iMac 5K 27" Late 2015

[FabLn]

Hello 🙂

Im looking to upgrade the memory of my newly bought Imac 5K 27" Late 2015
It says that memory needs to be 1867MHZ

But looking on some website they sell only 1866MHZ selling its working great

Anyone using it ? Any feedback ?

Thanks a lot

 

[bogg]

Hello 🙂

Im looking to upgrade the memory of my newly bought Imac 5K 27" Late 2015
It says that memory needs to be 1867MHZ

But looking on some website they sell only 1866MHZ selling its working great

Anyone using it ? Any feedback ?

Thanks a lot

It's just 1866,666 rounded differently, Apple rounds up, the rest of the industry rounds down. As is usually the case when it is Apple and components needing to sound just a little bit better than they really are 🙂

2133 will work well as well

Go for 1866 or 2133 with CL11 Or lower
Apple ships with 1866 cl13 iirc

Either should work fine
[doublepost=1453202167][/doublepost]Thread about 2133MHz ram:

https://forums.macrumors.com/threads/2133mhz-ram-test-results.1929801/

 

[FabLn]

So will this ones be compatible ? http://www.manau.fr/?products/listing&search&searchAfter=true&process=boxSearch&keywords=DDR3L-1866

 

[bogg]

They should be

 

[Erdbeertorte]

I have the Kingston HyperX Impact 2133 MHz DDR3L with CL11. Might be a little faster if you don't mix them with the stock RAM, then they'll slow down to 1866 MHz and may cause other problems.

http://www.amazon.com/dp/B00NTQ0GOM/

CL9 might be a little better but I have no experience with any. There is a long thread of what RAM is suitable for that iMac.





Edit:

https://forums.macrumors.com/threads/2133mhz-ram-test-results.1929801/

https://forums.macrumors.com/threads/ram-question.1928280/

 

[FabLn]

They should be

Thanks a lot for your feedback1

 

[FabLn]

I have the Kingston HyperX Impact 2133 MHz DDR3L with CL11. Might be a little faster if you don't mix them with the stock RAM, then they'll slow down to 1866 MHz and may cause other problems.

http://www.amazon.com/dp/B00NTQ0GOM/

CL9 might be a little better but I have no experience with any. There is a long thread of what RAM is suitable for that iMac.


View attachment 611418


Edit:

https://forums.macrumors.com/threads/2133mhz-ram-test-results.1929801/

https://forums.macrumors.com/threads/ram-question.1928280/

Thanks a lot I will check right away
[doublepost=1453283659][/doublepost]And so I understand to install an SSD in this case a 1To Samsung Evo, I need to get new adhesives to seal back the IMac but can't find the correct reference anywhere and a Drive adaptor 2.5" to 3.5"!

 

[Erdbeertorte]

And so I understand to install an SSD in this case a 1To Samsung Evo, I need to get new adhesives to seal back the IMac but can't find the correct reference anywhere and a Drive adaptor 2.5" to 3.5"!

If you really want to do that yourself instead of using an external drive for not losing your warranty and accidentally damaging something, I would look at first here to decide if it's worth it:

https://www.ifixit.com/Guide/iMac+Intel+27-Inch+Retina+5K+Display+Hard+Drive+Replacement/30522

 

[FabLn]

Won't I loose any speed having the SSD 1To Samsung Evo connected as external ?

 

[Erdbeertorte]

Won't I loose any speed having the SSD 1To Samsung Evo connected as external ?

Yes with USB it's a little slower and you can't use Trim. Maybe a good Thunderbolt 2 adapter/enclosure/dock can run it at full speed.
But they are expensive and I have no experience with that. I just have an old adapter with USB 3.0 and Thunderbolt 1 and there is not much difference in speed when I connect it to Thunderbolt instead of USB if I remember it correctly. But it's long ago that I tested that and it was an HDD.

I could make a speed test with a 500GB Samsung EVO 850 connected to Thunderbolt and post the result. USB 3.0 is not working on my iMac at the moment because Apple seems to be too stupid to fix that long known issue with the new iMacs in every Beta, also my adapter is from an HDD enclosure and has no UASP, what makes SSDs connected to USB faster.

 

[maflynn]

And so I understand to install an SSD in this case a 1To Samsung Evo, I need to get new adhesives to seal back the IMac but can't find the correct reference anywhere and a Drive adaptor 2.5" to 3.5"!

Checkout iFixit's tear down. Its not an easy process to open up an iMac and it being new, I highly recommend you avoid this. As mentioned use an SSD externally if you want more SSD speed and the best way to do that is to use a thunderbolt enclosure.

 

[FabLn]

Checkout iFixit's tear down. Its not an easy process to open up an iMac and it being new, I highly recommend you avoid this. As mentioned use an SSD externally if you want more SSD speed and the best way to do that is to use a thunderbolt enclosure.

Thanks a lot for your feedback !
[doublepost=1453292541][/doublepost]

Yes with USB it's a little slower and you can't use Trim. Maybe a good Thunderbolt 2 adapter/enclosure/dock can run it at full speed.
But they are expensive and I have no experience with that. I just have an old adapter with USB 3.0 and Thunderbolt 1 and there is not much difference in speed when I connect it to Thunderbolt instead of USB if I remember it correctly. But it's long ago that I tested that and it was an HDD.

I could make a speed test with a 500GB Samsung EVO 850 connected to Thunderbolt and post the result. USB 3.0 is not working on my iMac at the moment because Apple seems to be too stupid to fix that long known issue with the new iMacs in every Beta, also my adapter is from an HDD enclosure and has no UASP, what makes SSDs connected to USB faster.

Thanks a lot - will be nice to see the results !
[doublepost=1453294067][/doublepost]Can I boot the iMac 5K 27" Late 2015 from SSD connected as external drive ?

 

[Daisy81]

Can I boot the iMac 5K 27" Late 2015 from SSD connected as external drive ?

I am fairly sure you can. I had a room mate in college back in the days of OS X 10.2 that was using external drives as the boot drive. 😀

 

[Sirmausalot]

Thanks a lot for your feedback !
[doublepost=1453292541][/doublepost]
Thanks a lot - will be nice to see the results !
[doublepost=1453294067][/doublepost]Can I boot the iMac 5K 27" Late 2015 from SSD connected as external drive ?

Yes, from either Thunderbolt or USB. Even though the internal NVRAM drive on the iMac is rated as faster (2.5X at that) to a traditional SSD, you'd be hard pressed to tell the difference.

 

[FabLn]

How to proceed to boot from the SSD in external ?

 

[maflynn]

How to proceed to boot from the SSD in external ?

Hold the option key while its booting, you'll get a boot menu, or within the system preferences, click on the startup disk preference.

 

[FabLn]

Connected the 850 EVO 1Tb as external with an Inateck case - should be USB 3 but don't speed up over 37MB/S
How is that possible ?

 

[maflynn]

How is that possible ?

Maybe a poor or defective chipset, might not be usb3.

 

[FabLn]

Any recommendation for a Thunderbolt adapter box good value ?

 

[joogle]

Any recommendation for a Thunderbolt adapter box good value ?

I am going to add to your thread as I have the same type of question. I am looking for a small form factor external USB enclosure for a SSD, mSATA, or other device that I can use as a boot up device. I want it to be small so I can possibly stick it somewhere behind the monitor or hand so it is not visible from the front.

I read on another thread, I can't now find where it is but someone used this enclosure with a mSata and got like speeds of 480 Mbps

http://www.amazon.com/Sabrent-Enclosure-Adapter-Support-EC-UKMS/dp/B00LRZPNHM/ref=cm_cr_pr_product_top?ie=UTF8

 

[mtbdudex]

I'm getting speeds of 115 MB/s with my NAS and WD EX2100, bare 2 bay case is $215....

Also - I spent $85 and got 16GB here, so added that to my existing 8GB gave 24GB
http://www.amazon.com/gp/product/B00DSGLMSM
Crucial Ballistix Sport 16GB Kit (8GBx2) DDR3 1866 (PC3-14900) 204-Pin SODIMM Memory BLS2K8G3N18AES4 / BLS2C8G3N18AES4