nvidia gpu full screen resolution huge fps drop

[alexelgayar]

my specs :
asus r510jk
intel core i7
nvidia gtx 850m (i also have intel hd graphics 4600)
ask me if you need more specs
ok , so the main problem is that when i am playing game , when i bigger the window the fps drop and when i play full screen its a huge drop , i tested it in minecraft : small window around 1700 fps
and big window around 700 fps and full screen i get maximum 200fps .. and yes , when the game is bigger , it is higher resolution (my default resoltion is 1920 x 1080 ) so from intel gpu control panel i set my resolution to 1600x900 and scale : fullscreen , now i try to play the game , small window 854x400 resolution and big window 1600x810 and i set full screen to 854x400 with full screen scale ( so full screen displays on all my pc screen ) .... in ful screen i get 200 fps with this low resolution so i dont know what is the problem with full screen .... so it is not logic at all because maximized window mode 1600x810 resolution gets me 700-800 fps and full screen mode 854x400 resolution gets me 100-200 fps and the small window same resolution as the full screen 854x400 gets me 2000+ fps... i also tried with max performance and max quality ( max quality makes the full screen 854x400 quality better nothing else ) so please i need help with that cause i want to understand what is happening and also if i can change the display options from my nvidia control panel instead of he intel control panel it will be better .. thanks

 

[g1abhi]

You are getting totally fine FPS. when you increase your resolution , your pixel count increases square times (remember area of a sqaure increases squarer times the change in sides when its sides are increased. Hence your fps will drop at a rate of square root.
edit : i misread it initially. I think when you launch it full screen , it uses intel grphics. Try forcing the game to high performance in nvidia control panel.

 

[alexelgayar]

i tried o use the intel hd graphics to run all java applications (minecraft is one of them) and i tried the full screen and got MUCH more fps idk how and why but i got 1000 fps in full screen and 3000 fps in small window ... i think that intel hd graphics 4600 is way better than nvidia gtx 850m .. atleast it can handle resolution ( i have everything highest performance in nvidia control panel same for intel control panel ).. now i think ill use the intel hd graphics for games ..

 

[alexelgayar]

You are getting totally fine FPS. when you increase your resolution , your pixel count increases square times (remember area of a sqaure increases squarer times the change in sides when its sides are increased. Hence your fps will drop at a rate of square root.
edit : i misread it initially. I think when you launch it full screen , it uses intel grphics. Try forcing the game to high performance in nvidia control panel.

minecraft tells me wich graphic card its using and ful screen or not its using nvidia

 

[alexelgayar]

i have 1 more question , is it normal that when resolution goes from 854x400 to 1600x900 fps drop by 60% ?

 

[g1abhi]

MAthematically , (1600*900) / (854*400) = 4.21
Hence your GPU has to render 4 times more pixels so technically your fps should be around 25% (75% drop ) if taken linearly , but it is still 60% due to some calulations which are not scalable linearly and are rather constant .