32 Bit vs 64 Bit Version & What powers the UI

notiusweb

Okay, so let's put rendering aside (Iray, and in my case as well, an Octane Render Plugin), and any plugins not available in one version (ie Lip Sync) aside.  I am going to ask a question strictly related to the scene creator/UI viewport of Daz...

Has anyone ever found a true performance difference in using the 32 bit vs 64 bit versions?  Like, did you ever see a scene crawl in 32 bit but then blaze fast in 64 bit, or was their crashing, UI lag, etc in 32 that was not there in 64 bit?

The reason I ask is because I am using a rig of multriple GPUs, and I found that when using the 64 bit version (be it because of Iray process in background, some Octane Render plugin process in background, or some advanced multi-GPU feature of the 64 bit version, that the TDP and temp rises for all GPUs, not just the primary display one, even when using strictly the UI in texture shaded mode, with no rendering.  But, if I use the 32 bit mode one, only the primary display GPU card gets a rise in TDP and temp.  As such, I would imagine possibly better to set scene in 32, save, then re-open and render in 64 bit version.  But, curious about what performance issues I am going to come accross, if any.  (Like is the CPU accomplishing less on 32 than on 64).

I guess a second question would be, is the UI being powered by the GPU in conjunction with the CPU, or is it just CPU.  Like, does VRAM or GPU clock speed matter as far as setting up a scene of figures in texture-shaded mode without ever rendering, or is it all CPU.

Thanks for any thoughts!  Regards!

 

 

namffuak

notiusweb said:

Okay, so let's put rendering aside (Iray, and in my case as well, an Octane Render Plugin), and any plugins not available in one version (ie Lip Sync) aside.  I am going to ask a question strictly related to the scene creator/UI viewport of Daz...

Has anyone ever found a true performance difference in using the 32 bit vs 64 bit versions?  Like, did you ever see a scene crawl in 32 bit but then blaze fast in 64 bit, or was their crashing, UI lag, etc in 32 that was not there in 64 bit?

The reason I ask is because I am using a rig of multriple GPUs, and I found that when using the 64 bit version (be it because of Iray process in background, some Octane Render plugin process in background, or some advanced multi-GPU feature of the 64 bit version, that the TDP and temp rises for all GPUs, not just the primary display one, even when using strictly the UI in texture shaded mode, with no rendering.  But, if I use the 32 bit mode one, only the primary display GPU card gets a rise in TDP and temp.  As such, I would imagine possibly better to set scene in 32, save, then re-open and render in 64 bit version.  But, curious about what performance issues I am going to come accross, if any.  (Like is the CPU accomplishing less on 32 than on 64).

I guess a second question would be, is the UI being powered by the GPU in conjunction with the CPU, or is it just CPU.  Like, does VRAM or GPU clock speed matter as far as setting up a scene of figures in texture-shaded mode without ever rendering, or is it all CPU.

Thanks for any thoughts!  Regards!

 

 

Well, first and foremost, 32-bit limits you to a maximum of 4 GB for the scene - including memory for the render, if you kick it off while in 32-bit studio.

There were issues earlier with the Nvidia driver that just loading Iray would initialize ALL cards and bring the clocks up to speed - even if the cards were not flagged as available to Iray in Studio - so if you haven't updated the driver lately - do so (last two months or thereabouts - I forget which version cleaned up the initialization). Studio drives the UI with OpenGL which has a minimal impact on the GPU from a heat/power standpoint, but it will chew up between 100 and 500 MB of Vram on the card driving the monitor(s) depending on monitor size, lights, and scene complexity - and anything else you might be running. All the UI performance is CPU except for the actual presentation to the monitor.

Also, if you haven't done it already, use the software that came with your card(s) and set up a custom fan profile. AFAICT, Nvidia specs the cards to pretty much run at thermal maximum out of the box and ramping the fan speed up sooner can drop the temperatures by nearly 25%.