Down-Scaling

[Amromnia]

So i had an old Gaming PC  and it broke and i am building a new PC when i first built the old PC i bought a monitor with it now this monitor's resolution is 1600x900 at the moment i built the old PC it was good and most games ran at this resolution as its maximum now i want to Game at 1080p however the money i have right now isn't that much it barley is enough for the PC so i am not buying a new monitor I have two choices either i use my 1920x1080 TV or i use the Monitor and down-scale the image to 1920x1080 i wanna know which is the better choice then i wanna know how to down-scale the whole system not only the game using the gtx 960-rx 480 or gtx 970 to 1920x1080 or (if possible) 2560x1440 or higher resolutions. 

Thank you All 

p.s sorry if this is not the correct forum to post this in.

[ComradeVodka]

If you want to do serious gaming like CSGO stick with your 1600x900 monitor. TVs tend to have severe input lag (I used to have one that had 70ms which is massive input lag, really noticeable) and monitors do not. ALso downsampling gives you more control over the rez you want

[thatguyjerry]

what is the monitor you have?

[Amromnia]

so whats better for down-scaling gtx 960 or gtx 970 or rx 480  

 

edit: and also can it render resolutions higher than 1080p like 1440p or 1600p or even 4k and which GPU is better for higher resolutions

 

edit 2: my CPU is either i5 6600 or i7 4770 so tell me which is better for gaming/editing and if it affects the after down-scaling performance and frame rates

[Amromnia]

1 hour ago, thatguyjerry said:

what is the monitor you have?

a view sonic lcd 1600x900 monitor that i bought about 8 years ago