Upgrading from 1440x900 to 1920x1080

[Eidoss]

Hello, I've been thinking about buying a new monitor, a 1080p monitor, I found a pretty cheap BenQ monitor http://www.benq.com/product/monitor/vw2245z/
But my question is how much FPS will I lose?
PC Specs:
Gigabyte H81M-DS2V
Patriot Viper 3 Venom Red Edition 2x4GB @ 1866MHz
Sapphire R9 270X 4GB GDDR5 with boost & OC
Intel Core i3-4130 @ 3.40GHz (4 CPUs)
OCZ Fatal1ty 550W
Windows 7 Ultimate 64bit

Some benchmarks I did with this 1440x900 monitor:
(avg. FPS)
Far Cry 3 - 67
Bioshock infinite - 102
GRID2 - 62

And it's great, works really well didn't have any issues with it, I'm expecting to lose like 35 FPS? I don't know that might be a bit too much I know I definitely won't be able to run newer games on ultra, I can still keep this monitor can use it as a 2nd monitor...

 

[sincreator]

All three games are tested in this review of the r9 270x. Just look at the 1080p results as a comparison. Keep in mind that in some of those games your i3 may be holding you back a little bit.

http://www.techpowerup.com/reviews/AMD/R9_270X/

 

[Eidoss]

All three games are tested in this review of the r9 270x. Just look at the 1080p results as a comparison. Keep in mind that in some of those games your i3 may be holding you back a little bit.

http://www.techpowerup.com/reviews/AMD/R9_270X/

I don't know maybe 1080p is a bit too much for my GPU if I do get the 1080p monitor, my GPU will become useless in 2 years, as it won't be able to run those games... I might get the 1600x900... So i'll still have 2 monitors and I might get away with playing some older games on 2 monitors, that would be pretty cool.