Late 2015 27 iMac 5k RAM spec

The memory arrived today (5k iMac is still expected by Friday). I don't think thickness of the ballistix memory will be an issue. The 'cover' is just a sticker. There are stickers on both sides of the memory modules, but no metal case or heat sink over the chips.

Cool, keep us posted of the outcome. My iMac is due to arrive Thursday but the memory is on back order.

I also ordered the Ballistix modules I listed -- I figured most SODIMMs will be small enough for laptops. Glad to hear they aren't thick. My iMac arrives in about 10 days.

- Steve

Ok guys, received the iMac yesterday and set it all up. I received the new memory today - two 16GB modules and installed them. Did I install them correctly?

Did you install them in the two empty slots? That is the correct way. In the new iMacs with the vertical setup, slots 1 and 3 (from the top) should match, and slots 2 and 4 should match.

In the older Macs with side by side arrangement, it was recommended to match them horizontally.

Thanks babowa. I actually moved the 4gb modules into the empty slots and inserted the 16gbs into those two slots. I want the system to look for the 32Gb's first. I kept them staggered. 16 - 4 - 16 - 4

just wanted to be certain I did it correctly. it's been a while since I mixed ram sizes. At $600 a pair, it will be a while before I do another 32gBs.

Since they changed the configuration, I'm not sure that they are still being addressed in a certain order, but be that as it may, as long as you've got them matched, no problem. Still think what you got is an overkill, but... that is what you wanted and that is what you got.

Other World Computing guarantees the RAM they sell. Use their website to determine the RAM you need. If they sell it they will guaranteed that it will work in your system.

Anyone try the 1866mhz ram??? curious if it worked.

Could you let us know if the ram worked.. Thanks

For those of you who is curious about 1866Ghz ram, I can confirm you it works and it will show as 1867Ghz on the late iMac 2015. I bought this kit: http://uk.crucial.com/ProductDisplay?urlRequestType=Base&catalogId=10153&categor yId=&productId=11732&urlLangId=-1&langId…

My new 5K iMac arrived this afternoon and I installed 2 sets of Crucial Ballistix Sport 16GB Kit (8GBx2) DDR3 1866

I got them from Amazon at $88.99 per pair - http://www.amazon.com/gp/product/B00DSGLMSM

About Mac shows 32 GB 1867 MHz DDR3. Not only does the new memory work, according to Geekbench it is faster than RAM that came with the iMac

BEFORE AFTER

Single-Core Score 4486 4569

Multi-Core Score 17424 17816

Memory Single-Core 3649 4141

Memory Multi-Core 3763 4349

The overall scores went up a little because they are mostly based on CPU performance. But the memory specific scores went up a lot.

I'm glad that RAM I posted works! I'm waiting for my iMac to arrive to install them as well -- good news about the speed (although the difference is probably not perceptible, the Ballistix RAM is advertised to be faster than standard RAM). At the price, it was definitely worth it!

Can you show us (eg a picture or text diagram) how you installed them? Did you install them so the faster larger sticks are the first block of memory the Mac sees?

the Ballistix RAM is advertised to be faster than standard RAM

Just as in FYI....

I am not familiar with the latest iMac; however, on previous models, it was recommended to get RAM with the exact specifications as recommended by Apple as Macs are extremely finicky about the RAM. As well, the Macs were not any faster as they could only address the speed as noted in the specs.

Hopefully these modules will be working correctly.

Its funny cause your asking for 3rd party ram when all apple sells is 3rd party ram. Don't act like apple is the underdog anymore and original. No no no. They use LG for the 4K screen and Samsung for all the chips in mobile. And if dell can produce the same 5K screen but better where does this leave them?? There all just getting their supplys from one big factory.