I have a 5570 low profile sapphire video card. I normally ran like 40 fps on ultra with a 19 inch monitor. The monitor died . I'm now thinking of buying a 23 inch Asus around 200dollars. Will my fps drop a lot with the upgrade? Thank you :]
Size of a monitor doesn't mean anything. It's the resolution that matters.
If they're both Full HD, then your fps will be the same, if the resolution of the 23" is higher, then your fps will be lower than before.
This is ofcourse with both running at native resolution and same graphic settings.
I can't find any 23" Asus that ISN'T 1080p, and a 19" 1080p is rare. So making generalizations from whatever information you've given us, yes you will see an FPS drop :P
Either way I wouldn't recommend a 5570 for any kind of gaming, not even WoW unless it's at extremely low resolutions. 5570 is hardly a card.