Topic: 7770 slow

[pr0zac]

Hi!

A customer of mine has a Lumion V3.0.1 license and bought a new system to make the projects render faster in realtime.
The new system has a Crossfire system running two Sapphire 7770s. The performance is abysmal, especially when using lights (e.g. spotlights).

Another system has a single GTX 560 card, which is way faster, reaching almost 30FPS in the same scene, while the 7770 renders at 1FPS at best. The single 7770 should be faster than the 560 (in normal conditions), right? XFire didn't help.

I recently tried with Catalyst 12.10, instead of 13.1 - no changes.

Any clues? Thanks.

[Gga_Mars]

http://www.videocardbenchmark.net/high_end_gpus.html

Seems that 7770 is weaker than GTX 560...
Forget sli/Cross fire configuration .

Cheers

PS: Don't feed your computer with prozac, it will not make it running faster....

[pr0zac]

PS: Don't feed your computer with prozac, it will not make it running faster....

Yep, I tried that too 

Anyway, both cards (nvidia/amd) should run render the scene at compatible speeds.
The 7770 runs at less than 1 FPS - it's something in the drivers or with Lumion.

Hints?

[peterm]

The general performance measures used to gauge GPU speeds from Passmark indicate that  the 7770 is not very fast at 2147, and the GTX 560 is 3058.  So that's a base increase of 40+%. 

The 7770 card is above minimum specs recommended for Lumion 3, but not by too much: MINIMUM HARDWARE REQUIREMENTS FOR LUMION 3  in LUMION 3: Minimum hardware requirements

Please also see CHECK YOUR PASSMARK SCORE  in LUMION 3: Minimum hardware requirements which provides an indication of relative Passmark scores against complexity of scenes.

Lumion is not able to take advantage of dual cards in either Crossfire for Radeon, or SLI for NVIDIA.  See MULTIPLE GRAPHICS CARDS (SLI) AND CARDS WITH MORE THAN 1 GPU in FAQ topic: LUMION 3: Minimum hardware requirements

GTX cards also tend to work slightly better and faster in Lumion than Radeon due to some differences in drivers.

Your client should upgrade, if they have not done so, to the most recent version of Lumion v3.1.2.  There were performance improvements in v3.1 over v3.0.1 especially in regard lighting and GI affecting render performance etc.

In addition, there are recommended practices to optimise render performance when using lights, and hopefully your client is following those to help improve render speeds. LUMION 3: How to reduce render times

[pr0zac]

Thanks for your help.

[Daman-Lechtenberger,PC]

3.0.1 wasn't that the hacked version that was out on that cg site. Anyone running 3.0.1 should be a pro user since the free version didn't hit till 3.1.0.

Maybe a license check is in order?

Anyway, if you read the forum you would know crossfire or sli mode is not gonna do crap as lumion runs on a single gpu. In my personal experiences nvidia cards kill ati hands down.

If you do, or are able to upgrade to 3,1,2 they have adjusted settings to allow the cards to run smoother. Also take your desktop resolution down to 1024x768 and adjust the setting in lumion to half, it will be a bit fuzzy but you can still get work done the export.

I do this with my notebook, it went from 1500 to 2300 on the benchmark test, but I think that was in 3.1.0.