GPU acceleration not working in latest Release

12 replies
1117 views
Translate

Hi, in the latest version 14.5.1 the GPU shoud accelerate previews and exports. However, my Nvidia 5070 TI with 16 GB Ram is ideling with 1-15% during previews and export although it is enabled in the lightroom settings. CPU (i9-9900KF) is running at 80%.

How can I enable lightroom to use the brand new GPU?

Windows

johnrellis

Legend

There are many parts of building previews that can't be effectively executed on the GPU -- reading the original photo from disk, parsing it, interpreting the develop settings and preparing them for execution on the GPU, writing the results to disk, updating the database indexing the previews. Similarly for exporting.

What's more important than relative GPU/CPU utilization is whether you get a significant speedup when the option Preferences > Performance > Use GPU For Preview Generation is enabled. I just tested on my Macbook Pro 2023, and building standard-sized previews for 250 raws from diverse cameras goes 1.76 times faster with the GPU enabled (16.4 photos/sec versus 9.3 photos/sec). (The raws were stored on an internal SSD.)

Exporting those raws goes 3.3 times faster (0.86 sec/photo versus 3.8 sec/photo).

What numbers do you observe?

Translate

E

Emilia34645157h2zwAuthor

Participating Frequently

Previes are generated 2 times faster with GPU than w/o. But giving the fact, that the CPU is not the newest, this is not great. Raws are stored on a raid array with a server high performance raid controller.

Translate

johnrellis

Legend

"Previews are generated 2 times faster with GPU than w/o. But giving the fact, that the CPU is not the newest, this is not great."

I haven't seen any reports of previews getting sped up much more than 2x using the GPU. How many previews per second with the GPU enabled?

Remember that the GPU and CPU work in tandem and that the CPU prepares all the work for the GPU. The limiting factors could include the CPU speed, the practical (not theoretical) memory bandwidth between CPU and GPU, and the speed of reading and writing to images to disk. If the images are stored on a spinning disks, and the raws are say 40 MB each, then LR won't be able to read more than about 5 per second (unless you have RAID 5 striping across 3 or more disks).

Translate

A

AxelMatt

Community Expert

Check if you have buldin a CPU with an internal graphic processor. If yes, disable the processor internal graphic card. The internal GPU can sometimes caused several issues. Open the Windows Device Manager, right-click the card's name and choose Disable.

Translate

My System: Intel i7-8700K - 64GB RAM - NVidia Geforce RTX 3060 - Windows 11 Pro 26H2 -- LR-Classic 15 - Photoshop 27 - Nik Collection 9 - PureRAW 6 - Topaz Photo AI