All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com
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...
$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

$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

$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

Gobsmacked: Power Efficiency of the 2017 iMac 5K vs 2015 iMac 5K, Particularly on the Road in Sprinter Van

Recently I bought a 2017 iMac 5K for solid reasons.

See also Using Two Thunderbolt 3 Ports to Build Out a System and Options for Connecting a Display with Mini DisplayPort or DisplayPort input to a Mac with Thunderbolt 3 / USB-C.

One significant concern was an increased power budget including the need to use an OWC Thunderbolt 3 Dock in order to connect my NEC PA302W wide gamut display (the Dock supplies the necessary Mini DisplayPort port).

My thinking was that if the Dock chewed up another 10-20 watts, this would reduce on-the-road battery life in my Mercedes Sprinter photography adventure van (see the desk layout in my Sprinter van).

I need not have worried, in fact I was gobsmackked by a power savings with the 2017 iMac 5K, even with adding the OWC Thunderbolt 3 Dock, which consumes power of its own. The results were stunningly favorable: my runtime has increased*, not decreased:

2015 iMac 5K alone, idle with lit screen: 60 watts AC
2017 iMac 5K alone, idle with lit screen: 48 watts AC

2015 iMac 5K + NEC PA302W 142 watts AC
2017 iMac 5K + Thunderbolt 3 Dock + NEC PA302W = 122 watts AC

OWC Thunderbay 4 TB3: 24 watts AC with 4 idle but spinning 12TB drives

Wow! Even adding the Dock, the configuration with the 2017 iMac 5K draw 20 watts less power. Sweet.

Presumably the 2017 iMac 5K not only draws less power overall (CPU, memory, etc), its GPU must be more efficient also, taking less power to drive the external display. I’m psyched.

Assuming average power consumption (idle + active usage) of 200 watts @ 12V DC draw on the battery, and drawing the battery down by 90% (10% reserve), I can run for 23 hours without any idling alternator charging (5120 watt hours X .9 / 200 watts = 23 hours). Not bad! See RV Electrical: Calculating Realistic Electric Load.

* All figures above are AC power; add 30 watts for power inverter overhead for DC power draw, which is what really matters to how long the 5 kW battery will last.

Configuring the 2017 iMac 5K as a system

See Switched to 2017 iMac 5K as Primary Machine: Details on Gear I’m Using.

Below, the storage for home and travel:

CLICK TO VIEW: Configuring my 2017 iMac 5K

The iMac 5K along with the NEC PA302W and the Apple Thunderbolt 3 Male to Thunderbolt 2 Female Adapter.

CLICK TO VIEW: Configuring my 2017 iMac 5K and Various

Apple 13-inch MacBook Pro
Only $1799 $1149

8GB / 256GB SSD / 2.3 Ghz Intel Core i5

Apple Refurbished Factory Sealed
Apple 1 Year Limited Warranty
Awesome for a student!

MacPerformanceGuide.com
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__