How to know the memory ram brand name in my iMac

You don't need to know the brand name for the memory. Apple has memory made to meet its specifications. If you need more memory and are trying to ensure it matches the existing memory, go to

In North America, OWC … (OWC) - Performance Upgrades For Your Mac

In Europe contact Crucial.com … RAM Memory Upgrade

Both companies have facilities to guide you and will recommend the correct memory package to meet the needs you describe to them. There may be benefits buying from whichever company has a branch in your own geographical location insofar as Shipping charges, Local sales taxes and Exchange rates. Check out the basic memory costs and do your sums.

If your late 2013 iMac is a 21 inch screen model, then the RAM is not upgradeable.

You still haven't told us what size screen your iMac has. As MichelPM says, the memory on a 21.5 " can not be upgraded, at least officially. Amongst other things you will void your guarantee.

You do not want to put Corsair ram in that imac. As difficult as it is to get open you're not going to want to do it againg when bargain basement ram like Corsair starts causing kernel panics. Save youself the trouble and use the correct spec Crucial ram. http://www.crucial.com

First Apple does not certify third party ram. Corsair is one of the worst, they work great in PC but not so well in Macs that require EXACT spec ram instead of the fast and loose close enough that the bargain basement brands like Corsair use. If you have the opportunity to get Crucial I'd strongly recommend that you do.

seventy one is trying to impress upon you that once you open that iMac Apple will never again support you with repairs. You'll be on your own.

Thank you, Mike. 😀

Yes, I tend to think that everyone buys Applecare ... which they don't. 😀 Though it isn't applicable to this matter, do buy it next time you buy a new computer.