> > Look at the guest Computer/Properties/Device Manager/Display > Adapters/VirtualBox Graphics Adapter/Driver/Driver Details > XPDM files are VBoxVideo.sys and VBoxDisp.dll > > XPDM requires less guest VRAM, it mostly needs VRAM for the screen > surface. With 256MB of VRAM it is able to support 24 or 25 monitors at > 1920x1200x32 each. > One screen needs ~9MB, which gives a hard limit 256/9 ~= 28 screens. But > since some VRAM is needed for other purposes, it is better not to use > the maximum. > The performance will be probably a bit worse compared to the case when > each guest screen has enough VRAM for a full resolution offscreen surface. > > I just tested a VBoxHeadless VM with 24 monitors at 1920x1200 and 256 MB > of guest VRAM and it seems to work fine.
Thanks a lot, I'll try that out, I guess, since I checked the Direct3D support in the guest additions I could be using WDDM, I'll verify it and if so make a clean install and try XPDM. Since my current test wall is 5x5 25 would be great. I simply got confused when I found the code i pasted here in a post above in the Qt GUI that does a hard multiplication with 3 to calculate the needed video memory. Rudolfs
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