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Downsample question

Soldato
Joined
15 Nov 2009
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little bit of a long one but bear with me :) I've been using Downsampling on my GPU since I got it because I'm too skint to upgrade to a nice new monitor just yet. Currently I'm using a 720p screen (1360x768) and running all my games @ 1920x1080 , they all look better and most 99% of my games run above 60fps so all is well there. BF4 is another matter, I was hoping for ultra @ 60fps but currently have lower.

found this calculation online:

"Lets say your at 1080p your PC runs around 60fps for a game

At 720p your PC would run higher than that (possibly 100+ fps)

Using a 720p monitor and downsampling from 1080 would yield what as your downsampled framerate? (ugh math)

1080/720 = 1.5

1920/1280 = 1.5

1/(1.5 + 1.5) = 1/3 so a 33% loss of FPS 60-19.8 = 40.2FPS on the downsampled game."

Ok great I knew downsampling had a performance hit and have not been that worried about it. My actual question though is if I upgraded to a 1080p screen assuming I went from 720p res>1080p res what would the performance hit be roughly? and would my FPS increase at all over running downsampling :confused:
 
no worries, just checking. I know my question is a little confusing :) ps. resolution scaling on BF4 can anyone explain it, maybe thats the cause of my FPS drop more than downscaling (Had it set @ 145% now its 120% and gave me more FPS) its possible with downscaling active I only need it at 100%?
 
Nice I shall give it a play around, but certainly seems the way to go thank you. Been trying to get an answer on that slider all morning :D
 
Just render it at 720 with 4xAA that will look better than down-sampling and give you better fps surely??

nope down-sample will still look 100x better, certainly not better fps but comparable and nothing major (I expect to be at 60FPS avg eventually after tweaking ^^)
 
basically because with down-sampling you are rendering more pixels for the image (1.5x more from 720p>1080p) then scaling that down to your resolution you end up with a crisper and less aliased image. Things look sharper and more detailed

thats as far as I really understand the voodoo magic that is down-sampling


tried setting resolution scale to 100%, totally increased my FPS loads. Still not perfect for me, but a few tweaks and it'll be golden. using 4XMSAA now too!
 
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