DSR down scaling question

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8 Dec 2008
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East yorkshire near hull
I have been using down scaling a bit recently via the custom resolution setting and been quite happy with the result on certain games.

However i been trying the nvidia DSR option and i noticed it seems to lower fps around 20 fps compared with the custom resolution option and seems to add extra gamma or brightness to games.

I have a 770 sli set up only the 2gb version which i know will limit me a lot but just wondering why the difference in fps between the 2 methods is so great.
 
It might be the algorithms that NVIDIA use to scale the resolution taking more gpu power and hopefully it will improve with time and new drivers
 
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