2017 27" iMac SSD Speeds

just!ns

macrumors newbie
Original poster
Dec 27, 2016
9
5
Has anyone had a chance to run write/read tests on their new 2017 iMac's 512MB or 1TB SSD? If so, please post your results!
 
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just!ns

macrumors newbie
Original poster
Dec 27, 2016
9
5
Nice! Thanks for testing. Looking forward to picking up the base 27" with the 512 SSD. I'm impressed with my 2016 13" MBP's 1350 write and 2160 read (using AJA) ... 2080 write will be even better!
 

keysofanxiety

macrumors G3
Nov 23, 2011
9,537
25,262
I thought the 15" MacBook Pro had 3GB speeds, disappointed this doesn't.
Up to; it's difficult to fully saturate it so it's unlikely you'll get the full banana at any given point. However Flash chips on the Macs work in parallel so the larger the storage, the quicker the speeds.

Generally if you're looking for something close to the quoted speeds you'll need the 1TB.
 

Ylan

macrumors member
Oct 27, 2016
45
7
Stockholm
Up to; it's difficult to fully saturate it so it's unlikely you'll get the full banana at any given point. However Flash chips on the Macs work in parallel so the larger the storage, the quicker the speeds.

Generally if you're looking for something close to the quoted speeds you'll need the 1TB.
Would there be a significant difference between 512 GB and 1 TB? I mean significant in the sense that the latter would postpone the need to upgrade down the line?

Humbly, Ylan
 

keysofanxiety

macrumors G3
Nov 23, 2011
9,537
25,262
Would there be a significant difference between 512 GB and 1 TB? I mean significant in the sense that the latter would postpone the need to upgrade down the line?

Humbly, Ylan
Ehh well 512GB is still a best of a performer. The only thing I can think of with regards to longevity would be the storage space; more storage means less need to use external storage.

Otherwise the 512GB is still an absolute beast, so feel free to get what you feel is best. :)
 

Coz007

macrumors newbie
Jun 19, 2017
9
2
Ehh well 512GB is still a best of a performer. The only thing I can think of with regards to longevity would be the storage space; more storage means less need to use external storage.

Otherwise the 512GB is still an absolute beast, so feel free to get what you feel is best. :)
I am conflicted between the 256 and 512. I am not concerned so much about storage space as I will be purchasing an external drive in the near future for my bigger files. I was more concerned with whether I would see a huge speed difference in everyday tasks. Opening apps, web browsing and stuff like that. Thank guys!!

Also if anyone has any benchmarks on the 256 that would be great!!
 

Ylan

macrumors member
Oct 27, 2016
45
7
Stockholm
Ehh well 512GB is still a best of a performer. The only thing I can think of with regards to longevity would be the storage space; more storage means less need to use external storage.

Otherwise the 512GB is still an absolute beast, so feel free to get what you feel is best. :)
If money was not an issue, 2 TB would be best. It is however, regrettably an issue. :(

Humbly, Ylan
 

MJForever23

macrumors newbie
Nov 16, 2016
7
3
I have new 27 inch iMac (basic model) 3.4G 8GB RAM 256G SSD with Radeon 570.

My 256G SSD only got 1400 MB/s write and 2100 MB/s read

Is it normal ?
 

EugW

macrumors G3
Jun 18, 2017
8,143
5,496
I have new 27 inch iMac (basic model) 3.4G 8GB RAM 256G SSD with Radeon 570.

My 256G SSD only got 1400 MB/s write and 2100 MB/s read

Is it normal ?
Smaller capacities often have slower speeds so that's not surprising.
 

geoelectric

macrumors 6502
May 19, 2008
325
14
Y'all are absolutely terrible for my pocketbook. I just cancelled the order with the 3TB Fusion for a 1TB SSD. I'd have gone 512GB and saved a few hundred, but the wait time was nearly a month longer.

But once I realized the fastest external SSD I was going to be able to put on it was a fraction of the speed for more money, more hassle, and more risk and heat from the Fusion Drive...getting a maxed i7 with the Fusion just seemed too much like putting Prius tires on a Corvette. Luckily my wife understood that argument too!
 

cynics

macrumors G4
Jan 8, 2012
11,554
1,871
Really? plan to order 512G SSD instead of 256G SSD just for $250 more. Looks worth it.
Yes but its not so much a problem anymore. The issue was NAND was accessed in parallel and to increase capacity more NAND chips were added so larger capacity SSDs tended to be faster.

Now with various chip capacities, layers, types, etc etc most name brand name manufactures have fairly close performance regardless of capacity. Samsung 850 EVO (SATA SSD) varies by around 5mbps between 120gb, 250gb, 500gb, 1tb and 2tb. There 960 PRO (PCIe SSD) are similar as well.

There was a time moving from 128gb to 256gb could literally double performance. And you can still see that in some SSDs now. The new problem is since the tech has developed and everyone has them the cheapest wins, so now you can find speeds all over the place and larger SSDs (same brand and model) being slower than their smaller counterparts. Just for example the Adata SX8000 512gb SSD has a read speed of around 1200mbs, the 256gb version is over 1400mbs.
 
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cityboy-100

macrumors member
Jun 5, 2016
68
52
I didn't realize the 512gb disks were on back-order, I think I would rather pay more to get the machine sooner in that case :/
 

EugW

macrumors G3
Jun 18, 2017
8,143
5,496
Join us. The 2017 iMac is calling your name. One of us... one of us...;)
You get the same killer SSD speeds in the MacBook Pro now too. Even my 256 GB MacBook 2017 has write speeds well over 1000 MB/s.
 

Glideslope

macrumors 603
Dec 7, 2007
6,342
3,415
A quiet place in NY.
Y'all are absolutely terrible for my pocketbook. I just cancelled the order with the 3TB Fusion for a 1TB SSD. I'd have gone 512GB and saved a few hundred, but the wait time was nearly a month longer.

But once I realized the fastest external SSD I was going to be able to put on it was a fraction of the speed for more money, more hassle, and more risk and heat from the Fusion Drive...getting a maxed i7 with the Fusion just seemed too much like putting Prius tires on a Corvette. Luckily my wife understood that argument too!
LOL. Yes, my wife was very flexible in the negotiations as well. :rolleyes:
 
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Chancha

macrumors 6502a
Mar 19, 2014
939
816
i7, 1TB, 40GB RAM
2016MB/s write, 2352MB/s read

Originally was going to get only the 512, then looked at the Time Machine drive that was going to be migrated and it was 300+GBs, worrying about not enough headroom for foreseeable future and pulled the trigger. 1TB option is pricy, but well worth it if you need it.
 
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