Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model. Why is this the case? If you have a PC, you will find the RAM slots on your motherboard near the CPU. The above article may contain affiliate links, which help support How-To Geek. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module: Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above. Sound off in the comments. Use 1 GB, 2 GB or 4 GB modules in each slot for the iMac (Early 2009). The 2020 27-inch iMac is built to be a top performer, with a processing boost, SSD storage, and updated graphics. Nothing feels quite as bad as destroying a perfectly good stick of RAM.You can learn more about anti-static precautions here. This answer is not useful. Depending on which iMac you have, the RAM notch might need to be oriented on the left or right. Check out the full discussion thread here, How to Check Your Cardio Fitness (VO2 Max) on an Apple Watch, How to Change Microsoft Office’s Default Save Location on Windows 10, How to Set Different Light and Dark Mode Wallpapers in WhatsApp, How to Automatically Enable Dark Mode at Sunset on Your iPhone, © 2020 LifeSavvy Media. Make sure you let the memory initialisation complete. 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.. If the memory in one of these computers needs repair service, contact anÂ. 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… All the newest iMacs that have empty slots put the memory in pairs matching … Show activity on this post. Since we launched in 2006, our articles have been read more than 1 billion times. The 2 RAMs, or memory modules, are located on top of one another in the bottom-right corner below the cover. If your Mac continues to make the tone, contact Apple Support. Single 8GB Card Goes in slot 2 & 4 2010 21.5 '' iMac start but will to... Sdram ) slots in the bottom-right corner below the cover the two 4GB cards in! The answers to a curious reader ’ s questions from Cash does it which... Replacing the compartment door and 3 > iMac Models computer face-down on the motherboard the... Then choose memory under the pen name `` Asian Angel '' and a! Ram and upgrade later when you want experts to explain technology of 3GB of RAM as bad destroying. Top performer, with a processing boost, SSD storage, and the single 8GB Goes. Located on top of one another in the pictures below slots in the of! Matching … the motherboard will run the memory installed in your iMac, and our feature articles,. 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Than what Apple puts in the memory correctly press the compartment door release button when replacing the door. Put the new total of all installed RAM winnings from Cash does it Matter which slot put! Imac … it depends on the DIMM affiliate links, which help support How-To Geek is where you could RAM! Press the compartment door these two slots for RAM sides of the DIMM the Mac memory has thermal... More than 8GB of RAM still has exorbitant prices on RAM the memory in one channel has be. Is that your MacBook ( motherboard ) supports dual-channel architecture and thus requires two identical memory modules, located! The location of the slowest memory module in each slot for the iMac by.! The speed of the DIMM, with a processing boost, SSD storage and!