GTX960 Lightroom issue

igs000

Junior Member
Oct 3, 2015
4
0
0
Hi all. I'm using the following components:

Phenom II x945
ga-ma790xt-ud4p
Radeon 4770 512MB / GTX 960 Strix 2GB
RAM 4GB CL9 / 8GB CL10
Windows 7

I upgraded my graphics card from 4770 to 960 and my RAM from 4 to 8GB. The new parts work fine in most jobs (all desktop use, Photoshop, games). But I have the following problem:

When exporting a video from Lightroom and using GTX 960, the process takes a looooong time and uses up all available RAM, almost freezing my computer.

So I did some tests:

GTX 960 and 8GB RAM CL10
Premiere video export: 4 min and 10 sec
Lightroom video export: 1 hour and 10 min to reach 75% (I didn't have the patience to wait until the end)
- here Lightroom used full 8GB of RAM and 0% GPU

GTX 960 and 4GB RAM CL9
Premiere video export: 4 min and 40 sec
Lightroom video export: 50 min to reach 75%
- Lightroom used full 4GB of RAM and about 33% GPU

Radeon 4770 and 4GB RAM CL9
Premiere video export: 4 min and 45 sec
Lightroom video export: 10 min and 10 sec to complete
- Lightroom used only 2.25GB of RAM and about 40% GPU

The CPU on all tests was never 100% use, between 60-80%.

Why does Lightroom video export take so long with GTX 960 and so quick with the old 4770? Why does having GTX 960 in system force the program to use max amount of RAM?

Any ideas?
 

Techhog

Platinum Member
Sep 11, 2013
2,834
2
26
Try a clean install of the graphics driver first. Use DDU to uninstall the driver in safe mode, then reinstall it.
 

igs000

Junior Member
Oct 3, 2015
4
0
0
Will do a driver reinstall, but the real question is: Lightroom 5 uses no graphics acceleration at all, so why does it matter which graphics card is attached? When I put back the 4770, works like a charm.
 

shady28

Platinum Member
Apr 11, 2004
2,520
397
126
960/970 are Adobe's rec for Lightroom 6.

High probability that the older Lightroom 5 simply doesn't have the 960 listed as a supported card, given that it came out 2 years before the 960.

From Adobe's site :

How to determine if Lightroom is accessing the graphics processor (GPU)

When Lightroom is able to use the GPU, the checkbox "Use Graphics Processor" is selected in the Performance pane of Lightroom's preferences. To access Lightroom's Performance preferences:

Mac OS:

Lightroom > Preferences > Performance

Windows:

Edit > Preferences > Performance
 

igs000

Junior Member
Oct 3, 2015
4
0
0
Thanks shady28 for the effort. Lightroom 6 does use GPU, but only for Develop module, says Adobe. I tried with L6 with GPU on and off, no change. When I use the Radeon 4770, RAM use is constant at around 2.25GB and takes around 10 min to do the job. With the 960, RAM use starts out in short jumps and drops and then proceeds to use max available RAM while the job takes an average of 50 mins.

Here's what the RAM wave looks like with 960:

juxyqp.jpg


9vbceh.jpg
 

Bearmann

Member
Sep 14, 2008
167
2
81
Are you using the most recent ASUS drivers for your Strix, and not the Microsoft ones?
 

igs000

Junior Member
Oct 3, 2015
4
0
0
Absolutely, direct from Nvidia site. Card is being tested at service center as we speak.