If I have two 2 GB memory slots used currently, can I either just add these two 4GB to my existing iMac or I could order two of these an upgrade to 16
1942867
Depends how old your Mac is. If it only supports 1067MHz I believe the maximum you can put on it is 2x 4GB modules, so a total of 8GB max.
1307737
No. You can replace the two 2G RAM chips in your Mac with two 4G RAM chips (if the model of Mac you have will accept and read a total of 8G of RAM) and you should notice improved speed and absence of hesitation and "spinning beachball." If you replace only one 2G RAM chip with a 4G RAM chip, you won't see a lot of difference from the original(I was told by a Mac technician).
1513733
Yes, I put one in my Macbook 3,1 and went from 2 to 6 GB with no problem. The Mac recognized the 6 GB even though it says it only will do 4 GB.
286630
Check he details of your currently installed ram from the apple "about this Mac" menu. You should look at the 'memory' section and the new ram should match (all but the GB). I'd also check a few forums to see if they were able to upgrade the ram for your specific model. I would have thought it would be fine, however, I had to play about with mine a bit for it to accept the upgrade and actually show the ram installed. Hope this helps.
430675
Chack if your imac currently uses 1333Mhz memory (look for that in System info) if it does (which i think is very likely) you should have no problem with this memory
1176924
No this Imac is not able to upgrade to 10.6 I believe 10.5 is the latest OS you can upgrade to. This iMac has a maximum RAM capacity of 1G. However, only one RAM slot is easily accessible. Hopefully the "user-accessible" slot is open, meaning you don't have to pull a module to upgrade.You can install a 512MB module in the open slot to give you a total of 768MB for this system. I believe this is the correct ram needed PC-133 144 Pin SO-DIMM. This should help you just click on the drop down arrows to choose your system http://www.crucial.com/?gclid=CPOCs9CRlrgCFYuf4Aod3g0Avg&cpe;=pd_google_us&ef;_id=UdWSdwAABCqV0i1A:20130704151919:s No this Imac is not able to upgrade to 10.6 I believe 10.5 is the latest OS you can upgrade to. This iMac has a maximum RAM capacity of 1G. However, only one RAM slot is easily accessible. Hopefully the "user-accessible" slot is open, meaning you don't have to pull a module to upgrade.You can install a 512MB module in the open slot to give you a total of 768MB for this system. I believe this is the correct ram needed PC-133 144 Pin SO-DIMM. This should help you just click on the drop down arrows to choose your system... » Read More No this Imac is not able to upgrade to 10.6 I believe 10.5 is the latest OS you can upgrade to. This iMac has a maximum RAM capacity of 1G. However, only one RAM slot is easily accessible. Hopefully the "user-accessible" slot is open, meaning you don't have to pull a module to upgrade.You can install a 512MB module in the open slot to give you a total of 768MB for this system. I believe this is the correct ram needed PC-133 144 Pin SO-DIMM. This should help you just click on the drop down arrows to choose your system http://www.crucial.com/?gclid=CPOCs9CRlrgCFYuf4Aod3g0Avg&cpe;=pd_google_us&ef;_id=UdWSdwAABCqV0i1A:20130704151919:s « Show Less
768284
If it is the same pair that I bought, then no. You have to be really careful finding the right ram for the older imacs. Try looking on ifixit.com to figure out exactly which ram will work with your year of imac.
40585
It is my understanding that the GBs can be doubled. Meaning if your current factory installed memory is 2.0 GB you can add additional memory in increments of 2GBs.
964952
Yes, i had the same situation and upgraded my 2011 imac to 16gb. It is totally worth it.
1857817
There is a page on Apple's website that may answer you question (http://support.apple.com/kb/HT1270?viewlocale=en_US#link1). Your Mac does not support 16GB of RAM, though 8GB are enough to run both these programs smoothly. This memory is not the right choice for your Mac, as it is (PC3 - 12800), and your Mac requires (PC3 - 8500).I've already searched the one that is just right, which is in this link: Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1066 MT/s (PC3-8500) SODIMM 204-Pin Mac Memory CT2K4G3S1067M / CT2C4G3S1067M
1493949
Your iMac will tell you the exact memory upgrade you need for your pc. Click on the Apple symbol at the top left corner. From the drop down menu, select the "About This Mac". This will bring up the information about your system memory needs. You must make sure to purchase exactly as described. If you are uncertain, take your iMac to your local Apple or Best Buy store. The representatives will be glad to assist you in determining your exact needs. At Best Buy, they will match the price of Amazon and often install it for free or a small fee. I do not recommend "Genuine Apple" since it is way over priced. I use memory from Komputerbay which works perfectly. It has increased my speed and it makes my pc work like when it was new!
1738016
Not that I am saying that the other people who answered are wrong, but I have the mid 2011 model iMac, which came with 4gb of RAM, and it says on the box and on the Apple website that it is not upgradeable. On mine, I was able to take off the back cover and there were two empty RAM slots. So I replaced the two 2gb RAM sticks with 4gb, and added 2 more 4gb of RAM. I now have 16gb of RAM in my computer and it works like a champ...performance and speed wise.
1738017
According to what I found out The 21.5 inch iMac does not have the ability to change out the RAM if you want to upgrade. But do not take my word for it. Do some research as things change so rapidly with computers, as you know new os'es are coming out faster each year. New intel chips too with imacs etc. It wont be a bad idea to talk to apple about this question as well. You can log on to their apple store website and launch a chat with a rep and ask this same question they might guide you to the best imac for you that may be able to upgrade or you never know this imac now may be able to upgrade as I said changes happen quickly to many of these devices that its hard to keep up. Speaking to a representative at apple will help you as well. I hope this has been at least some guidance for you. Good Luck with your search and your purchase.
2117586
No. The 2007 iMacs use DDR2 memory. You can usually use faster speed ram in a older system but it still has to be the same type. DDR2 and DDR3 are not inter-changeable.
1246688
I upgraded my ram to 2GB right after I got this MacBook, it is cheaper to upgrade by yourself, mine only cost $60 for 2GB ram. If you bought from mac, would be $150 more..It is also super EASY to install the ram anyway...I'm a girl, I did it very easily. I have been using the new ran for couple months and does not have any problems.
138028
Answer edited thanks to Alvin's comment... Looks like this is exactly what you want according to what the following site says.http://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/Macbook_selectorhttp://eshop.macsales.com/shop/memory/MacBook/DDR2/http://eshop.macsales.com/item/Other%20World%20Computing/5300DDR2S2GB/
770257
They only have 2 slots for memory, I know you can get 8 gb sticks, I don't know if there are 16 gb stick of memory available