Timetec 16GB Kit (2x8GB) DDR4 2400MHz PC4-19200 SODIMM RAM Upgrade for 2017 iMac 27/21.5-inch Retina & Non-Retina 4K Models (iMac 18,1 / 18,2 / 18,3)

Update - 07/22/2020Timetec did respond via email to my email request for support. They offered to replace the RAM memory free of charge. It was 9 months old. They provided a free shipping label, and I shipped the product back. They shipped back replacement memory free of charge timely. They sent tracking information. I installed the new Timetec 2 - 16GB cards memory easily and did not need to switch slots as with the prior RAM memory shipped. My iMac recognized the new RAM memory with no problems. I now have 40 GB RAM memory installed, and system is working without crashes so far after 24 hours. I still think it is important for people to know that if your computer system crashes frequently after an upgrade to the RAM, check the RAM. I will update again if I notice my system crashing again in days to months.I am impressed with Timetec customer service. They emailed me that they are a small business, and do not list a phone number or answer a phone. They did everything correct to make this purchase right. I will purchase from them again without hesitation. I am posting to let people know my experience. I upgraded my overall rating to 5 star. I am not going to fault them for the initial bad memory since I realize this can happen with any product. Thank you Timetec :)======================Initial Review - 7/2020I received 2 sticks of 16GB RAM Timetec memory last year and was able to get 27 inch IMAC 2017 5 K display 3.8 Hz working after adjusting which slots to insert memory. I had to move the memory sticks along with the Apple installed memory and it seemed to work when placed in slots 2 and 3. My system had 40 GB of memory. But then my IMAC started crashing. I can't remember how long it took before the system started crashing. It may have been days to weeks. Black screens and reboots. Very irritating. I blamed the Apple product IMAC. I did not associate this with the Timetec RAM memory. We just used our windows computers and other laptops for important stuff in case the IMAC crashed. We have been dealing with the IMAC crashes daily for months. I bought cleanmymac program and this software program also crashed every time it tried to run the RAM check. I contacted cleanmymac and they could not figure it out. We had no viruses or malware. Finally, after additional months of having the IMAC crash, I was ready to junk my IMAC. I had contacted Apple suppliers regarding replacing boards and doing hardware servicing and they all recommended that it would be too expensive. As a last resort, I decided to finally remove the Timetec RAM and guess what?! The IMAC system works without crashing. I tried calling Timetec to discuss, but they don't have a phone number. I am awaiting their response via tech support and support email. I agree with the others here who have had problems with the 2017 IMAC system and can't believe how much time I wasted trying to fix my IMAC issue. I wish I had thought of removing this RAM many months ago. I decided to post this to help others just in case your Apple IMAC starts crashing or giving you problems. Think about removing the Timetec RAM and see what happens. It may save you from junking your IMAC computer. It did for me.

works great now 64GB total

The installation was easy. The YouTube video (for the iMac) will tell you the step-by-step. The hard part was when the the Mac would not boot-up. I soon learn a RAM upgrade can be problematic with the iMac. And there are several suggested solutions/fixes in the technical forums. In summary, I reseated the new RAM firmly into the slots. I then powered it up and waited for at least 30 seconds before it started up. However, I encountered performance issues but those were finally resolved as well. So at the end the iMac recognized the new RAM and after 1 month of use, so far, I'm very satisfied with the performance of this product.

I was worried about a problem installing 2 16GB on my trusty iMac. Existing 4GB boards were on slots 1 & 3. I added the two 16GB boards on slots 2 & 4 as Apple recommended. The computer booted up w/o any problems. I love it that these boards are made in the USA and if any problems arise I'll get help.

item comes as described, well packed, works flawlessly in my late 2017 21.5 iMac.

This was the cheapest 16GB DDR4 RAM I could find for a new Intel NUC desktop mini computer. I generally buy RAM first by spec, then by cost. Even if cheap RAM doesn't work, it won't ruin anything. The description of this Hynix RAM says it's for Apple, but it will work in any PC requiring DDR4 laptop memory. I used it in a new Intel NUC with an i7 processor.This is perfectly good RAM. Don't be deterred by description saying it's for Apple. I encountered memoryerrors with the first set of Hynix modules I received, but they were easily returned and replaced. The replacement set works perfectly--and I have the guilty suspicion that the issue with the original set was due to my not seating one of the modules correctly. The second time around the top RAM module went in the slot more cleanly, a difference I only noticed when I was replacing the first set with the second. Sorry, Hynix, it may have been the fault of a balky clip rather than your RAM. I really don't know.This is good RAM at a good price.

I have just upgraded my iMac 18.2 (2017 4K retina, 21.5") from 8gb to 16 gb. I also upgraded my HDD (original fusion 32gb - 1 TB) to SSD (also Timetec, 1TB). It wasn't easy install by straightforward and without issues or problems. My iMac is now on steroids 😁blasting fast (Core i5 3.4GHz). It's a worthy upgrade but I am not recommending DIY if you are not comfortable with process and not familiar with electronics (21.5" iMac must be opened and stripped to the core), 27" iMac no problem (memory user accessible).

My new iMac went from 8GB up to 40GB by adding these two 16GB Timetec Hynix memory cards! (For reference, the iMac it replaced maxed out at just 6GB!)I chose the Hynix memory because earlier Apple Macs used this brand. They've been around for a while, which is reassuring. Even so, before buying I emailed TimeTec's support to make sure about their lifetime warranty - and they replied the same day!Their reply: "Please don't worry about it. We provide lifetime warranty for our memory products for US customers. So we can offer you free exchange for replacement anytime you have problems with our memory, no matter how many years you have used it."That level of service and reassurance sold me - as did the competitive price.The installation was easy and took about 5 minutes from shut down to start-up (with everything unplugged in between). The iMac booted just fine on the first try and, as noted in this pic with this review, the 40GB shows up, ready to go! In time, I'll pull the two original 4GB sticks and replace those with another set of TimeTec 2x16GB cards.

Funciona bien para la imac 2017 4k retina. Requerí ayuda de especialistas porque hay que desarmar toda la mac para alcanzar las ranuras de memoria y hay mucho riesgo de dañar algún componente interno (problema de la mac, no de los módulos de memoria) . Sin embargo, si hay una mejor notable en el desempeño de la mac. Los módulos permiten correr varias apps al mismo tiempo. En mi caso utilizo apps de edición muy pesadas y ya casi ninguna se congela. Fue muy buena compra.

you put them in carefully. And ready. You will make your iMac fly like never before. They work wonderfully and their price-quality ratio is good. I bought 4 of them in total and I am happy.las metes con cuidado. Y listo. Harás que tú iMac vuele como nunca. Funcionan de maravilla y su relación precio calidad es buena. Compre 4 de ellas en total y estoy feliz.

Works great and way cheaper than buying from Apple. Note that when I booted up after installing, my iMac restarted and looked like it might have crashed, but after the restart everything was working fine. I found out later that it was just recognizing the new memory configuration. The new memory is playing nice with the original Apple memory with no issues, all in all a great value.

Funciona sin problemas. Si acaso al leer la documentacion (del equipo y como instalarla se menciona que toma un tiempo en configurarse la memoria) asi que puede pensarse que ya no encenderá el equipo (ufff) pero luego ya prende y se ve la diferencia en desempeño, se reconoce bien en el autodiagnostico de memoria del SO.

Como siempre, muy, muy fácil de instalar en cualquier iMac de 27 pulgadas. Muy recomendable vaciar la NVRAM —o PRAM— inmediatamente después de instalar la memoria (buscar las instrucciones exactas en el sitio de soporte de Apple, es muy fácil). La recomiendo ampliamente para cualquier propietario de un iMac.