Upgrading your iMac's memory yourself is cheaper than going through Apple - TechnW3
While Apple charges a premium for memory (RAM) upgrades on all of its computers, one of the best aspects of the iMac line is that RAM is user-upgradeable — at least on the Intel 27-inch model. This means that you can skip Apple's in-house, expensive RAM upgrades and efficiently perform much more cost-effective ones yourself. Our best memory for Mac choices serves up several excellent third-party RAM upgrades that you can get right now. Enjoy it while you can, because once the transition to Apple silicon is complete, user-upgradeable RAM will most likely be a thing of the past, as none of the current M1 Macs have user-upgradeable RAM.
For later expansion
OWC 16GB DDR4 RAM (Single stick)
Staff Pick
This single-stick kit gives you plenty of room to expand to 32GB or even 64GB in the future should you want to.
128GB for less
Timetec Hynix 128GB DDR4 RAM
This set of four 32GB RAM sticks offers the maximum amount of memory you can put into a Mac for just a fraction of the price of Apple's upgrade option. Perfect for high-end video work and development or opening just a ton of Chrome tabs.
Top tier for most consumers
OWC 32GB DDR4 RAM
A kit of two 16GB RAM sticks from OWC, this is probably the most RAM that any consumer should get for their iMac, and maybe even most pros.
A 32GB alternative
Crucial 32GB DDR4 RAM
Crucial's 32GB RAM kit is a reliable alternative to the OWC sticks, and like that kit, it consists of two 16GB RAM sticks. It's also noticeably less expensive than OWC's gear if you're looking to save some money.
64 with room for more
OWC 64GB DDR4 RAM (2x32GB)
If you're planning on eventually upgrading to 128GB but can deal with 64GB of RAM now, this kit of two 32GB sticks leaves two of your iMac's RAM slots open, so you can get this set again when you're ready to upgrade.
A cheaper way to 64GB
OWC 64GB DDR4 RAM (4x 16GB)
If you need 64GB of RAM but have no plans to expand to 128GB, pick up this four-stick kit to save some money and still get more memory than most people will use.
How to choose the right RAM for your 27-inch Intel iMac
So, why do you want to go with third-party RAM at all instead of buying more RAM when you order your 27-inch iMac? It comes down to cost. For instance, if you need a massive 128GB of RAM in your iMac, it'll run you an additional $2,600 if you choose Apple's upgrade option. Get the Timetec Hynix 128GB RAM set? $647.
When buying a memory upgrade for your iMac, my first piece of advice is the same for any other component: buy the best you can afford. While I would recommend spending money on a better graphics processor or more storage before you buy a RAM upgrade, memory is still worth upgrading if you can.
The exciting news for iMac owners is that you only really need to worry about capacity. The memory that you get for your iMac, and indeed, everything we've recommended, has to have these basic specifications:
- PC4-21333
- Unbuffered
- Nonparity
- 260-pin
- 2666MHz DDR4 SDRAM
Now here's the thing: nobody sells RAM marked with PC4-21333. Instead, you'll find RAM with PC4-21300, but don't worry. This memory is still compatible with your iMac. It has more to do with how some companies round a particular memory value than any actual spec. You shouldn't notice a difference.
As long as the RAM you get follows these specs, the only decision you have to make is about capacity. Every other spec is going to be the same except for the actual amount of memory you get.
When thinking about how much memory you should actually get, it comes down to a question of purpose. How are you going to use your iMac? Most people will be fine upgrading to 16GB of RAM. While you can get away with 8GB if your computer use is relatively light, if your iMac will do any amount of work, either professionally or for school, you'll want to upgrade to at least 16GB of RAM.
Why? Because your work is going to be more intensive than you think it is. More RAM makes it easier to have more applications open at once, have more browser tabs open, can lead to faster waking from sleep, and can just help your computer run faster. Plus, if you do have that one intensive application for work or school that needs a lot of RAM (and that could be Chrome), the more you have, the less your system chugs to a halt when you're using it.
I'd say that if you can swing it, get 32GB. For nearly every student out there and most professionals, it's all you'll need. If you spend a lot of time on your computer, 32GB should give you the headroom to handle anything that's thrown at you, even video and audio editing, without having to worry. If you're working professionally in video or high-end development, consider 64GB or 128GB.
Best memory for 2020 iMac (27-inch): Our recommendation
For most people, 16GB will be enough, and because of that, we'd recommend the OWC 16GB DDR4 RAM kit. It's only one stick, but it leaves your other RAM slots open if you want to expand up to 64GB by just buying this kit three more times.
If you want more headroom for things like more intensive applications or more browser tabs, most consumers, and indeed, most professionals, will be okay with the OWC 32GB DDR4 RAM kit. We'd select the OWC kit because it's a reliable product with a long-standing presence in the Mac community. While much of that is valid for Crucial, some of us have had some issues with Crucial memory in the past that I haven't encountered with OWC.
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