Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Upgrade the memory of your 2018 Mac mini up to 64GB
Handpicked deals...
$1299 $1299
SAVE $0

$390 $270
SAVE $120

$1798 $1598
SAVE $200

$3297 $2797
SAVE $500

$3397 $2797
SAVE $600

$150 $90
SAVE $60

$1398 $898
SAVE $500

$3698 $2998
SAVE $700

$2998 $2498
SAVE $500

$1999 $1999
SAVE $0

$1799 $1299
SAVE $500

$1999 $1199
SAVE $800

$2299 $1599
SAVE $700

$2399 $2049
SAVE $350

$2799 $2399
SAVE $400

$2799 $1899
SAVE $900

$1199 $920
SAVE $279

$1349 $1049
SAVE $300

$997 $897
SAVE $100

$2099 $1699
SAVE $400

$1999 $1349
SAVE $650

$1999 $1599
SAVE $400

$1999 $1999
SAVE $0

$1329 $929
SAVE $400

$4499 $3999
SAVE $500

$329 $329
SAVE $0

$1499 $999
SAVE $500

$1499 $1289
SAVE $210

$2199 $1999
SAVE $200

$3399 $2199
SAVE $1200

$2468 $1768
SAVE $700

$1279 $1279
SAVE $0

OWC 128GB Memory Kit: Bandwidth

OWC 128GB memory for 2013 Mac Pro

Get Mac Pro at B&H Photo. See also MPG’s computer gear wishlist as well as diglloyd-recommended performance packages for Mac Pro.

The OWC 128GB memory kit for the 2013 Mac Pro is manufactured with 1333 MHz parts, but runs at 1066 MHz when installed (this is a technical limitation). By comparison, the 64GB runs at full speed—1866 MHz—a substantial theoretical difference.

On the server-class CPUs (12-core sold by Apple, 8-core 3.3 GHz, 10-core 3.0 GHz), the modules unfortunately run at 800 MHz. But on the stock 4-core, 6-core, 8-core models as shipped by Apple, they run at 1066 MHz.

The difference in memory bandwidth as tested via the system call memcpy()* is substantial, as seen in the graph below, but in real-world applications the CPU on-chip cache largely masks the difference in memory speed; see the tests that follow.

Moreover, when more memory is needed, more memory always trumps memory speed. By the same token, if 64GB is already ample, going to slower-speed 128GB memory is not a win. In short, 128GB is for computing tasks with large data sets, such as huge Phtooshop files, large 3D modeling jobs, databases with large in-memory caches, etc.

* The diglloydTools MemoryTester 'stress' command uses memcpy() with multiple CPU cores to simulate real world computing jobs that are memory intensive.

64GB vs 128GB memory bandwidth
2013 Mac Pro memory bandwidth with 1866 MHz 64GB kit vs 1066 MHz 128GB kit

Additional notes on the OWC 128GB memory kit

  • The OWC 32GB modules (4 X 32GB = 128GB) are manufactured using 1333 MHz parts, but run at 1066 MHz due to technical limitations.
  • The 32GB modules can be mixed with 16GB modules, so (for example), a 96GB configuration is possible (2 X 32GB + 2 X 16GB).
  • While a single 32GB module should function (mix) with the 16GB modules, OWC advises pairs of matched modules.

Save the tax, we pay you back, instantly!
View all handpicked deals...

Samsung 2TB T5 Portable Solid-State Drive (Black)
$390 $270
SAVE $120

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__