Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
Amazon
As an Amazon Associate I earn from qualifying purchases.
Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$3049 $2399
SAVE $650

$3498 $2998
SAVE $500

$998 $848
SAVE $150

$3999 $2998
SAVE $1001

$2299 $2299
SAVE $click

$1597 $1297
SAVE $300

$80 $33
SAVE $46

$2299 $2299
SAVE $click

$1898 $1498
SAVE $400

$2799 $2799
SAVE $click

$2299 $2299
SAVE $click

$600 $400
SAVE $200

$240 $175
SAVE $65

$699 $499
SAVE $200

$270 $270
SAVE $click

$1599 $1398
SAVE $201

$2027 $1397
SAVE $630

$1699 $999
SAVE $700

$180 $100
SAVE $80

$1199 $1099
SAVE $100

$1199 $1099
SAVE $100

$999 $949
SAVE $50

$270 $270
SAVE $click

$1699 $999
SAVE $700

OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!

More CPU Cores Can Be Slower

2011-01-27 - Send Feedback
Related: CPU cores, Photoshop, software

My contacts at Adobe asked me in January 2011 whether anything had changed with respect to my "12 cores are slower than 6" findings that I first reported back in April 2010.  Regrettably, nothing has changed.

The results shown below are consistent and repeatable over the past 9 months. Watching the two Mac Pro models go at it simultaneously makes it self-evident just how much slower the 12-core model runs. To my knowledge, Adobe has yet to formally acknowledge this issue.

This puzzling performance hit is a Photoshop-specific  issue. It does not apply in general, certainly not to programs that are written to use multiple CPU cores efficiently.

Ironically, disabling half the CPU cores with a developer tool so that Photoshop sees half as many cores, speeds up Photoshop on the 12-core machine!

There is a prima facie assumption that a 12-core machine should be as fast or faster than a 6-core machine, especially when configured with 48GB memory (vs 24GB for the 6-core), yet it is far slower.

In the real world, more cores means that code must be written with skill to avoid the pitfalls that await multi-threaded code.  Code that ran well on 2 or 4 cores can show its limitations quickly at 6 cores and beyond (as your author well knows, having been a professional software architect for over two decades).

Photoshop CS5 performance of two 3.33GHz Mac Pros, one with 6 cores, and one with 12 cores
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!

Deals Updated Daily at B&H Photo

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__