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If you have the 27" iMac MacTracker says it supports up to 32GB, even though Apple only says it supports 16GB. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.DIMMs with any of the following features aren't supported:After your iMac cools down, follow these steps: Save money by trading in the original memory chips for a cash rebate. I installed 32 gb ram in my mid 2011 iMac 2.7 GHz without issues it addresses 32 gb/recognizes it. Only 3 left in stock - order soon. However, the type of 204-pin SO-DIMM and the actual maximum capacity varies.These identifiers for each of these 21.5-Inch and 27-Inch iMac models follow:Apple kindly provide silkscreened pictures that cover the RAM upgrade steps on the bottom of the iMac "foot" itself and these images should be reviewed before proceeding with the RAM upgrade.RAM Types & Actual Maximum RAM CapacitiesThe process basically consists of (1) place a soft towel (or anti-static mat) on a table or other flat surface, (2) place the iMac "face down" on its display on top of the towel or anti-static mat, (3) unscrew the access panel on the bottom of the display edge, and (4) change out the SO-DIMMs.From watching the video, it should be clear that upgrading the RAM in these models is simple. The K2100M is the other 'classic' … To subscribe to this RSS feed, copy and paste this URL into your RSS reader.You can check out your specific iMac by finding it on this list, then checking out the RAM section:All 2011 iMacs will support 32GB unofficially except for the late 2011 iMac "Core i3" 3.1 21.5-Inch (MC978LL/A - iMac12,1 - A1311 - 2496) which appears to be capped by EFI at 8GB.Note that Apple may update the EFI at any time and enforce it's stated maximum RAM, and of course Apple won't support going above the maximum RAM.I just bought an iMac and want to max out the memory on the machine. I have received two conflicting answers to my question so I'm bringing it to the community.Also keep in mind that you have to match Apple's memory timing specifications for new memory very carefully. This iMac model feature Synchronous Dynamic Random-Access Memory (SDRAM) slots near the bottom of the computer with these memory specifications:These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.Get memory specifications and learn how to install memory in iMac computers.After you shut down your iMac and give it time to cool, follow these steps:The maximum amount of random-access memory (RAM) you can install in each computer is:These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots near the bottom of the computer with these memory specifications: Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). As suggested by @TwoH, have a look at the 2011 iMac graphic card upgrade thread, which is very detailed and thorough.You said you wanted to replace the GPU anyway - as you have a 27" machine, the Quadro K4100M - for which a new bios has just been produced by @nikey22 - looks a very good bet, though prices may have gone up.