What happens once video memory is exceeded?

devavictrix

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Nov 30, 2014
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The only games I own and play are GTA V and Simcity. When I set GTA V to maximum graphics settings (except MSAA is at x2, not x8) the game reports that it needs 2.7GB of RAM but my graphics card only has 2GB. Despite this discrepancy I am still able to achieve 50fps.

MSI afterburner says I am almost always using all of my 2gb of RAM so what is being used for the extra 700mb? Is my system RAM taking up the slack or the pagefile on my harddrive?

I am asking because I only have a 128GB harddrive and GTA V takes up 70GB of this so I am thinking about moving GTA V to a second, albeit slower, harddrive.

My C: is pretty quick (reads 2900-3150mb/s and writes 700-900mb/s). The spare drive I have would be two 60gb SSDs in RAID 0 that only benches at 600mb/s reads and 200-300mb/s writes (yup, in RAID 0).

Am I likely to lose performance by installing the game on the slow RAID 0 setup?
If the game uses a pagefile will it use the system pagefile on the C: (the NVMe drive) or will it use the drive that the game is installed on?
Or, will the game use the system RAM for the extra 700mb/s and will using the RAID 0 drive as an installed directory be more than adequete for maintaining the performance I currently achieve?

I am worried ill spend an age installing the two SSDs, building an array and transferring 70GB of data only to find that the game now plays at lower fps (or at lower graphics settings) and ill end up wanting to transfer everything back to the C:!

Thank you
 
Solution
Typically System Ram is used as a cache for when the Video Card memory becomes full. Page file memory would be way to slow, even if the page file was on an SATA SSD or even an NVME PCIe SSD.

devavictrix

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Nov 30, 2014
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10,640
Thank you for your reply.
Ive done a bit more reading up and it seems once you are playing the game the harddrive performance doesnt matter so much. Apparently loading times are what are likely to be hit.

Thanks
 

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