Need help with Resolution?

Okay I have a GTS 450 and a 32 inch Vizio tv I am using the VGA right now and it works fine, but I just ordered an hdmi cable which will take my resolution from 1366 x 768 pixels to 1920 x 1080, so I am wondering if my graphics card can handle that let's say playing WoW, how will it run?

P.S. It ran great on my 22 inch computer monitor at 1650 x 1050.

Side-note 2gb of ram

My TV is 720p, but on the Vizio website it list this as the following,

Computer Support:1920 x 1080, 1024 x 768, 800 x 600, 640 x 480 via RGB/HDMI

Signal Compatibility:1080i, 720p, 480p, 480i

Native Panel Resolution:1366 x 768 pixels (Which is the highest it goes with the VGA)

Is there a noticeable difference between 1920 x 1080 1080i and standard 1366x768? Will my TV even work with the 1080i 1920 x 1080?

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