Crysis on ati 4770 at 1440x900 huge performance loss

i have oc'ed my 4770 to 1000/1020

on 1280x720 it get ~45 fps

when i set res to 1440x900 i get ~25

i can even play at 8x aa all very high @ 1280x720 with ~30 fps

why does fps drop that muchhhhh :??:
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More about crysis 4770 1440x900 huge performance loss
  1. How much VRAM does the card have? AA efficiency for the card is hugely dependent on VRAM, if it's too small than you'll take a huge performance impact, especially at 8x. Why don't you increase graphics quality instead of increasing AA?
  2. You have increased your resolution by 65%. that is the card is now filling a space 65% bigger than it was before. Its about right for that card. Dont know what your CPU is but i had a system with a 4770 and a 1440x900 screen and your numbers at that res and settings are very close to what i was getting. I used 4x AA and had some of the settings shadows for one turned down a bit.
    you will just have to play with it and see where your sweet spot is.

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