riMac late 2015 and NVMe

Andrescarpa

macrumors newbie
Original poster
Oct 23, 2015
10
1
I've just received the new iMac (27", i7, M395x). Updated to 10.11.1 and I've noticed that the GPU is described as "kHW_AMDRadeonR9M395XItem 4096 MB" and in System Informations there is no NVMe device detected... Is this normal? My 500Gb SSD is listed under SATA/Sata Express. BlackMagic says it runs at 1800MB/s like the others. Thank you all!
 

Topazali

macrumors newbie
Apr 30, 2012
3
0
Scotland
I called Apple and they said that the SSD is ok but they didn't answer me about the GPU...
I've just received my new iMac 5k too. My 512GB SSD is showing up under the SATA section as well. No NVME devices detected. My GPU is reported correctly (without the the extra text).
I was under the impression that the new SSDs were all NVMe as well?
 

Andrescarpa

macrumors newbie
Original poster
Oct 23, 2015
10
1
Ok, that's great:)
I Think every ssd is on NVMe anyway...
 
Last edited:

Chytin

macrumors member
Oct 24, 2013
79
120
You would never get 1800 MB/s with SATA. It is definetly NVMe, only thing is whether it uses 2 or 4 lanes PCIe. The new iMac has 4 lanes, before it was 2 lanes which maxes out at 700-800 MB/sec if I am correct.
 

Andrescarpa

macrumors newbie
Original poster
Oct 23, 2015
10
1
I messed up a bit with The iPhone keyboard... I'm italian and the autocorrection failed XD
 

Andrescarpa

macrumors newbie
Original poster
Oct 23, 2015
10
1
GPUmeno.jpg
GPUgiusta.jpg
I've just realized that the strange text is only in Italian. Every other languages has the correct name for the GPU. ARGH. This thing drive me crazy. Does someone know if I can modify the localized files on my own?
 
Last edited:

Andrescarpa

macrumors newbie
Original poster
Oct 23, 2015
10
1
Apple said that The ssd is listed under NVMe only If you have fusion drive...
 

dyn

macrumors 68030
Aug 8, 2009
2,708
384
.nl
Some people need to update their SATA knowledge. There is something called SATA over PCI Express or in short "SATA Express". That's why the category is named "SATA/SATA Express" and that's why it is capable of doing 1800MB/s. Apparently this is in the SATA3.2 spec which is able to do up to 16Gbit/s. SATA Express inherits SATA and that is a problem for SSDs because SATA (and thus SATA Express) is aimed at HDDs that behave differently. NVMe is similar to SATA but it is aimed at SSDs instead of HDDs. It doesn't mean that an SSD now gets higher sequential speeds because that is still limited to PCIe (just like with SATA Express). What it means is that things now work more efficiently because everything is catered towards an SSD. It means lower latency and more IOPS.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.