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Getting Conflicting Status on VRAM

kyoto kidkyoto kid Posts: 41,249
in The Commons

...OK, this is interesting  

Been getting some conflicting specs on available VRAM.  Both the Nvidia Control Panel and GPUZ it indicate I have the full 12 GB available on my Maxwell Titan-X,  However, before running a render process, I opened the MSY Afterburner console to adjust fan speed and noticed in the information window that under memory it only indicated a maximum of  8 GB available.

Now I'm running W7 Pro 64 so WDDM isn't the reason for the difference as both GPUZ and MSY Afterburner indicate about 135 MB of memory used in idle mode (which is about right for W7) so a little perplexed as to what is going on.

Comments

  • nicsttnicstt Posts: 11,715

    faulty ram on the card perhaps?

    make a scene you know will take above 8GB

  • kyoto kidkyoto kid Posts: 41,249
    edited February 2021

    ....not sure because sensors on other utilitiies indicate the full 12288 MB.

    Post edited by kyoto kid on
  • Ghosty12Ghosty12 Posts: 2,065

    Sounds like the MSY software could be faulty, if the two other programs say otherwise.. May want to get HWInfo and see what that says..

  • kyoto kidkyoto kid Posts: 41,249
    edited February 2021

    ...just popped that in and it indicates 12 GB GDDR5. 

    Wish I still had my railway station scene, that would definitely be a good test as in system RAM it's about 8.9GB. Sadly it was lost in the drive crash.

    Sort of confused by the different readings in the monitor window.  There is the  Memory Usage graph which I have bene going by just above the Core Clock one but lower down there are two additional graphs labelled GPU1 Dedicated Memory and GPU1 Shared Memory. Both of these also indicate 8GB (8192)  Not sure what tehse refer to (wish there was a PDF guide that gave full details, all I can find online are guides on how to use it for overclocking).

    One interesting bit, After I entered the same question as the title of this thread, there was a link to the EGVA Forums where I found others having the same issue and one response was that the maximum is be user defined (there is a field to enter change this on the Monitoring Tab in Properties)but this seems rather arbitrary).

    Post edited by kyoto kid on
  • jbdiminniejbdiminnie Posts: 90

    I run MSI Afterburner as well with my Pascal Titan X (12 GB).  The VRAM graph shows a scale with max of 8192, but when the card is running it will still output a result above that (I think the 8192 is a default scale parameter and not your actual memory available).  Recently I was rendering a large scene and that graph was maxxed out but showing 10.4 GB VRAM usage (I also opened up the Windows 10 Task Manager Performance tab and it also showed 10.4 GB VRAM usage), so you should have your full 12 GB available (less the amount reserved by WDDM) for renders.  I wish there was a way to manually increase the scale parameter limits but haven't found a way yet.

    I'm also running the beta version of Afterburner and I just noticed it shows GPU and CPU power consumptions as well--very nice to see how much power I'm pulling on my PSU.

  • kyoto kidkyoto kid Posts: 41,249
    edited February 2021

    ...as I am running on W7 Pro WDDM is pretty much negligible.

    Still not sure what the graphs for GPU1 (Dedicated and Shared Memory) refer to. 

    Also don't know why there is a fair amount of activity on the CPU and system RAM graphs while rendering. The scenes I've been rendering certainly haven't fallen out of VRAM.  System RAM use swells from about 5 GB total (for everything including OS and utilities) before rendering to over 8 GB. according to Task Manager.

    Post edited by kyoto kid on
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