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 2019 iMac up to 128GB
Handpicked deals...
$1299 $1169
SAVE $130

$380 $280
SAVE $100

$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 $1588
SAVE $411

$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 $898
SAVE $301

$1349 $1049
SAVE $300

$997 $897
SAVE $100

$2099 $1699
SAVE $400

$1999 $1369
SAVE $630

$1999 $1599
SAVE $400

$1999 $1588
SAVE $411

$1329 $929
SAVE $400

$4499 $3999
SAVE $500

$329 $329
SAVE $0

$1499 $999
SAVE $500

$1399 $1099
SAVE $300

$1499 $1299
SAVE $200

$2199 $1999
SAVE $200

$3399 $2199
SAVE $1200

$1279 $719
SAVE $560

Case Study of Mac Pro Memory and Photoshop CS5 Performance

Last updated 2010-10-25 - Send Feedback
Related: how-to, Mac Pro, memory, Photoshop, software

The diglloydMedium benchmark requires 15.8GB of real for Photoshop CS5 to run efficiently. Therefore, something more than 16GB of installed memory is required to make it run efficiently.

Comments follow.

Execution time in seconds for various memory configurations (problem size requires 15.8GB memory)
(averaged over 5 iterations after a prior warmup)

Key observations

More is generally better, but there are threshold effects and subtleties:

  • The absurd 3GB configuration kills performance; any extra memory helps considerably.
  • ENOUGH memory drops the time off a cliff: 24GB runs in less than 1/3 the time of 16GB.
  • More than ENOUGH is not always helpful; 32GB is slower than 24GB in this case, because it reduces memory speed.

ENOUGH memory means that the particular task involved has its needs fully satisfied with memory to spare for other system activities.

Using 32GB instead of 24GB reduces performance by 2.7%. That’s because 24GB is already ENOUGH, and 3 X 8GB runs in triple channel mode, yielding faster memory access times the dual-channel mode used with 4 X 8GB.

HOWEVER, if the problem size were to increase to about 24GB or larger, then the 32GB configuration would be much faster, because the ENOUGH criterion would not have been satisfied with 24GB.


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

Samsung 2TB T5 Portable Solid-State Drive (Black)
$380 $280
SAVE $100

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__