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Old Oct 29th, 2014, 12:51 PM   #1
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Upgrading RAM in my 27" iMac, Late 2009

Hey All,

Quick question about RAM.

My 27" iMac is crawling since upgrading last year to Maverick.

I only have 4 gb of RAM and am thinking I need to upgrade.

Right now my iMac came with 4GB of RAM which is taking up 2 slots leaving me 2 slots free.

According to apple I can only handle 16 gb of RAM.

If I buy two 4gb "sticks" of RAM that will only add up to 12GB

Can I buy two 8gb "sticks which will total 20gb? just so I can max out the 16gb or will that destroy my computer!?

Am I able to remove the 2 ram's that currently came with my iMac or should I leave those in?

Also, I was looking at crucial.com as I heard good thing about them, but open to alternatives.

Thanks for your help in advance!
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Old Oct 29th, 2014, 12:59 PM   #2
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You can definitely remove the RAM that is there. I had 12 gigs in my old 17" iMac, think it was the last one with a super drive. You could buy the 2 8 gig sticks and just pull the original ones out from apple giving you the 16 gig limit. I do not think it would hurt anything to leave the other RAM in there, but I do not see the point if it cannot use it. What are you using the computer for?
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Old Oct 29th, 2014, 01:02 PM   #3
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Thanks for the advice "wonderings"

The computer is my home iMac that I used to use 24/7 when I worked from home, but now that I work in an office I use a macbook air connected to a external monitor. That said, I occasionally do a bit of work at home on my iMac still and it is painfully slow!
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Old Oct 29th, 2014, 01:40 PM   #4
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Don't forget to checkout a highly recommended Canadian site for your iMac's memory:
Canada RAM sells memory in Canada - Apple Macintosh iMac intel Core2Duo, CoreDuo 17", 20" and 24"

Also a highly respected ehmac.ca member!!
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Old Oct 29th, 2014, 01:55 PM   #5
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Thanks for the heads up. I will most certainly look into supporting a Canadian company!
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Old Oct 29th, 2014, 02:12 PM   #6
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You might want to keep Activity Monitor in your Dock to keep it handy to keep an eye on what your iMac is doing with it's memory.

Adding RAM won't necessarily fix the speed problem if your drive's data is a mess, and there's an easy fix for that that's worked for me and other members.

Basically, use CCC to clone your boot drive, boot from it and make sure everything works.
Then if everything's OK, erase the boot volume but also use the erase option to zero out that volume or one pass secure erase which is the same thing. Do NOT bypass this step!!!
Then when it's all done, use CCC to clone back your backup and boot from it as your Startup Drive..

And also, make sure that your boot drive is the topmost if you have various partitions. Disk Utility will show the order of any partition volumes.

It's worked wonders for me and others.
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Old Oct 29th, 2014, 02:27 PM   #7
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Quote:
Originally Posted by emalen View Post
Thanks for the advice "wonderings"

The computer is my home iMac that I used to use 24/7 when I worked from home, but now that I work in an office I use a macbook air connected to a external monitor. That said, I occasionally do a bit of work at home on my iMac still and it is painfully slow!
What is the type of work? If your doing design working with Adobe CC then as much ram as possible.
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Old Oct 30th, 2014, 08:45 PM   #8
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Yep...you can run up to 32GB, in 64bit mode.

I have two 4GIG modules and two 8 GIG modules in my late 2009 iMac. Runs flawlessly.
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Old Oct 30th, 2014, 09:33 PM   #9
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Quote:
Originally Posted by emalen View Post
Hey All,

Quick question about RAM.

My 27" iMac is crawling since upgrading last year to Maverick.

I only have 4 gb of RAM and am thinking I need to upgrade.

Right now my iMac came with 4GB of RAM which is taking up 2 slots leaving me 2 slots free.

According to apple I can only handle 16 gb of RAM.

If I buy two 4gb "sticks" of RAM that will only add up to 12GB

Can I buy two 8gb "sticks which will total 20gb? just so I can max out the 16gb or will that destroy my computer!?

Am I able to remove the 2 ram's that currently came with my iMac or should I leave those in?

Also, I was looking at crucial.com as I heard good thing about them, but open to alternatives.

Thanks for your help in advance!

Wait for ram prices to come down, they're at an all-time high.

But after that, find out what your model is capable of and max out the ram!
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Old Oct 30th, 2014, 11:11 PM   #10
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Quote:
Originally Posted by Macster Blaster View Post
Wait for ram prices to come down, they're at an all-time high.

But after that, find out what your model is capable of and max out the ram!

I don't think one is going to see the good old RAM prices for a loooong time, if ever again, and as as for the broken "max out the RAM" phrase, I dare say that 32GB RAM that the OP's iMac can use, is overkill for most users.

I'd say that anything over 16GB with even a recent iMac is getting excessive - for the average user!!

And I've got 20GB in my mid-late 2011 27" iMac and have never even come close to using all of it. But then again, I don't do games or any high end video or graphics stuff, those users will appreciate having lots of memory available, and OS X 10.9.x and 10.10.x use it even more efficiently.

Activity Monitor is the place to keep watch on memory usage and if more is needed. And it come included at no additional cost.
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