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is it possible to make windows only see & use 6gb mem on gtx 1080 cards ?

post #1 of 16
Thread Starter 
is it possible to make windows only see & use 6gb mem on gtx 1080 cards ?

As I would love to reduce the 8gb of shared memory to 6gb.
I have 16gb of ram and is bottle necking my system when gaming in 5K with 4 X DSR factor on a 1440p monitor with 2XSLI
    
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post #2 of 16
wth.gif

Restricting your graphics card or Windows from using some of its memory will not improve performance.
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post #3 of 16
Thread Starter 
Not trying to Restricting anything :-)
Why would a game that uses 4 or 5.5GB of Vram performance worse with 6gb of shared mem vs 8GB ?
    
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post #4 of 16
what?
post #5 of 16
Quote:
Originally Posted by Spieler4 View Post

is it possible to make windows only see & use 6gb mem on gtx 1080 cards ?

As I would love to reduce the 8gb of shared memory to 6gb.
I have 16gb of ram and is bottle necking my system when gaming in 5K with 4 X DSR factor on a 1440p monitor with 2XSLI

It is not the VRAM on the video card that is bottlenecking your system, I've never heard of anything close to what you claim. It's just most likely that 1080s in SLI can not push every game to the max in 5k resolution.
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post #6 of 16
Quote:
Originally Posted by Spieler4 View Post

Not trying to Restricting anything :-)
Why would a game that uses 4 or 5.5GB of Vram performance worse with 6gb of shared mem vs 8GB ?

If you physically removed 2GB of Vram from each graphics card and your games are never using more than 5.5GB Vram, performance would be 100% identical to the dot. Still not sure what you're wanting to achieve.
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post #7 of 16
Thread Starter 
I am just asking :-)

When gaming in 5k resolution 4x DSR factor on 1440p monitor in win 10 my games crash, but no problem in win 7
in win 10 : If I tick VR ready button in MSI gaming app.Games work without crashing and in game I can see less ram utilized than under normal use

If I have 16GB ram and Vram is 8GB shared. Only 8 Gb is left for windows and applications
If I have 16GB ram and Vram is 6GB shared. 10 GB is left for windows and applications

But I guess I just have to enable VR ready i msi gaming app. if i want to game in win 10 :-)

Sry for my bad english
    
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post #8 of 16
That's not how that works....
post #9 of 16
Quote:
Originally Posted by Spieler4 View Post

is it possible to make windows only see & use 6gb mem on gtx 1080 cards ?

As I would love to reduce the 8gb of shared memory to 6gb.
I have 16gb of ram and is bottle necking my system when gaming in 5K with 4 X DSR factor on a 1440p monitor with 2XSLI

If I understand what you're saying correctly, you want to limit the VRAM usage because it's shared with the main system memory?

Not how it works. Integrated graphics such as Intel HD and AMD APUs share memory with the CPU. However, dedicated PCIe GPUs such as the 1080 have their own dedicated VRAM. You've got 16GB of system memory as well as 8GB on each GPU (though since SLI mirrors the contents of VRAM rather than adds it across GPUs, you only have 8GB usable rather than 2x8=16GB). Look here:




The circled chips are VRAM chips used only by the GPU. Until more than 8GB of VRAM is needed, system memory will never be touched, since it can all fit on the GPU itself.

I think what's happening is that the GPUs just aren't powerful enough to run 5K. 5K is to 4K as 1440p is to 1080p, about twice the pixels, and a single 1080 still isn't enough to max out games running 4K @ 60FPS. You're rendering a massive image and the technology just isn't there yet. Try running at just 1440p and see what happens. I doubt you'll notice a huge difference honestly.
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post #10 of 16
RAM and VRAM are separate. It works nothing like what you just described.
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