Following the advice in this thread I bought four sticks of the Kingston RAM recommended and tested by davidnui: KVR1333D3S9/8G
Coming from 8GB, the new RAM has made Lightroom's develop module much more responsive, and now I can easily have a few Adobe apps open with large files at the same time as I'm developing a website on a remote server.
However, whilst I haven't had any stability issues when I'm using the computer, I am finding that the computer frequently refuses to awake from sleep.
Please note that I'm not necessarily claiming that the frequent failures to wake from sleep are caused by the new RAM, but there certainly appears to be a correlation which I think it's worth telling other potential upgraders about, and which I'm keen to get to the bottom of.
Is this something that could likely be traced back to the new RAM? If so is it worth trying to run just two 8GB sticks (thus sticking to Apple's published maximum)?
Any other suggestions on trying to determine what might be the cause?
Have you tried running a memory test to verify that the new memory is good?
Hello everyone! My first post here, im getting nervous here!
I have a Late 2009 iMac myself and I have been wondering the same thing for the longest time, saved up some cash, and splurged for two 8GB memory sticks. Originally I had 2GB sticks in all four memory slots (8GB total). I took two of the 2GB sticks out and replaced them with the two 8GB sticks and... CHANGEO PRESTO!! 8+8+2+2= 20GB!!! It worked! Computer started up in under 18 seconds as usual and no errors have taken place! No reason I could replace the other two slots with 8GB if I already broke the 16GB barrier that everyone is skeptical of, 20GB is plenty for now, but only thing is my *GB sticks are 1333Mhz and my other two 2GB sticks are 1066mhz. With that being said the computer runs at 1066mhz not 1333mhz, selecting the lower of the two. But I believe if all four slots are replaced with 1333mhz it will run at 1333mhz. Alas, 20Gb of Ram will do me just fine for now! Hope this helps!
I bought it on ebay right here, SUPER CHEAP! Only $89.99 for two 8GB's!!!
http://www.ebay.com/itm/250961364716?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
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I'm pretty sure you shouldn't mix different ram. Your stock Apple ram is a different speed, so pairing it with 1333 is causing the issues. I would stick with the 16gb, and order the same ram as you did previously.
I have a Nov. 2009 27" i7 iMac. After reading all three pages of this thread, it would appear that 1333MHz 8GB RAM sticks will function properly and reliably in the long term on my machine. But to be sure of this, I would like to know if the specs of this OWC RAM (currently $150 for 2 sticks of 8GB) are truly compatible with my 2009 iMac?
http://eshop.macsales.com/item/Other World Computing/1333DDR3S16P/
Thank you!
Anyone know of a cheaper place to get 1333 8GB sticks? OWC ends up being $75 a stick, I found a few on eBay a lot cheaper that are Crucial/Patriot but not sure I trust the eBay route.
I bought these. They are $59 each stick. http://www.newegg.com/Product/Product.aspx?Item=N82E16820148468
It looks like it will work perfectly. Also they sell quality ram, and have a good return policy. Let us know how it works out.
Despite the great OWC return policy, the fact is I must pay international shipping (to Japan) both ways.
So if there's anyone with experience using those RAM SIMMs in a late 2009 iMac, I would love to hear from you.
Thanks.
See my post above (#52), this CFD Elixir RAM works perfectly.
Hi, I know this is an older post but could someone help me answer this question? From what I've learned from this thread - the following RAM should work (late 2009 iMac). Can anyone confirm or deny? http://www.ebay.com/itm/16GB-DDR3-P...hash=item56478216ab:m:mnf3C3_ldVAnK8cITlxQBag
All I can say is that the 1333MHz RAM I put in my Nov. 2009 QuadCore 2.8MHz iMac has been running fine from June 2013 until now. Makes no sense to use slower RAM when the 1333MHz stuff works and gives a tiny boost too, without any overheating problems at all.From what I've learned from this thread - the following RAM should work (late 2009 iMac). Can anyone confirm or deny?
Hello. I'd like to max out the RAM on my late 2009 iMac 27" 2,8 GHz Intel Core i7. Currently have 12 Go 1067 MHz DDR3 from when I bought it. I've read that @ECJ used Crucial memory that has no shipping cost from France. Could you kindly check that those would work http://www.crucial.fr/fra/fr/ct8g3s1339mceu ? Should I buy 1 first and test it before buying the other 3? Thanks
Will do, thanks a lot for your answer!That model you have listed will work. I would test 1 then purchase the other three. That model is the updated version of model I bought a few years ago.
Just to make sure, how did you arrange the chips in your iMac? When laying my iMac down (screen facing down), I have a total of 4 slots (2 on each side).